feat(20-03): unify member editor + declutter admin members panel

- playwright-cli verified: Members tab shows tappable rows, no retired buttons
- Row tap opens 'Edit member' sheet; per-section saves keep sheet open
- 'Add member' trigger opens 'Add member' sheet in create mode
- Profile save fires 'Profile saved.' toast; sheet stays open (D-05)
- eslint + prettier + typecheck + vitest (275 tests) all pass
- Fix pre-existing prettier drift in docs/*, CLAUDE.md, README.md, api/admin.ts

apps/api/tests/routes/admin.test.ts

@@ -1094,7 +1094,9 @@ describe('PATCH /api/admin/members/:id', () => {
     // GET /members should reflect the updated displayName
     const getRes = await app.fetch(jsonRequest('GET', '/api/admin/members'));
     expect(getRes.status).toBe(200);
-    const getBody = (await getRes.json()) as { members: Array<{ id: number; displayName: string }> };
+    const getBody = (await getRes.json()) as {
+      members: Array<{ id: number; displayName: string }>;
+    };
     const updated = getBody.members.find((m) => m.id === memberId);
     expect(updated).toBeDefined();
     expect(updated!.displayName).toBe('New Name');