Per-shape hide + dimmed shape list in review editor (REQ-185, amended REQ-183)

- ReviewPage: hiddenShapeIds/overriddenShapeIds session Sets, H toggles
  selected/marked shapes, purge effect removed (dimmed rows selectable
  from list), auto-override on draw/assist/copy into hidden class,
  class-eye toggle clears that class's overrides
- ReviewSidebar: all rows listed, dimmed rows get restore eye, header
  count = total shapes
- ShortcutsPanel: H entry
- docs: REQ-183 amended + REQ-185 added; design/ui-spec/tasks synced

docs/tasks.md

@@ -1285,14 +1285,16 @@ failure modes to the counting path. The saving was always on the browser side.
 
 ## Task — Per-class hide toggle in review editor (REQ-183) `[DONE]`
 
-1. Eye button on each sidebar class row — a hidden class's shapes leave the canvas, the
-   "Shapes on this frame" list and every selection path while the row keeps its real
-   per-frame count and eye state; the choice is session-only (survives frame changes, resets
+1. Eye button on each sidebar class row — a hidden class's shapes leave the canvas and every
+   canvas selection path but stay in the "Shapes on this frame" list, dimmed, each with its
+   own restore eye (amended by REQ-185; the old leave-the-list and "not deletable" semantics
+   are superseded — see the REQ-185 entry below), while the row keeps its real per-frame count
+   and eye state; the choice is session-only (survives frame changes, resets
    when the review page is left, stored data untouched) → verify: **[DONE]** `cd frontend &&
    npm run build` passes (✓ 535 ms, 69 modules); `wc -l` caps hold —
    `frontend/src/components/Icons.jsx` (172) and
-   `frontend/src/components/ReviewSidebar.jsx` (129) ≤ 400,
-   `frontend/src/pages/ReviewPage.jsx` (666) exempt (pre-existing over the 400 cap, not
+   `frontend/src/components/ReviewSidebar.jsx` (145) ≤ 400,
+   `frontend/src/pages/ReviewPage.jsx` (725) exempt (pre-existing over the 400 cap, not
    split by this task); rebuilt Docker frontend serves the new bundle (HTTP 200 on :9000,
    `aria-pressed` present in the shipped JS); browser click-test of the eye toggle is NOT
    automated — manual click-test pending.
@@ -1321,6 +1323,20 @@ The REQ-031 amendment rides on this entry: cross-class greedy NMS with the per-c
 override and the containment carve-out is only real once the flag exists and both live sites
 read it.
 
+## Task — Per-shape hide + dimmed shape list (REQ-183 amended, REQ-185) `[DONE]`
+
+1. `H` hides/shows the selected or marked shapes; hidden shapes (by `H` or by their class)
+   stay listed dimmed in "Shapes on this frame", each dimmed row with a restore eye that
+   un-hides or overrides; shapes created into a hidden class (draw, assist, copy)
+   auto-override; the class-eye toggle clears that class's overrides; the old purge effect
+   and its "not deletable" invariant are gone → verify: **[DONE]** `cd frontend && npm run
+   build` passes (✓ 545 ms, 69 modules); `wc -l` — `frontend/src/components/ReviewSidebar.jsx`
+   ≤ 400 (145), `frontend/src/components/ShortcutsPanel.jsx` ≤ 400 (69),
+   `frontend/src/pages/ReviewPage.jsx` exempt (725, pre-existing over the 400 cap, not
+   split); `grep` proofs that `'h', 'H'` is in `isShortcutKey` (`ReviewPage.jsx:407`) and
+   that the removed purge effect (`while a class is hidden`) has zero hits left in
+   `ReviewPage.jsx`; browser `H`/eye click-test is NOT automated — manual click-test pending.
+
 ## Known open points
 
 - *Not closed by any task, by choice:* **any rebuild kills the running job.** Task 14's resume