feat: add temporal context and contextual help

webui/src/styles/layout.css

@@ -28,17 +28,8 @@
 .icon-rail.compact { width: 58px; }
 .app-main { min-width: 0; min-height: 0; height: 100vh; display: grid; grid-template-rows: 64px 51px minmax(0, 1fr); }
 .titlebar { position: relative; background: var(--titlebar-bg); border-bottom: var(--border-line); display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; padding: 0 18px; gap: 18px; z-index: 100; box-shadow: var(--shadow-chrome); }
-.titlebar.is-maintenance { background: var(--warning-bg); border-bottom-color: var(--warning-border-soft); }
-.titlebar.is-offline { background: var(--danger-bg); border-bottom-color: var(--danger-border-deep); }
-.titlebar > :not(.titlebar-status-pattern) { position: relative; z-index: 1; }
-.titlebar-status-pattern { position: absolute; inset: 0; display: flex; align-items: center; gap: 34px; overflow: hidden; padding: 0 14px; pointer-events: none; white-space: nowrap; }
-.titlebar-status-pattern span { flex: 0 0 auto; color: var(--warning-text); font-size: 11px; font-weight: 800; opacity: .16; }
-.titlebar.is-offline .titlebar-status-pattern span { color: var(--danger-text); opacity: .18; }
-.titlebar.has-global-search { grid-template-columns: minmax(0, 1fr) minmax(190px, min(360px, 28vw)) minmax(0, 1fr); }
 .titlebar-leading { grid-column: 1; display: flex; align-items: center; min-width: 0; }
-.titlebar-global-search { grid-column: 2; position: relative; width: 100%; min-width: 0; height: 34px; }
 .titlebar-actions { grid-column: 2; display: flex; align-items: center; justify-self: end; min-width: 0; gap: 10px; }
-.titlebar.has-global-search .titlebar-actions { grid-column: 3; }
 .titlebar-context-selectors { display: flex; align-items: center; min-width: 0; gap: 12px; }
 .acting-context-selector { display: inline-flex; align-items: center; min-width: 0; gap: 7px; color: var(--muted); }
 .acting-context-selector select { width: auto; max-width: 260px; min-height: 32px; border: 0; border-radius: var(--radius-sm); background: transparent; color: var(--text-strong); font: inherit; font-weight: 700; padding: 5px 24px 5px 8px; }
@@ -53,20 +44,31 @@
 .titlebar-link, .titlebar-icon-link, .account-pill { border: 0; background: transparent; display: inline-flex; align-items: center; gap: 7px; color: var(--muted); font: inherit; }
 .titlebar-icon-link { width: 34px; height: 34px; justify-content: center; border-radius: 4px; cursor: pointer; }
 .titlebar-icon-link:hover, .titlebar-link:hover { background: var(--titlebar-hover-bg); color: var(--text-strong); }
+.titlebar-icon-link.is-context-active { background: var(--accent-hover-bg); color: var(--accent); }
+.titlebar-icon-link.is-context-active:hover { background: color-mix(in srgb, var(--accent) 16%, transparent); color: var(--accent); }
 .titlebar-notification-button { position: relative; }
 .titlebar-notification-badge { position: absolute; top: 4px; right: 3px; min-width: 16px; height: 16px; box-sizing: border-box; display: inline-flex; align-items: center; justify-content: center; padding: 0 4px; border: 2px solid var(--titlebar-bg); border-radius: 999px; background: var(--red); color: var(--on-accent); font-size: 10px; font-weight: 800; line-height: 1; transform: translate(35%, -35%); }
 .account-pill { color: var(--text); }
 .maintenance-topbar-link,
-.backend-offline-topbar-alert { width: 34px; height: 34px; flex: 0 0 auto; box-sizing: border-box; border-radius: 4px; display: inline-flex; align-items: center; justify-content: center; margin-right: 8px; padding: 0; font: inherit; box-shadow: 0 1px 2px var(--hover-tint); }
-.maintenance-topbar-link { border: 1px solid var(--warning-border-soft); background: var(--surface); color: var(--warning-text); cursor: pointer; }
+.backend-offline-topbar-alert { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); min-height: 32px; max-width: min(560px, calc(100vw - 24px)); box-sizing: border-box; border-radius: 6px; display: inline-flex; align-items: center; justify-content: center; padding: 0 14px; overflow: hidden; font: inherit; font-weight: 800; text-overflow: ellipsis; white-space: nowrap; box-shadow: 0 1px 2px var(--hover-tint); z-index: 1; }
+.maintenance-topbar-link { border: 1px solid var(--warning-border-soft); background: var(--warning-bg); color: var(--warning-text); cursor: pointer; }
 .maintenance-topbar-link:hover { background: var(--warning-bg-hover); color: var(--warning-text-hover); }
-.backend-offline-topbar-alert { border: 1px solid var(--danger-border-deep); background: var(--surface); color: var(--danger-text); }
+.backend-offline-topbar-alert { border: 1px solid var(--danger-border-deep); background: var(--red); color: var(--on-accent); }
 .language-menu-button { min-width: 54px; justify-content: center; font-weight: 800; }
 .language-menu-code, .language-option-code { font-size: 12px; letter-spacing: .06em; text-transform: uppercase; }
 .language-menu { min-width: 210px; }
 .language-menu .dropdown-item { justify-content: flex-start; }
 .language-menu .dropdown-item svg { margin-left: auto; }
 .language-option-code { width: 34px; color: var(--muted); }
+.temporal-data-menu { width: min(360px, calc(100vw - 20px)); box-sizing: border-box; display: grid; gap: 12px; padding: 14px; }
+.temporal-data-menu-heading { display: flex; align-items: center; min-height: 24px; }
+.temporal-validity-control .segmented-control-option { padding-inline: 10px; }
+.temporal-recorded-section { display: grid; gap: 10px; padding-top: 12px; border-top: var(--border-line); }
+.temporal-data-menu .form-field { gap: 5px; }
+.temporal-data-menu input,
+.temporal-data-menu select { width: 100%; min-width: 0; box-sizing: border-box; }
+.temporal-data-explanation { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.45; }
+.temporal-data-menu-actions { display: flex; justify-content: flex-end; }
 .api-mini { display: flex; gap: 6px; }
 .api-mini input { width: 155px; height: 30px; border: var(--border-line); border-radius: var(--radius-sm); padding: 0 8px; }
 .breadcrumb-bar { background: var(--bar); border-bottom: var(--border-line-dark); display: flex; align-items: center; padding: 0 22px; box-shadow: var(--shadow-chrome); z-index: 90; }
@@ -219,7 +221,6 @@
 .code-panel { background: var(--code-bg); color: var(--code-text); padding: 18px; border-radius: 4px; overflow: auto; }
 @media (max-width: 900px) {
   .api-mini { display: none; }
-  .titlebar.has-global-search { grid-template-columns: minmax(0, 1fr) 34px auto; }
   .workspace { grid-template-columns: 1fr; }
   .section-sidebar { display: none; }
   .wizard-card { grid-template-columns: 1fr; }
@@ -344,9 +345,8 @@
     grid-template-rows: 104px 51px minmax(0, 1fr);
   }
 
-  .titlebar,
-  .titlebar.has-global-search {
-    grid-template-columns: 34px minmax(0, 1fr);
+  .titlebar {
+    grid-template-columns: minmax(0, 1fr);
     grid-template-rows: 42px 42px;
     column-gap: 6px;
     row-gap: 4px;
@@ -367,22 +367,12 @@
     scrollbar-width: thin;
   }
 
-  .titlebar-global-search {
+  .titlebar-actions {
     grid-column: 1;
     grid-row: 2;
-  }
-
-  .titlebar-actions,
-  .titlebar.has-global-search .titlebar-actions {
-    grid-column: 2;
-    grid-row: 2;
     gap: 2px;
   }
 
-  .titlebar:not(.has-global-search) .titlebar-actions {
-    grid-column: 1 / -1;
-  }
-
   .language-menu-button {
     min-width: 40px;
     padding-inline: 4px;