fix(ui): align contextual documentation with headings

Verified with the coordinated workspace changes by devkit full run
2026-09-08T225814-186389-0000-3e3ed7cd (all seven phases passed).
This shared UI pass does not mark the individual module reviews complete.

webui/src/features/cases/CaseDecisionDialog.tsx

@@ -103,6 +103,7 @@ export default function CaseDecisionDialog({
       <Dialog
         open={open}
         title={i18nMessage("i18n:govoplan-cases.decision_title", { value0: record.case_number })}
+        titleHelp={<DocumentationHelpLink reference={CASES_FIELDS_DOCUMENTATION} />}
         onClose={onClose}
         closeDisabled={busy}
         portal
@@ -123,7 +124,6 @@ export default function CaseDecisionDialog({
         }
       >
         <div className="case-decision-content" data-help-context-id="cases.decision.editor">
-          <DocumentationHelpLink reference={CASES_FIELDS_DOCUMENTATION} />
           {error ? <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert> : null}
           <p className="case-decision-explanation">
             The server verifies your current acting assignment, the effective Mandate, the exact Case revision, evidence, and legal basis before recording the outcome.