refactor(web): consolidate change password into account section dialog

Replace the standalone `ChangePasswordSection` card with a `ChangePasswordDialog` triggered from a button next to "Sign out" in the account section. This removes the separate card, merges the dialog logic into `account-section.tsx`, and cleans up the settings page layout accordingly.

package.json

@@ -29,6 +29,9 @@
   "packageManager": "bun@1.3.10",
   "scripts": {
     "dev": "turbo run dev",
+    "dev:web": "turbo run dev --filter=@sofa/web --filter=@sofa/server",
+    "dev:native": "turbo run dev --filter=@sofa/native",
+    "dev:docs": "cd docs && bun run dev",
     "build": "turbo run build",
     "lint": "turbo run lint",
     "format": "turbo run format",