Stage 17 (#3,#5,#10): hover-hold drag zoom, always-editable profile, drag-back + double-tap recall

- Board drag now auto-zooms toward a cell after holding the tile over it ~1s (#3).
- Profile is inline-editable: drop the Edit/Cancel toggle, form is always shown
  for durable accounts; hint balance stays read-only; re-populate after link/merge (#5).
- A pending tile recalls by double-tap (same cell) or by dragging it back onto the
  rack (unzoomed board); a single tap no longer recalls (#10).
- e2e: lock double-tap recall + single-tap no-op; drop the removed Edit-profile click.

ui/e2e/social.spec.ts

@@ -54,7 +54,6 @@ test('profile edit saves a new display name', async ({ page }) => {
   await loginLobby(page);
   await page.locator('.burger').first().click();
   await page.getByRole('button', { name: /Profile/ }).click();
-  await page.getByRole('button', { name: /Edit profile/ }).click();
   await page.locator('.edit input').first().fill('Kaya Test');
   await page.getByRole('button', { name: /^Save$/ }).click();
   await expect(page.locator('.name')).toHaveText('Kaya Test');
@@ -127,7 +126,6 @@ test('profile edit disables Save and flags an invalid display name', async ({ pa
   await loginLobby(page);
   await page.locator('.burger').first().click();
   await page.getByRole('button', { name: /Profile/ }).click();
-  await page.getByRole('button', { name: /Edit profile/ }).click();
 
   const name = page.locator('.edit input').first();
   const save = page.getByRole('button', { name: /^Save$/ });