refactor(representations): decompose representation flow shell into form stage and timetable panel (Slice R4, behaviour-preserving)

context/representations-refactor-tracker.md

@@ -45,6 +45,24 @@ Status: COMPLETE
 
 Notes: Completed in prior refactor slice work; no additional changes required in this closeout.
 
+**Completion notes (this slice):**
+
+- Implemented on feature branch created from `refactor`: `rep-slice-r4-flow-shell`.
+- Extracted render-shell structure from `components/case/representation/index.js` into:
+    - `components/case/representation/shell/RepresentationFlowFormStage.js`
+    - `components/case/representation/shell/RepresentationTimetablePanel.js`
+- Kept `index.js` as orchestration owner (no side-effect migration):
+    - `onHandleSubmit` unchanged in location/ownership
+    - `updateRepresentation` unchanged in location/ownership
+    - upload/PDF/email sequencing unchanged
+    - stage-resolution/questionnaire decisions remain in `index.js`
+- Preserved explicit prop passing; no grouped-prop/view-model abstraction introduced in this slice.
+- Validation evidence:
+    - `npm run lint` completed (warnings only, no new errors).
+    - `npm run test:reps` completed: **6 passed**.
+    - Manual APP/IP/Agent/LPA checks: **passed**.
+    - Manual EN/CY parity checks: **passed**.
+
 ---
 
 ### Slice R5 — Representation Elements Normalisation