refactor(mobile): sqlite-based map view (#20665)

* feat(mobile): drift map page

* refactor: map query

* perf: do not filter markers

* fix: refresh timeline by key

* chore: rename

* remove ref listen and global key

* clean code

* remove locked and favorite

* temporary change for stress test

* optimizations

* fix bottom sheet

* cleaner bounds check

* cleanup

* feat: back button

---------

Co-authored-by: wuzihao051119 <wuzihao051119@outlook.com>
Co-authored-by: Alex <alex.tran1502@gmail.com>

mobile/lib/utils/debounce.dart

@@ -27,8 +27,9 @@ class Debouncer {
   }
 
   Future<void>? drain() {
-    if (_timer != null && _timer!.isActive) {
-      _timer!.cancel();
+    final timer = _timer;
+    if (timer != null && timer.isActive) {
+      timer.cancel();
       if (_lastAction != null) {
         _callAndRest();
       }