style(13-03): apply Prettier formatting across repo

Mechanical reformat — no logic changes. 398 files changed, 19125
insertions(+), 16457 deletions(-). Prettier 3.8.4 with .prettierrc
(singleQuote:true, semi:true, tabWidth:2, trailingComma:all,
printWidth:100). Isolated per D-13-08 for reviewability.

apps/pwa/playwright.config.ts

@@ -11,7 +11,7 @@
  *   pnpm --filter @familysync/pwa test:e2e
  *   pnpm --filter @familysync/pwa exec playwright test --project=pixel
  */
-import { defineConfig, devices } from '@playwright/test'
+import { defineConfig, devices } from '@playwright/test';
 
 export default defineConfig({
   testDir: './e2e',
@@ -62,4 +62,4 @@ export default defineConfig({
     reuseExistingServer: !process.env.CI,
     timeout: 120_000,
   },
-})
+});