refactor(#619): kill DRAWER_GESTURE_SCREENS — screen-owned drawer gestures via HermesScaffold (#624)

Replaces the fragile DRAWER_GESTURE_SCREENS global set + defensive
LaunchedEffect(snapTo(Closed)) + closeDrawer callback workaround with a
single source of truth: each screen declares its drawer-gesture preference
via HermesScaffold's new drawerGesturesEnabled parameter (default true).

Architecture:
- DrawerGestureController holds the active gesture state. HermesScaffold
  reconciles each screen's preference into it via SideEffect; when a screen
  opts out while the drawer is open, the controller closes the drawer itself.
- LocalDrawerGestureController CompositionLocal flows the controller from
  MainNavigation down to ModalNavigationDrawer, which reads .enabled and
  passes it to Material's gesturesEnabled parameter.
- DisableDrawerGestures() helper for entry screens that don't use
  HermesScaffold (Landing, AuthLogin, PairingCodeEntry).
- All 6 Settings drill-down sub-pages pass drawerGesturesEnabled = false.
- NavigationController.closeDrawer removed; navigateTo no longer needs a
  synchronous drawer-dismiss hook.

Removes: DRAWER_GESTURE_SCREENS set, both LaunchedEffect(gesturesEnabled)
and LaunchedEffect(drawerGesturesEnabled) blocks, drawerGesturesEnabled
local state, closeDrawer callback on NavigationController.

Fixes the recurring drawer-scrim stuck-open bug class (PRs #445, #454, #455).

Verified: ktlintCheck, assembleDebug, testDebugUnitTest all green locally.

Co-authored-by: Hy4ri <hy4ri@users.noreply.github.com>

app/src/main/java/com/m57/hermescontrol/NavigationController.kt

@@ -18,11 +18,6 @@ object NavigationController {
     var backStack: NavBackStack<NavKey>? = null
     var pendingSessionId: String? = null
 
-    // Set by MainNavigation so navigation can synchronously dismiss the drawer
-    // (e.g. when drilling into a non-gesture sub-page) before a recomposition,
-    // preventing the drawer's gesture surface from intercepting the first tap.
-    var closeDrawer: (() -> Unit)? = null
-
     // Bottom-nav primary screens — dynamic, updated by Navigation.kt via
     // updatePrimaryScreens() when the user customises the bottom nav bar.
     // Default matches the default 5 bottom-nav items.
@@ -51,11 +46,11 @@ object NavigationController {
 
         if (isPrimaryScreen(key)) {
             stack.clear()
-        } else {
-            // Drilling into a sub-page (non-primary): dismiss the drawer
-            // synchronously so its gesture surface can't eat the next tap.
-            closeDrawer?.invoke()
         }
+        // Drawer dismissal is handled by DrawerGestureController (issue #619):
+        // when a non-gesture sub-page composes, its HermesScaffold reconciles
+        // drawerGesturesEnabled=false and the controller closes the drawer
+        // itself via SideEffect. No synchronous closeDrawer callback here.
         stack.add(key)
     }