feat: settings screen, haptic toggle, rain/lightning toggles, review docs

CHANGELOG.md

@@ -37,10 +37,23 @@ Versions follow [semver](https://semver.org/): MAJOR.MINOR.PATCH
 - Reality keypair generated (was placeholder). Throttle `uplinkOnly`/`downlinkOnly`
   corrected (seconds, not bytes/sec). Fallback rate limits removed (fingerprint).
 
+### Added
+- **Settings screen** — reached from a new sidebar row (between Website and
+  Check for updates). Slide-from-right navigation via `PageRouteBuilder`.
+  Folder: `lib/screens/settings/` with one file per feature in `in_settings/`.
+- **Haptic feedback toggle** — on/off switch in Settings for `lightImpact()`
+  vibration on successful connect/disconnect. Default: off. Uses sync-bool
+  pattern (no await on tap, no SharedPreferences in connect button).
+- **Rain/Lightning effect toggles** — two switches in Settings to control
+  the animated background effects. Default: on. Effects detect the toggle
+  within one frame (no Provider/notifier needed).
+
 ### Changed
 - **Timer box spinner removed** — the "Connecting…"/"Syncing…" spinner under
   the countdown was redundant with the connect button's spinner. Timer card
   is now a clean countdown only (gray '00:00:00' when idle).
+- **Sidebar** now has 7 rows (added Settings). `FRONTEND_POLISH_REVIEW.md`
+  fully triaged: 4 items fixed, 11 skipped.
 
 ### Server
 - `api` outbound + 3 routing rules in `xray_config_reality.json` (bootstrap