add fullHeight prop, fix Android bottom sheet behavior, keyboard handling

Native module:
- Add `fullHeight` prop to BottomSheetView on Android and iOS
- iOS: fullHeight sets detent to .large, skips content observation
- Android: fullHeight uses isFitToContents=false with expandedOffset=statusBarHeight

Android bottom sheet behavior overhaul:
- Switch normal sheets to isFitToContents=false with expandedOffset, enabling
  proper 3-state snapping (half-expanded ↔ expanded ↔ hidden). Previously
  isFitToContents=true prevented settling at half-expanded during gestures,
  making it impossible to swipe back down from expanded.
- preventExpansion sheets keep isFitToContents=true with maxHeight cap, plus
  a state callback safety net that bounces EXPANDED→HALF_EXPANDED. This
  catches an edge case where rapid content resizes during opening can invert
  the expanded/half-expanded offsets, causing the sheet to dismiss.
- Add requestLayout() after maxHeight changes in updateLayout() so the
  FrameLayout actually re-measures (fixes keyboard padding not resizing sheet)
- Set backgroundTint=transparent in the theme to remove Material3 surface
  tint that was visible in gaps between sheet and screen edge

Keyboard handling:
- Remove native keyboard expansion logic (insets listener, isKeyboardVisible
  tracking, manual STATE_EXPANDED on keyboard show)
- Replace with JS-side keyboard padding: ScrollableInner listens for RN
  Keyboard events and adds bottom padding equal to keyboard height
- Generalize useOnKeyboardDidShow → useOnKeyboard(eventName, cb)

Callers:
- Replace minHeight: screenHeight hack with fullHeight: true in EditProfile,
  ChangeHandle, AddAppPassword, ImageAltText, GifAltText, LanguageSelect,
  FollowDialog, GifSelect, StarterPack, Select, NewChat, ShareViaChat,
  DraftsList, WizardEditList, ListAddRemoveUsers, CreateOrEditList
- Remove unused useWindowDimensions imports
- ServerInput: simplify to just preventExpansion (was platform-specific)
- ImageAltTextDialog: remove old {height: 300} keyboard spacer hack

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

modules/bottom-sheet/ios/BottomSheetModule.swift

@@ -19,6 +19,10 @@ public class BottomSheetModule: Module {
         view.dismiss()
       }
 
+      Prop("fullHeight") { (view: SheetView, prop: Bool) in
+        view.fullHeight = prop
+      }
+
       Prop("cornerRadius") { (view: SheetView, prop: Float) in
         view.cornerRadius = CGFloat(prop)
       }

modules/bottom-sheet/ios/SheetView.swift

@@ -26,6 +26,7 @@ class SheetView: ExpoView, UISheetPresentationControllerDelegate {
   }
 
   // React view props
+  var fullHeight = false
   var preventDismiss = false
   var preventExpansion = false
   var cornerRadius: CGFloat?
@@ -132,7 +133,7 @@ class SheetView: ExpoView, UISheetPresentationControllerDelegate {
     }
 
     let sheetVc = SheetViewController()
-    sheetVc.setDetents(contentHeight: self.clampHeight(contentHeight), preventExpansion: self.preventExpansion)
+    sheetVc.setDetents(contentHeight: self.clampHeight(contentHeight), preventExpansion: self.preventExpansion, fullHeight: self.fullHeight)
     if let sheet = sheetVc.sheetPresentationController {
       sheet.delegate = self
       sheet.preferredCornerRadius = self.cornerRadius
@@ -151,7 +152,9 @@ class SheetView: ExpoView, UISheetPresentationControllerDelegate {
 
     self.sheetVc = sheetVc
     self.isOpening = true
-    self.startObservingContentHeight()
+    if !self.fullHeight {
+      self.startObservingContentHeight()
+    }
 
     rvc.present(sheetVc, animated: true) { [weak self] in
       self?.isOpening = false

modules/bottom-sheet/ios/SheetViewController.swift

@@ -20,13 +20,19 @@ class SheetViewController: UIViewController {
     }
   }
 
-  func setDetents(contentHeight: CGFloat, preventExpansion: Bool) {
+  func setDetents(contentHeight: CGFloat, preventExpansion: Bool, fullHeight: Bool = false) {
     guard let sheet = self.sheetPresentationController,
           let screenHeight = Util.getScreenHeight()
     else {
       return
     }
 
+    if fullHeight {
+      sheet.detents = [.large()]
+      sheet.selectedDetentIdentifier = .large
+      return
+    }
+
     // On iOS 26, the floaty sheet presentation adds the device bottom safe area
     // on top of the custom detent value, creating visible padding inside the pill.
     // Subtract it so the pill height matches our actual content.