feat(flags): hide Repeated Word Check behind a feature flag (bundles #320)

docs/proposals/repeated-word-check/checks-ui-integration-summary.md

@@ -18,7 +18,7 @@ Give translators the user-facing half of the Repeated Word Check: a **Checks tab
 
 4. **Chapter-wide check on every successful verse auto-save** (W3/W4): a TanStack `useQuery` keyed on `(chapterAssignmentId, saveCounter)` sending all drafted verses; `snt_id` = `"{bookCode} {chapter}:{verse}"` (USFM, the smoke-test convention); no extra debounce beyond the existing 2 s save debounce. Drafting mode only (W10).
 
-5. **Three-layer active/inactive cascade, most-specific-non-silent-wins** (W5/W6): Greek Room's `legitimate` verdict → user-global word-pair rule → occurrence rule `(snt_id, repeated_word, ordinal)`; rules are tri-state maps (`absent/'suppress'/'surface'`), which is what makes per-occurrence **undo** of a global rule or machine verdict possible. The dot counts active findings only; ignored items are hidden by default and revealed dimmed (with "Default Ignore"/"Ignore Here"/"Ignore Always" reason labels and "Undo Ignore") under a **"Show Ignored" toggle** (default off, not persisted), matching the revised #278.
+5. **Three-layer active/inactive cascade, most-specific-non-silent-wins** (W5/W6): Greek Room's `legitimate` verdict → user-global word-pair rule → occurrence rule `(snt_id, repeated_word, ordinal)`; rules are tri-state maps (`absent/'suppress'/'surface'`), which is what makes per-occurrence **undo** of a global rule or machine verdict possible. The dot counts active findings only; ignored items are hidden by default and revealed dimmed (with "Default Ignore"/"Ignore Here"/"Ignore Everywhere" reason labels and "Undo Ignore") under a **"Show Ignored" toggle** (default off, not persisted), matching the revised #278.
 
 6. **Graceful degradation, either-PR-lands-first** (W8/W9): the UI feature-detects `GET /self/settings` (404 ⇒ "Ignore Everywhere" simply not rendered — capability hidden, never a dead control); check failures surface as one inline red line in the panel while the last successful findings stay rendered (TanStack default). No toasts/banners — none exist in this codebase. **"Ignore Everywhere" shows a confirm dialog** (per revised #278) while still being reversible via undo.
 

package.json

@@ -38,6 +38,7 @@
     "@radix-ui/react-select": "^2.2.6",
     "@radix-ui/react-separator": "^1.1.7",
     "@radix-ui/react-slot": "^1.2.2",
+    "@radix-ui/react-switch": "^1.3.1",
     "@radix-ui/react-tooltip": "^1.2.8",
     "@radix-ui/react-visually-hidden": "^1.2.3",
     "@tanstack/react-query": "^5.84.1",