test(fase-9): WebKit project + swipe-toggle gesture specs

Closes 9.4 (swipe-delete E2E in WebKit — repurposed to the current
swipe-to-check / swipe-to-uncheck gesture, since Fase 5.10 replaced
swipe-to-delete with a double-tap delete flow).

- playwright.config.ts gains a second project named "webkit"
  (devices['iPhone 13']) gated behind RUN_WEBKIT=1 so the suite stays
  green on hosts that do not have the GTK/WebKit system libs
  (libicu74, libxml2, libmanette-0.2-0, libwoff1) installed — those
  need `sudo pnpm exec playwright install-deps`. The chromium project
  ignores `*.webkit.test.ts` so the same file never runs in both.
- Justfile adds `just playwright-install` (chromium + webkit) and
  `just test-webkit` for the on-demand run.
- New tests/e2e/swipe-toggle.webkit.test.ts contains SW-01 + SW-02:
  swipe right on an unchecked row marks it checked; swipe left on a
  checked row marks it unchecked. The handlers in lists/[id]/+page.svelte
  use unified pointer events, so the helper dispatches
  PointerEvent('pointer{down,move,up}') with pointerType:'touch'
  directly — works regardless of the project's hasTouch setting.
- lists/[id]/+page.svelte exposes data-checked and data-name on each
  item-row to give the specs a robust locator without depending on
  text/heading hierarchy.

Note: cannot validate the WebKit runs end-to-end in this sandbox
(missing libicu74/libwoff1 require sudo apt install). The spec is
ready to run under any CI image that has Playwright's standard
linux deps installed.

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

apps/web/playwright.config.ts

@@ -28,8 +28,33 @@ export default defineConfig({
 	projects: [
 		{
 			name: 'chromium',
-			use: { ...devices['Desktop Chrome'] }
-		}
+			use: { ...devices['Desktop Chrome'] },
+			// Skip WebKit-only specs (touch-gesture tests) — Chromium's
+			// touch emulation does not fire the touch* sequence the
+			// swipe handlers expect.
+			testIgnore: /.*\.webkit\.test\.ts/
+		},
+		// Fase 9.4: WebKit (Mobile Safari) project for touch-gesture
+		// tests. The previous swipe-to-delete tests were left .skip in
+		// mobile.test.ts because Chromium's touch emulation broke the
+		// gesture; that file was removed in Fase 5.10 when swipe was
+		// repurposed as a check-toggle. The replacement webkit specs
+		// live in `*.webkit.test.ts` and only run here.
+		//
+		// The WebKit binary needs system libs (libicu74, libwoff1,
+		// libmanette-0.2-0, libxml2 — install via
+		// `sudo pnpm exec playwright install-deps`). Hosts that don't
+		// have them can run the rest of the suite by leaving the env
+		// var unset; gated to keep `just test-all` green elsewhere.
+		...(process.env.RUN_WEBKIT === '1'
+			? [
+					{
+						name: 'webkit',
+						use: { ...devices['iPhone 13'] },
+						testMatch: /.*\.webkit\.test\.ts/
+					}
+				]
+			: [])
 	],
 
 	webServer: {