diff --git a/src/components/DismissibleAlert.tsx b/src/components/DismissibleAlert.tsx
index 679d9e5..f77cf57 100644
--- a/src/components/DismissibleAlert.tsx
+++ b/src/components/DismissibleAlert.tsx
@@ -1,4 +1,5 @@
 import { useEffect, useState, type ReactNode } from "react";
+import { createPortal } from "react-dom";
 import { X } from "lucide-react";
 
 type AlertTone = "success" | "info" | "warning" | "danger";
@@ -13,6 +14,26 @@ type DismissibleAlertProps = {
   resetKey?: string | number;
 };
 
+let floatingAlertRoot: HTMLElement | null = null;
+
+function getFloatingAlertRoot(): HTMLElement | null {
+  if (typeof document === "undefined") return null;
+  if (floatingAlertRoot?.isConnected) return floatingAlertRoot;
+
+  const existing = document.getElementById("app-floating-alerts");
+  if (existing) {
+    floatingAlertRoot = existing;
+    return floatingAlertRoot;
+  }
+
+  floatingAlertRoot = document.createElement("div");
+  floatingAlertRoot.id = "app-floating-alerts";
+  floatingAlertRoot.className = "alert-floating-stack";
+  floatingAlertRoot.setAttribute("aria-label", "Application notices");
+  document.body.appendChild(floatingAlertRoot);
+  return floatingAlertRoot;
+}
+
 export default function DismissibleAlert({
   tone = "info",
   children,
@@ -31,8 +52,7 @@ export default function DismissibleAlert({
   if (!visible) return null;
 
   const role = tone === "danger" || tone === "warning" ? "alert" : "status";
-
-  return (
+  const alert = (
     <div
       className={`alert ${tone}${compact ? " compact-alert" : ""}${floating ? " alert-floating" : ""} alert-dismissible ${className}`.trim()}
       role={role}
@@ -46,4 +66,8 @@ export default function DismissibleAlert({
       )}
     </div>
   );
+
+  if (!floating) return alert;
+  const root = getFloatingAlertRoot();
+  return root ? createPortal(alert, root) : alert;
 }
diff --git a/src/components/table/DataGrid.tsx b/src/components/table/DataGrid.tsx
index 95509cc..9ee149c 100644
--- a/src/components/table/DataGrid.tsx
+++ b/src/components/table/DataGrid.tsx
@@ -31,7 +31,7 @@ type DataGridState = {
   sort?: { columnId: string; direction: DataGridSortDirection };
   filters?: Record<string, string>;
   widths?: Record<string, number>;
-  fillColumnId?: string;
+  fillColumnId?: string | null;
 };
 
 type DataGridProps<T> = {
@@ -62,7 +62,7 @@ export default function DataGrid<T>({
   columns,
   getRowKey,
   emptyText = "No rows found.",
-  fit = "content",
+  fit = "container",
   className = "",
   rowClassName,
   storageKey
@@ -74,8 +74,9 @@ export default function DataGrid<T>({
     startX: number;
     startWidth: number;
     baseWidths: Record<string, number>;
-    fillColumnId?: string;
-    fillStartWidth?: number;
+    immediateRightColumnId?: string;
+    immediateRightStartWidth?: number;
+    shrinkRoomWithoutScroll: number;
   } | null>(null);
   const [openFilterColumnId, setOpenFilterColumnId] = useState<string | null>(null);
   const [filterPosition, setFilterPosition] = useState<FilterPosition | null>(null);
@@ -85,6 +86,13 @@ export default function DataGrid<T>({
   const filterPopoverRef = useRef<HTMLDivElement | null>(null);
   const [measuredWidths, setMeasuredWidths] = useState<Record<string, number>>({});
 
+  useEffect(() => {
+    // Repair persisted state from older resize implementations. Fixed columns
+    // never own user-resizable widths, and only a resizable, non-sticky column
+    // may be retained as the layout filler.
+    setState((current) => sanitizePersistedColumnState(columns, current));
+  }, [columns]);
+
   useEffect(() => {
     try {
       window.localStorage.setItem(localStorageKey, JSON.stringify(state));
@@ -141,40 +149,58 @@ export default function DataGrid<T>({
   useEffect(() => {
     if (!resizeState) return;
     const activeResize = resizeState;
+
     function onMove(event: MouseEvent) {
       const column = columns.find((item) => item.id === activeResize.columnId);
-      const minWidth = column?.minWidth ?? 80;
-      const maxWidth = column?.maxWidth ?? 2000;
-      const rawDelta = event.clientX - activeResize.startX;
-      const fillColumn = activeResize.fillColumnId
-        ? columns.find((item) => item.id === activeResize.fillColumnId)
-        : undefined;
-      const nextWidths = { ...activeResize.baseWidths };
+      if (!column) return;
 
-      if (fillColumn && fillColumn.id !== activeResize.columnId) {
-        const fillMinWidth = fillColumn.minWidth ?? 80;
-        const fillMaxWidth = fillColumn.maxWidth ?? 2000;
-        const fillStartWidth = activeResize.fillStartWidth
-          ?? activeResize.baseWidths[fillColumn.id]
-          ?? columnPixelWidth(fillColumn, activeResize.baseWidths[fillColumn.id], measuredWidths[fillColumn.id]);
-        const minDelta = Math.max(minWidth - activeResize.startWidth, fillStartWidth - fillMaxWidth);
-        const maxDelta = Math.min(maxWidth - activeResize.startWidth, fillStartWidth - fillMinWidth);
-        const boundedDelta = Math.min(maxDelta, Math.max(minDelta, rawDelta));
-        nextWidths[activeResize.columnId] = activeResize.startWidth + boundedDelta;
-        nextWidths[fillColumn.id] = fillStartWidth - boundedDelta;
+      const minWidth = column.minWidth ?? 80;
+      const maxWidth = column.maxWidth ?? 2000;
+      const rawDelta = event.clientX - activeResize.startX;
+      const activeDelta = Math.min(
+        maxWidth - activeResize.startWidth,
+        Math.max(minWidth - activeResize.startWidth, rawDelta)
+      );
+      const nextWidths = { ...activeResize.baseWidths };
+      let fillColumnId: string | null | undefined;
+
+      if (activeDelta > 0 && activeResize.immediateRightColumnId) {
+        // A growing column may only shrink its immediate neighbour. Once that
+        // neighbour reaches its minimum, the grid grows and can scroll rather
+        // than pulling space from a more distant column.
+        const neighbour = columns.find((item) => item.id === activeResize.immediateRightColumnId);
+        const neighbourStartWidth = activeResize.immediateRightStartWidth ?? 0;
+        const neighbourMinWidth = neighbour?.minWidth ?? 80;
+        const absorbedDelta = Math.min(activeDelta, Math.max(0, neighbourStartWidth - neighbourMinWidth));
+        nextWidths[activeResize.columnId] = activeResize.startWidth + activeDelta;
+        nextWidths[activeResize.immediateRightColumnId] = neighbourStartWidth - absorbedDelta;
+        fillColumnId = activeResize.immediateRightColumnId;
       } else {
-        nextWidths[activeResize.columnId] = Math.min(maxWidth, Math.max(minWidth, activeResize.startWidth + rawDelta));
+        // Shrinking never resizes another column. It consumes only horizontal
+        // overflow that is still available to the right of the viewport. Once
+        // that room is exhausted, resizing stops instead of growing a buffer
+        // column, reclaiming width from the left, or shifting the scroll view.
+        const boundedDelta = activeDelta < 0
+          ? Math.max(activeDelta, -activeResize.shrinkRoomWithoutScroll)
+          : activeDelta;
+        nextWidths[activeResize.columnId] = activeResize.startWidth + boundedDelta;
+        // Exact pixel tracks remain fixed during the drag, so no implicit
+        // flexible filler can change a different column behind the pointer.
+        fillColumnId = null;
       }
 
       setState((current) => ({
         ...current,
         widths: nextWidths,
-        fillColumnId: activeResize.fillColumnId
+        fillColumnId
       }));
     }
+
     function onUp() {
+      setState((current) => sanitizePersistedColumnState(columns, current));
       setResizeState(null);
     }
+
     window.addEventListener("mousemove", onMove);
     window.addEventListener("mouseup", onUp);
     return () => {
@@ -246,7 +272,16 @@ export default function DataGrid<T>({
     });
   }, [rows, columns, state.filters, state.sort, filterTypes]);
 
-  const stretchedColumnIds = useMemo(() => chooseStretchedColumns(columns, state.widths, state.fillColumnId), [columns, state.widths, state.fillColumnId]);
+  const stretchedColumnIds = useMemo(
+    () => chooseStretchedColumns(
+      columns,
+      state.widths,
+      state.fillColumnId,
+      fit,
+      Boolean(resizeState && !state.fillColumnId)
+    ),
+    [columns, state.widths, state.fillColumnId, fit, resizeState]
+  );
   const templateColumns = columns.map((column) => widthForColumn(column, state.widths?.[column.id], stretchedColumnIds.has(column.id))).join(" ");
   const hasFlexibleColumns = columns.some((column) => stretchedColumnIds.has(column.id) || isFlexibleColumn(column, state.widths?.[column.id]));
   const stickyOffsets = useMemo(() => computeStickyOffsets(columns, state.widths, measuredWidths), [columns, state.widths, measuredWidths]);
@@ -335,19 +370,29 @@ export default function DataGrid<T>({
                     event.stopPropagation();
                     const baseWidths = measuredColumnWidths(columns, headerCellRefs.current, state.widths, measuredWidths);
                     const currentWidth = baseWidths[column.id] ?? columnPixelWidth(column, state.widths?.[column.id], measuredWidths[column.id]);
-                    const fillColumnId = chooseResizeFillColumn(columns, column.id);
-                    const fillColumn = fillColumnId ? columns.find((item) => item.id === fillColumnId) : undefined;
-                    const fillStartWidth = fillColumn
-                      ? baseWidths[fillColumn.id] ?? columnPixelWidth(fillColumn, state.widths?.[fillColumn.id], measuredWidths[fillColumn.id])
+                    const immediateRightColumn = chooseImmediateResizePartner(columns, column.id);
+                    const immediateRightStartWidth = immediateRightColumn
+                      ? baseWidths[immediateRightColumn.id] ?? columnPixelWidth(immediateRightColumn, state.widths?.[immediateRightColumn.id], measuredWidths[immediateRightColumn.id])
                       : undefined;
-                    setState((current) => ({ ...current, widths: { ...baseWidths }, fillColumnId }));
+                    const gridElement = gridRef.current;
+                    const shrinkRoomWithoutScroll = gridElement
+                      ? Math.max(0, gridElement.scrollWidth - gridElement.clientWidth - gridElement.scrollLeft)
+                      : 0;
+                    setState((current) => ({
+                      ...current,
+                      widths: { ...baseWidths },
+                      // Exact measured tracks remain stable during the drag.
+                      // No flexible column is allowed to become an implicit partner.
+                      fillColumnId: undefined
+                    }));
                     setResizeState({
                       columnId: column.id,
                       startX: event.clientX,
                       startWidth: currentWidth,
                       baseWidths,
-                      fillColumnId,
-                      fillStartWidth
+                      immediateRightColumnId: immediateRightColumn?.id,
+                      immediateRightStartWidth,
+                      shrinkRoomWithoutScroll
                     });
                   }}
                 >
@@ -486,6 +531,25 @@ function loadState(key: string): DataGridState {
   }
 }
 
+function sanitizePersistedColumnState<T>(columns: DataGridColumn<T>[], state: DataGridState): DataGridState {
+  const resizableColumnIds = new Set(columns.filter((column) => column.resizable).map((column) => column.id));
+  const nextWidths = Object.fromEntries(
+    Object.entries(state.widths ?? {}).filter(([columnId]) => resizableColumnIds.has(columnId))
+  );
+  const fillColumn = state.fillColumnId
+    ? columns.find((column) => column.id === state.fillColumnId)
+    : undefined;
+  const nextFillColumnId = fillColumn?.resizable && !fillColumn.sticky ? fillColumn.id : undefined;
+  const widthsChanged = Object.keys(nextWidths).length !== Object.keys(state.widths ?? {}).length;
+  const fillChanged = nextFillColumnId !== state.fillColumnId;
+  if (!widthsChanged && !fillChanged) return state;
+  return {
+    ...state,
+    widths: Object.keys(nextWidths).length > 0 ? nextWidths : undefined,
+    fillColumnId: nextFillColumnId
+  };
+}
+
 function widthForColumn<T>(column: DataGridColumn<T>, savedWidth?: number, stretch = false): string {
   if (stretch) {
     const baseWidth = savedWidth ?? fixedWidthFloor(column);
@@ -497,59 +561,54 @@ function widthForColumn<T>(column: DataGridColumn<T>, savedWidth?: number, stret
   return `minmax(${column.minWidth ?? 140}px, 1fr)`;
 }
 
-function chooseStretchedColumns<T>(columns: DataGridColumn<T>[], savedWidths?: Record<string, number>, fillColumnId?: string): Set<string> {
-  if (columns.length === 0) return new Set();
+function chooseStretchedColumns<T>(
+  columns: DataGridColumn<T>[],
+  savedWidths?: Record<string, number>,
+  fillColumnId?: string | null,
+  fit: "content" | "container" = "container",
+  suppressFallbackFill = false
+): Set<string> {
+  if (fit === "content" || columns.length === 0 || fillColumnId === null) return new Set();
 
   const savedColumnIds = new Set(Object.keys(savedWidths ?? {}));
+  if (suppressFallbackFill && savedColumnIds.size > 0 && !fillColumnId) return new Set();
   if (savedColumnIds.size > 0) {
-    const preferredFillColumnId = chooseResizeFillColumn(columns);
-    if (fillColumnId && fillColumnId === preferredFillColumnId && columns.some((column) => column.id === fillColumnId)) {
-      return new Set([fillColumnId]);
-    }
+    const requestedFill = columns.find((column) => column.id === fillColumnId && !column.sticky);
+    if (requestedFill) return new Set([requestedFill.id]);
 
     const unsizedNonStickyResizable = columns.filter((column) => column.resizable && !column.sticky && !savedColumnIds.has(column.id));
     if (unsizedNonStickyResizable.length > 0) return new Set(unsizedNonStickyResizable.map((column) => column.id));
 
-    const unsizedFlexible = columns.filter((column) => !savedColumnIds.has(column.id) && isFlexibleColumn(column, savedWidths?.[column.id]));
+    const unsizedFlexible = columns.filter((column) => !column.sticky && !savedColumnIds.has(column.id) && isFlexibleColumn(column, savedWidths?.[column.id]));
     if (unsizedFlexible.length > 0) return new Set(unsizedFlexible.map((column) => column.id));
 
-    const fallback = chooseResizeFillColumn(columns);
+    const fallback = chooseLayoutFillColumn(columns);
     return new Set(fallback ? [fallback] : []);
   }
 
   const nonStickyResizable = columns.filter((column) => column.resizable && !column.sticky);
   if (nonStickyResizable.length > 0) return new Set(nonStickyResizable.map((column) => column.id));
 
-  const flexible = columns.filter((column) => isFlexibleColumn(column, savedWidths?.[column.id]));
-  if (flexible.length > 0) return new Set();
+  const flexible = columns.filter((column) => !column.sticky && isFlexibleColumn(column, savedWidths?.[column.id]));
+  if (flexible.length > 0) return new Set(flexible.map((column) => column.id));
 
-  const fallback = chooseResizeFillColumn(columns);
+  // Fixed-width tables still fill their container by default. Prefer the last
+  // ordinary data column so sticky action columns remain visually stable.
+  const fallback = chooseLayoutFillColumn(columns);
   return new Set(fallback ? [fallback] : []);
 }
 
-function chooseResizeFillColumn<T>(columns: DataGridColumn<T>[], activeColumnId?: string): string | undefined {
-  const activeIndex = activeColumnId ? columns.findIndex((column) => column.id === activeColumnId) : -1;
-  const candidateColumns = activeIndex >= 0 ? columns.slice(activeIndex + 1) : columns;
+function chooseLayoutFillColumn<T>(columns: DataGridColumn<T>[]): string | undefined {
+  const nonSticky = columns.filter((column) => !column.sticky);
+  const resizable = nonSticky.filter((column) => column.resizable);
+  return (resizable[resizable.length - 1] ?? nonSticky[nonSticky.length - 1])?.id;
+}
 
-  // Only resizable, non-sticky columns are allowed to absorb spare width. This keeps
-  // fixed/action columns fixed. During active resize the absorber must be to the right
-  // of the dragged column, so columns on the left never move. If there is no eligible
-  // column to the right, the dragged column itself may stay stretched; otherwise no
-  // absorber is selected and the grid may grow/shrink naturally.
-  const rightmostResizableNonSticky = (items: DataGridColumn<T>[]) => {
-    const candidates = items.filter((column) => column.resizable && !column.sticky);
-    return candidates[candidates.length - 1];
-  };
-
-  const rightFillColumn = rightmostResizableNonSticky(candidateColumns);
-  if (rightFillColumn) return rightFillColumn.id;
-
-  if (activeIndex >= 0) {
-    const activeColumn = columns[activeIndex];
-    if (activeColumn?.resizable && !activeColumn.sticky) return activeColumn.id;
-  }
-
-  return undefined;
+function chooseImmediateResizePartner<T>(columns: DataGridColumn<T>[], activeColumnId: string): DataGridColumn<T> | undefined {
+  const activeIndex = columns.findIndex((column) => column.id === activeColumnId);
+  if (activeIndex < 0) return undefined;
+  const neighbour = columns[activeIndex + 1];
+  return neighbour?.resizable && !neighbour.sticky ? neighbour : undefined;
 }
 
 function measuredColumnWidths<T>(
diff --git a/src/features/auth/LoginModal.tsx b/src/features/auth/LoginModal.tsx
index c367ddf..e6ad8ce 100644
--- a/src/features/auth/LoginModal.tsx
+++ b/src/features/auth/LoginModal.tsx
@@ -3,6 +3,7 @@ import type { ApiSettings, LoginResponse } from "../../types";
 import { login } from "../../api/auth";
 import Button from "../../components/Button";
 import FormField from "../../components/FormField";
+import DismissibleAlert from "../../components/DismissibleAlert";
 
 export default function LoginModal({
   settings,
@@ -42,7 +43,7 @@ export default function LoginModal({
         </header>
         <div className="modal-body form-grid">
           <div className="login-hint">Development default: user <strong>admin@example.local</strong>, password <strong>dev-admin</strong>.</div>
-          {error && <div className="alert danger">{error}</div>}
+          {error && <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert>}
           <FormField label="Email">
             <input type="email" value={email} onChange={(e) => setEmail(e.target.value)} />
           </FormField>
diff --git a/src/features/campaigns/AttachmentsDataPage.tsx b/src/features/campaigns/AttachmentsDataPage.tsx
index b4c9a50..b1ef58e 100644
--- a/src/features/campaigns/AttachmentsDataPage.tsx
+++ b/src/features/campaigns/AttachmentsDataPage.tsx
@@ -86,8 +86,8 @@ export default function AttachmentsDataPage({ settings, campaignId }: { settings
         </div>
       </div>
 
-      {error && <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert>}
-      {localError && <DismissibleAlert tone="danger" resetKey={localError}>{localError}</DismissibleAlert>}
+      {error && <DismissibleAlert tone="danger" resetKey={error} floating>{error}</DismissibleAlert>}
+      {localError && <DismissibleAlert tone="danger" resetKey={localError} floating>{localError}</DismissibleAlert>}
       {locked && <LockedVersionNotice settings={settings} campaignId={campaignId} version={version} reload={reload} message="Create an editable copy before changing attachments." />}
 
       <LoadingFrame loading={loading || !draft} label="Loading campaign draft…">
diff --git a/src/features/campaigns/CampaignAuditPage.tsx b/src/features/campaigns/CampaignAuditPage.tsx
index 62cca0a..e18cf33 100644
--- a/src/features/campaigns/CampaignAuditPage.tsx
+++ b/src/features/campaigns/CampaignAuditPage.tsx
@@ -23,7 +23,7 @@ export default function CampaignAuditPage({ settings, campaignId }: { settings:
         </div>
       </div>
 
-      {error && <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert>}
+      {error && <DismissibleAlert tone="danger" resetKey={error} floating>{error}</DismissibleAlert>}
 
       <LoadingFrame loading={loading} label="Loading audit data…">
       <Card title="Recent audit events">
diff --git a/src/features/campaigns/CampaignFieldsPage.tsx b/src/features/campaigns/CampaignFieldsPage.tsx
index a2f80c3..7e3954d 100644
--- a/src/features/campaigns/CampaignFieldsPage.tsx
+++ b/src/features/campaigns/CampaignFieldsPage.tsx
@@ -156,9 +156,9 @@ export default function CampaignFieldsPage({ settings, campaignId }: { settings:
         </div>
       </div>
 
-      {error && <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert>}
-      {localError && <DismissibleAlert tone="danger" resetKey={localError}>{localError}</DismissibleAlert>}
-      {fieldNameWarning && <DismissibleAlert tone="warning" resetKey={fieldNameWarning}>{fieldNameWarning}</DismissibleAlert>}
+      {error && <DismissibleAlert tone="danger" resetKey={error} floating>{error}</DismissibleAlert>}
+      {localError && <DismissibleAlert tone="danger" resetKey={localError} floating>{localError}</DismissibleAlert>}
+      {fieldNameWarning && <DismissibleAlert tone="warning" resetKey={fieldNameWarning} floating>{fieldNameWarning}</DismissibleAlert>}
       {locked && <LockedVersionNotice settings={settings} campaignId={campaignId} version={version} reload={reload} message="Create an editable copy before changing fields." />}
 
       <LoadingFrame loading={loading || !draft} label="Loading campaign draft…">
diff --git a/src/features/campaigns/CampaignJsonView.tsx b/src/features/campaigns/CampaignJsonView.tsx
index a9c1891..a98bf72 100644
--- a/src/features/campaigns/CampaignJsonView.tsx
+++ b/src/features/campaigns/CampaignJsonView.tsx
@@ -28,7 +28,7 @@ export default function CampaignJsonView({ settings, campaignId }: { settings: A
           <Button onClick={() => downloadJson(filename, campaignJson)} disabled={!version}>Download JSON</Button>
         </div>
       </div>
-      {error && <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert>}
+      {error && <DismissibleAlert tone="danger" resetKey={error} floating>{error}</DismissibleAlert>}
       <LoadingFrame loading={loading} label="Loading JSON…">
       <Card>
         {!loading || version ? <pre className="code-panel">{JSON.stringify(campaignJson, null, 2)}</pre> : <pre className="code-panel">{"{}"}</pre>}
diff --git a/src/features/campaigns/CampaignListPage.tsx b/src/features/campaigns/CampaignListPage.tsx
index 0effb18..e4c1195 100644
--- a/src/features/campaigns/CampaignListPage.tsx
+++ b/src/features/campaigns/CampaignListPage.tsx
@@ -115,7 +115,7 @@ export default function CampaignListPage({ settings }: { settings: ApiSettings }
         <DismissibleAlert tone="warning">Sign in with your user account or configure an automation API key under Settings to load campaigns.</DismissibleAlert>
       )}
 
-      {error && <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert>}
+      {error && <DismissibleAlert tone="danger" resetKey={error} floating>{error}</DismissibleAlert>}
 
       <div className="page-heading split workspace-heading">
         <div>
diff --git a/src/features/campaigns/CampaignOverviewPage.tsx b/src/features/campaigns/CampaignOverviewPage.tsx
index b182e98..3abd381 100644
--- a/src/features/campaigns/CampaignOverviewPage.tsx
+++ b/src/features/campaigns/CampaignOverviewPage.tsx
@@ -96,8 +96,8 @@ export default function CampaignOverviewPage({ settings, campaignId }: { setting
         </div>
       </div>
 
-      {error && <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert>}
-      {message && <DismissibleAlert tone="success" resetKey={message}>{message}</DismissibleAlert>}
+      {error && <DismissibleAlert tone="danger" resetKey={error} floating>{error}</DismissibleAlert>}
+      {message && <DismissibleAlert tone="success" resetKey={message} floating>{message}</DismissibleAlert>}
 
       <LoadingFrame loading={loading} label="Loading campaign overview…">
         <Card title="Campaign identity">
diff --git a/src/features/campaigns/CampaignReportPage.tsx b/src/features/campaigns/CampaignReportPage.tsx
index 4509393..dfdf36b 100644
--- a/src/features/campaigns/CampaignReportPage.tsx
+++ b/src/features/campaigns/CampaignReportPage.tsx
@@ -24,7 +24,7 @@ export default function CampaignReportPage({ settings, campaignId }: { settings:
           <Button onClick={reload} disabled={loading}>Reload</Button>
         </div>
       </div>
-      {error && <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert>}
+      {error && <DismissibleAlert tone="danger" resetKey={error} floating>{error}</DismissibleAlert>}
       <LoadingFrame loading={loading} label="Loading report data…">
       <div className="dashboard-grid">
         <Card title="Report summary">
diff --git a/src/features/campaigns/GlobalSettingsPage.tsx b/src/features/campaigns/GlobalSettingsPage.tsx
index af7d832..84835ec 100644
--- a/src/features/campaigns/GlobalSettingsPage.tsx
+++ b/src/features/campaigns/GlobalSettingsPage.tsx
@@ -68,8 +68,8 @@ export default function GlobalSettingsPage({ settings, campaignId }: { settings:
         </div>
       </div>
 
-      {error && <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert>}
-      {localError && <DismissibleAlert tone="danger" resetKey={localError}>{localError}</DismissibleAlert>}
+      {error && <DismissibleAlert tone="danger" resetKey={error} floating>{error}</DismissibleAlert>}
+      {localError && <DismissibleAlert tone="danger" resetKey={localError} floating>{localError}</DismissibleAlert>}
       {locked && <LockedVersionNotice settings={settings} campaignId={campaignId} version={version} reload={reload} message="Create an editable copy before changing global settings." />}
 
       <LoadingFrame loading={loading || !draft} label="Loading campaign draft…">
diff --git a/src/features/campaigns/MailSettingsPage.tsx b/src/features/campaigns/MailSettingsPage.tsx
index ecb4f00..294cea3 100644
--- a/src/features/campaigns/MailSettingsPage.tsx
+++ b/src/features/campaigns/MailSettingsPage.tsx
@@ -261,8 +261,8 @@ export default function MailSettingsPage({ settings, campaignId }: { settings: A
         </div>
       </div>
 
-      {error && <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert>}
-      {localError && <DismissibleAlert tone="danger" resetKey={localError}>{localError}</DismissibleAlert>}
+      {error && <DismissibleAlert tone="danger" resetKey={error} floating>{error}</DismissibleAlert>}
+      {localError && <DismissibleAlert tone="danger" resetKey={localError} floating>{localError}</DismissibleAlert>}
       {locked && <LockedVersionNotice settings={settings} campaignId={campaignId} version={version} reload={reload} message="Create an editable copy before changing server settings." />}
 
       <LoadingFrame loading={loading || !draft} label="Loading campaign draft…">
@@ -331,7 +331,7 @@ export default function MailSettingsPage({ settings, campaignId }: { settings: A
                 <Button variant="danger" onClick={clearMockMailbox} disabled={mailActionState === "mock" || mockMessages.length === 0}>Clear</Button>
               </div>
             </div>
-            {mockError && <DismissibleAlert tone="danger" resetKey={mockError}>{mockError}</DismissibleAlert>}
+            {mockError && <DismissibleAlert tone="danger" resetKey={mockError} floating>{mockError}</DismissibleAlert>}
             <DataGrid
               id={`campaign-${campaignId}-server-mock-mailbox`}
               rows={mockMessages}
@@ -411,23 +411,23 @@ function MailActionResult({ result }: { result: MailConnectionTestResponse | nul
   if (!result) return null;
   const authenticated = result.details?.authenticated;
   return (
-    <div className={`alert ${result.ok ? "success" : "danger"}`}>
+    <DismissibleAlert tone={result.ok ? "success" : "danger"} resetKey={`${result.ok}:${result.message}`}>
       {result.message}
       {result.ok && typeof authenticated === "boolean" && (
         <span> Authentication: {authenticated ? "credentials accepted" : "not used"}.</span>
       )}
-    </div>
+    </DismissibleAlert>
   );
 }
 
 function FolderLookupResult({ result, disabled, onUseDetected }: { result: MailImapFolderListResponse | null; disabled?: boolean; onUseDetected: () => void }) {
   if (!result) return null;
   if (!result.ok) {
-    return <div className="alert danger">{result.message}</div>;
+    return <DismissibleAlert tone="danger" resetKey={result.message}>{result.message}</DismissibleAlert>;
   }
 
   return (
-    <div className="alert success">
+    <DismissibleAlert tone="success" resetKey={`${result.message}:${result.detected_sent_folder || ""}`}>
       <p>{result.message}</p>
       <p>Detected Sent folder: <strong>{result.detected_sent_folder || "—"}</strong></p>
       {result.detected_sent_folder && <Button onClick={onUseDetected} disabled={disabled}>Use detected folder</Button>}
@@ -439,6 +439,6 @@ function FolderLookupResult({ result, disabled, onUseDetected }: { result: MailI
           {result.folders.length > 12 && <span className="field-chip">+{result.folders.length - 12} more</span>}
         </div>
       )}
-    </div>
+    </DismissibleAlert>
   );
 }
\ No newline at end of file
diff --git a/src/features/campaigns/RecipientDataPage.tsx b/src/features/campaigns/RecipientDataPage.tsx
index 961bf75..6572df1 100644
--- a/src/features/campaigns/RecipientDataPage.tsx
+++ b/src/features/campaigns/RecipientDataPage.tsx
@@ -136,8 +136,8 @@ export default function RecipientDataPage({ settings, campaignId }: { settings:
         </div>
       </div>
 
-      {error && <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert>}
-      {localError && <DismissibleAlert tone="danger" resetKey={localError}>{localError}</DismissibleAlert>}
+      {error && <DismissibleAlert tone="danger" resetKey={error} floating>{error}</DismissibleAlert>}
+      {localError && <DismissibleAlert tone="danger" resetKey={localError} floating>{localError}</DismissibleAlert>}
       {locked && <LockedVersionNotice settings={settings} campaignId={campaignId} version={version} reload={reload} message="Create an editable copy before changing sender or recipient profiles." />}
 
       <LoadingFrame loading={loading || !draft} label="Loading campaign draft…">
diff --git a/src/features/campaigns/RecipientDetailsPage.tsx b/src/features/campaigns/RecipientDetailsPage.tsx
index 17657af..8204948 100644
--- a/src/features/campaigns/RecipientDetailsPage.tsx
+++ b/src/features/campaigns/RecipientDetailsPage.tsx
@@ -81,8 +81,8 @@ export default function RecipientDetailsPage({ settings, campaignId }: { setting
         </div>
       </div>
 
-      {error && <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert>}
-      {localError && <DismissibleAlert tone="danger" resetKey={localError}>{localError}</DismissibleAlert>}
+      {error && <DismissibleAlert tone="danger" resetKey={error} floating>{error}</DismissibleAlert>}
+      {localError && <DismissibleAlert tone="danger" resetKey={localError} floating>{localError}</DismissibleAlert>}
       {locked && <LockedVersionNotice settings={settings} campaignId={campaignId} version={version} reload={reload} message="Create an editable copy before changing recipient data." />}
 
       <LoadingFrame loading={loading || !draft} label="Loading campaign draft…">
diff --git a/src/features/campaigns/SendDataPage.tsx b/src/features/campaigns/SendDataPage.tsx
index f2422b3..7b747bb 100644
--- a/src/features/campaigns/SendDataPage.tsx
+++ b/src/features/campaigns/SendDataPage.tsx
@@ -148,9 +148,9 @@ export default function SendDataPage({ settings, campaignId }: { settings: ApiSe
         </div>
       </div>
 
-      {error && <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert>}
-      {sendMessage && <DismissibleAlert tone="info" resetKey={sendMessage}>{sendMessage}</DismissibleAlert>}
-      {mockMessage && <DismissibleAlert tone="info" resetKey={mockMessage}>{mockMessage}</DismissibleAlert>}
+      {error && <DismissibleAlert tone="danger" resetKey={error} floating>{error}</DismissibleAlert>}
+      {sendMessage && <DismissibleAlert tone="info" resetKey={sendMessage} floating>{sendMessage}</DismissibleAlert>}
+      {mockMessage && <DismissibleAlert tone="info" resetKey={mockMessage} floating>{mockMessage}</DismissibleAlert>}
       {locked && <LockedVersionNotice settings={settings} campaignId={campaignId} version={version} reload={reload} message="Send snapshot. Copy to edit." />}
 
       <LoadingFrame loading={loading || queuedOrSending} label={queuedOrSending ? "Refreshing send state…" : "Loading send data…"}>
diff --git a/src/features/campaigns/TemplateDataPage.tsx b/src/features/campaigns/TemplateDataPage.tsx
index 0daab5a..e77b2f6 100644
--- a/src/features/campaigns/TemplateDataPage.tsx
+++ b/src/features/campaigns/TemplateDataPage.tsx
@@ -142,8 +142,8 @@ export default function TemplateDataPage({ settings, campaignId }: { settings: A
         </div>
       </div>
 
-      {error && <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert>}
-      {localError && <DismissibleAlert tone="danger" resetKey={localError}>{localError}</DismissibleAlert>}
+      {error && <DismissibleAlert tone="danger" resetKey={error} floating>{error}</DismissibleAlert>}
+      {localError && <DismissibleAlert tone="danger" resetKey={localError} floating>{localError}</DismissibleAlert>}
       {locked && <LockedVersionNotice settings={settings} campaignId={campaignId} version={version} reload={reload} message="Create an editable copy before changing the template." />}
 
       <LoadingFrame loading={loading || !draft} label="Loading campaign draft…">
diff --git a/src/features/campaigns/components/ReviewWorkflowCards.tsx b/src/features/campaigns/components/ReviewWorkflowCards.tsx
index 50528d0..1341561 100644
--- a/src/features/campaigns/components/ReviewWorkflowCards.tsx
+++ b/src/features/campaigns/components/ReviewWorkflowCards.tsx
@@ -107,7 +107,7 @@ export default function ReviewWorkflowCards({
 
   return (
     <>
-      {actionMessage && <DismissibleAlert tone="info" resetKey={actionMessage}>{actionMessage}</DismissibleAlert>}
+      {actionMessage && <DismissibleAlert tone="info" resetKey={actionMessage} floating>{actionMessage}</DismissibleAlert>}
 
       <Card
         title="Review actions"
diff --git a/src/features/campaigns/context/UnsavedChangesContext.tsx b/src/features/campaigns/context/UnsavedChangesContext.tsx
index c35952e..e1e8cd9 100644
--- a/src/features/campaigns/context/UnsavedChangesContext.tsx
+++ b/src/features/campaigns/context/UnsavedChangesContext.tsx
@@ -1,6 +1,7 @@
 import { createContext, useCallback, useContext, useEffect, useMemo, useRef, useState, type ReactNode } from "react";
 import { useNavigate } from "react-router-dom";
 import Button from "../../../components/Button";
+import DismissibleAlert from "../../../components/DismissibleAlert";
 
 type NavigationAction = () => void;
 
@@ -146,7 +147,7 @@ export function CampaignUnsavedChangesProvider({ children }: { children: ReactNo
             </header>
             <div className="modal-body">
               <p>{registration.message ?? "This campaign page has unsaved changes. Save them before leaving, or discard the changes and continue."}</p>
-              {saveError && <div className="alert danger">{saveError}</div>}
+              {saveError && <DismissibleAlert tone="danger" resetKey={saveError}>{saveError}</DismissibleAlert>}
             </div>
             <footer className="modal-footer unsaved-changes-actions">
               <Button onClick={() => setPendingAction(null)} disabled={saving}>Cancel</Button>
diff --git a/src/features/campaigns/wizard/CreateWizard.tsx b/src/features/campaigns/wizard/CreateWizard.tsx
index a76694f..a614abc 100644
--- a/src/features/campaigns/wizard/CreateWizard.tsx
+++ b/src/features/campaigns/wizard/CreateWizard.tsx
@@ -117,8 +117,8 @@ export default function CreateWizard({ settings, campaignId }: { settings: ApiSe
             </div>
             <div className="save-state">{saveState}</div>
           </div>
-          {localError && <DismissibleAlert tone="danger" resetKey={localError}>{localError}</DismissibleAlert>}
-          {validationMessage && <DismissibleAlert tone="info" resetKey={validationMessage}>{validationMessage}</DismissibleAlert>}
+          {localError && <DismissibleAlert tone="danger" resetKey={localError} floating>{localError}</DismissibleAlert>}
+          {validationMessage && <DismissibleAlert tone="info" resetKey={validationMessage} floating>{validationMessage}</DismissibleAlert>}
           <Card>
             {draft && activeStep === "basics" && <BasicsStep draft={draft} patch={patch} />}
             {draft && activeStep === "sender" && <SenderStep draft={draft} patch={patch} />}
diff --git a/src/features/files/FilesPage.tsx b/src/features/files/FilesPage.tsx
index d21069f..40a918f 100644
--- a/src/features/files/FilesPage.tsx
+++ b/src/features/files/FilesPage.tsx
@@ -1102,6 +1102,8 @@ export default function FilesPage({ settings }: { settings: ApiSettings }) {
     return `${label} ${sortDirection === "asc" ? "↑" : "↓"}`;
   }
 
+  const noticeTone = message.startsWith("No files") ? "warning" : message.endsWith("…") ? "info" : "success";
+
   const toolbar = (
     <div className="file-manager-toolbar" aria-label="File actions">
       <Button variant="primary" onClick={() => openDialog("upload", toolbarTarget())} disabled={busy || !activeSpace}><UploadCloud size={16} aria-hidden="true" /> Upload</Button>
@@ -1119,6 +1121,9 @@ export default function FilesPage({ settings }: { settings: ApiSettings }) {
       {error && (
         <DismissibleAlert tone="danger" resetKey={error} floating>{error}</DismissibleAlert>
       )}
+      {message && !error && (
+        <DismissibleAlert tone={noticeTone} resetKey={message} floating>{message}</DismissibleAlert>
+      )}
 
       <div className={`file-manager-shell ${busy ? "is-loading" : ""}`}>
         <aside className="file-tree-panel" aria-label="File spaces and folders">
diff --git a/src/features/settings/SettingsPage.tsx b/src/features/settings/SettingsPage.tsx
index a708891..a5e325a 100644
--- a/src/features/settings/SettingsPage.tsx
+++ b/src/features/settings/SettingsPage.tsx
@@ -7,6 +7,7 @@ import PageTitle from "../../components/PageTitle";
 import ToggleSwitch from "../../components/ToggleSwitch";
 import { apiFetch } from "../../api/client";
 import ModuleSubnav, { type ModuleSubnavGroup } from "../../layout/ModuleSubnav";
+import DismissibleAlert from "../../components/DismissibleAlert";
 
 type SettingsSection = "interface" | "workspace" | "local-connection" | "notifications";
 
@@ -134,7 +135,7 @@ export default function SettingsPage({ settings, onSettingsChange }: { settings:
                   <div className="button-row compact-actions">
                     <Button variant="primary" onClick={testConnection} disabled={testing}>{testing ? "Testing…" : "Test connection"}</Button>
                   </div>
-                  {testResult && <div className={`alert ${testResult.startsWith("Connection successful") ? "success" : "warning"}`}>{testResult}</div>}
+                  {testResult && <DismissibleAlert tone={testResult.startsWith("Connection successful") ? "success" : "warning"} resetKey={testResult}>{testResult}</DismissibleAlert>}
                 </div>
               </Card>
               <Card title="Session state">
diff --git a/src/styles/components.css b/src/styles/components.css
index bc74b5a..502dc91 100644
--- a/src/styles/components.css
+++ b/src/styles/components.css
@@ -693,9 +693,7 @@
   align-items: flex-start;
   justify-content: space-between;
   gap: 12px;
-  position: sticky;
-  top: 10px;
-  z-index: 30;
+  position: relative;
   box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
 }
 
@@ -704,17 +702,27 @@
   flex: 1 1 auto;
 }
 
-.alert-floating {
+.alert-floating-stack {
   position: fixed;
   top: 131px;
   left: 50%;
   z-index: 1200;
+  display: grid;
+  gap: 10px;
   width: min(640px, calc(100vw - 32px));
-  margin: 0;
   transform: translateX(-50%);
+  pointer-events: none;
+}
+
+.alert-floating {
+  position: relative;
+  top: auto;
+  width: 100%;
+  margin: 0;
   border: 1px solid rgba(15, 23, 42, 0.14);
   border-radius: 12px;
   box-shadow: 0 16px 38px rgba(15, 23, 42, 0.2);
+  pointer-events: auto;
 }
 
 .alert-dismiss {