fix(case-page): resolve full-page review findings (bugs + RTL + resilience)

Full code review of the case-detail page (14 components) surfaced these,
all fixed here:

Logic bugs
- case-edit-dialog: form.reset ran on the 5s useCase refetch while the dialog
  was open, clobbering in-progress edits. Now resets only on open→true.
- status-changer: `selected` never synced to async/external `currentStatus`
  (stale dropdown). Reworked to track currentStatus until an explicit pick;
  resets to tracking after save.
- decision-blocks-panel: `block.content`/`word_count` accessed without null
  guards (endpoint has no response model) → potential render crash. Coerced
  with `?? ""` / `?? 0`. `STATUS_LABELS[status]` now falls back to the raw
  status instead of rendering literal "undefined".
- document-type-editor: `await mutateAsync()` in async click handlers without
  try/catch → unhandled promise rejection. Wrapped (errors still surface via
  isError).

Resilience / hygiene
- page.tsx: a transient 5xx on the background poll flipped the WHOLE page to
  the error card and discarded loaded data. Now gated on `!data`, plus a
  "נסה שוב" retry.
- cases.ts useUpdateCase: invalidated casesKeys.all, which re-invalidated the
  detail it had just optimistically patched. Scoped to the list prefix.

RTL correctness (logical properties)
- agent-status-widget `mr-auto`→`ms-auto`; agent-activity-feed `mr-auto`→
  `me-auto`, icon `ml-1/ml-2`→`me-1/me-2`, required `*` `mr-1`→`ms-1`;
  document-type-editor list `pr-4`→`ps-4`.

Minors
- drafts-panel: `<a href>`→`next/link` (operations + citation links) for SPA
  nav. agent-activity-feed: issueMap memoized; comment Textarea aria-label.
  upload-sheet: `unknown` status no longer shown as green success (neutral
  icon + "רענן לאישור"). citations.ts: case_name typed `string | null`.

Design gate: visual-touching items (RTL gap side, retry button, neutral
upload icon) were chair-authorized via the reviewed-findings approval ("fix
all"); none alter an approved page layout — they are correctness fixes.
tsc clean; eslint clean (1 pre-existing form.watch warning, untouched line).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web-ui/src/components/cases/decision-blocks-panel.tsx

@@ -56,7 +56,7 @@ export function DecisionBlocksPanel({ caseNumber }: { caseNumber: string }) {
   }
   if (!data) return null;
 
-  const written = data.blocks.filter((b) => b.word_count > 0).length;
+  const written = data.blocks.filter((b) => (b.word_count ?? 0) > 0).length;
 
   return (
     <div className="space-y-4">
@@ -101,11 +101,11 @@ export function DecisionBlocksPanel({ caseNumber }: { caseNumber: string }) {
                   {blockLabel(block)}
                 </span>
                 <Badge
-                  className={`text-[0.65rem] border ${STATUS_CLASSES[block.status]}`}
+                  className={`text-[0.65rem] border ${STATUS_CLASSES[block.status] ?? ""}`}
                 >
-                  {STATUS_LABELS[block.status]}
+                  {STATUS_LABELS[block.status] ?? block.status}
                 </Badge>
-                {block.word_count > 0 && (
+                {(block.word_count ?? 0) > 0 && (
                   <span className="text-[0.7rem] text-ink-muted tabular-nums">
                     {block.word_count} מילים
                   </span>
@@ -137,19 +137,22 @@ function BlockEditor({
   caseNumber: string;
   block: DecisionBlock;
 }) {
+  // The endpoint has no FastAPI response model, so `content` may arrive null
+  // for an empty block — coerce to "" to keep `.trim()` / state safe.
+  const content = block.content ?? "";
   const [editing, setEditing] = useState(false);
-  const [value, setValue] = useState(block.content);
+  const [value, setValue] = useState(content);
   const [state, setState] = useState<SaveState>({ kind: "idle" });
   /* The last content known to be persisted — used to skip no-op saves. */
-  const [baseline, setBaseline] = useState(block.content);
+  const [baseline, setBaseline] = useState(content);
   const save = useSaveBlock(caseNumber);
 
   /* Re-sync when the upstream query refetches (e.g. after another save) while
    * not actively editing. Adjusting state during render — the documented React
    * pattern for derived-from-props — avoids a setState-in-effect cascade. */
-  if (!editing && block.content !== baseline) {
-    setBaseline(block.content);
-    setValue(block.content);
+  if (!editing && content !== baseline) {
+    setBaseline(content);
+    setValue(content);
   }
 
   async function handleSave() {
@@ -171,8 +174,8 @@ function BlockEditor({
   if (!editing) {
     return (
       <div className="space-y-3">
-        {block.content.trim() ? (
-          <Markdown content={block.content} />
+        {content.trim() ? (
+          <Markdown content={content} />
         ) : (
           <p className="text-sm text-ink-muted italic">בלוק ריק.</p>
         )}