feat(fase-19): wire EmojiPicker into 4 integration sites + EP-E specs

Replaces the four legacy hardcoded emoji arrays (settings avatar,
onboarding-create, CreateCollectiveModal, manage-collective rename) with
`<EmojiPicker selected={…} onSelect={…} />`. The shared component
delivers ~280 codepoints across 4 tabs instead of the previous 8–24
per surface, with consistent layout and behaviour.

Backwards-incompatible testid change on the manage page: the old
`collective-emoji-option-{e}` per-cell testid is gone — every cell now
lives under the picker's `emoji-picker-cell-{e}` namespace. Two existing
specs (onboarding O-02 + rename MC-01a) are updated to drive the new
tab → cell flow.

New e2e file `tests/e2e/emoji-picker.test.ts` covers EP-E-01..02:
- EP-E-01 — Ana on /settings picks 🍎 from "Comida"; DB row updates.
- EP-E-02 — Eva on /onboarding creates a collective with 🐱 from
  "Animales"; sidebar reflects the choice.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/web/tests/e2e/onboarding.test.ts

@@ -40,7 +40,9 @@ test.describe('Onboarding', () => {
 
 		const name = `Eva Home ${Date.now()}`;
 		await page.getByTestId('collective-name-input').fill(name);
-		await page.getByRole('button', { name: '🏡', exact: true }).click();
+		// EmojiPicker (Fase 19) — 🏡 lives in the "objects" tab; default is "faces".
+		await page.getByTestId('emoji-picker-tab-objects').click();
+		await page.getByTestId('emoji-picker-cell-🏡').click();
 		await page.getByTestId('collective-submit').click();
 
 		// Landing page after creation.