v0.3.1 — overlay drag fix + drag-to-dismiss zone

- Bug: dragging the bubble panned the OSM map instead of moving the
  bubble. The OnTouchListener was attached to the ComposeView, but
  the inner MapView consumed ACTION_DOWN for its own pan handling
  before the listener fired. Fix: wrap the ComposeView in a custom
  TouchInterceptor FrameLayout whose onInterceptTouchEvent always
  returns true. Touches go to the wrapper's OnTouchListener; child
  views (including MapView) never see them. Bubble is now purely a
  visualization — pan/zoom is impossible.
- Drag-to-dismiss: when the user starts dragging (after passing
  TAP_SLOP), a translucent dark circle with a white X appears at
  bottom-center via a separate WindowManager view. Highlights red
  when the bubble's screen-space center is within hit slop of the X.
  Releasing on the X tears down the bubble AND fires onDismissed —
  DetectionService flips setOverlayEnabled(false) so the toggle and
  the bubble state stay in sync. Releasing elsewhere is a normal
  drag (just repositions). The dismiss zone uses FLAG_NOT_TOUCHABLE
  so it never steals the gesture; it's purely visual feedback.

app/build.gradle.kts

@@ -12,8 +12,8 @@ android {
         applicationId = "org.soulstone.overwatch"
         minSdk = 26
         targetSdk = 35
-        versionCode = 12
-        versionName = "0.3.0"
+        versionCode = 13
+        versionName = "0.3.1"
     }
 
     buildTypes {