fix(mobile): splash/icon sizing, worktree sleep, host removal persistence

- Add worktree.sleep RPC method with full notifier chain (runtime → IPC → renderer)
- Optimistic UI update for sleeping worktrees in mobile client
- Fix splash screen: configure expo-splash-screen plugin, hide splash only after navigator layout
- Regenerate app icon and splash assets at correct density sizes
- Fix host removal not persisting by disabling Android auto-backup (allowBackup=false)
- Guard against invalid host credentials (base64 crash) and prevent navigating into auth-failed hosts
- Extract ActionSheetContent for inline drawer content switching
- Rewrite BottomDrawer as always-mounted Animated.View overlay (replaces Modal)
- Add ConfirmModal component with inline confirm/cancel buttons

Co-authored-by: Orca <help@stably.ai>

src/main/runtime/orca-runtime.test.ts

@@ -1249,6 +1249,7 @@ describe('OrcaRuntimeService', () => {
       renameTerminal: vi.fn(),
       focusTerminal: vi.fn(),
       closeTerminal: vi.fn(),
+      sleepWorktree: vi.fn(),
       terminalFitOverrideChanged: vi.fn()
     })
     runtime.attachWindow(TEST_WINDOW_ID)
@@ -1274,6 +1275,7 @@ describe('OrcaRuntimeService', () => {
       renameTerminal: vi.fn(),
       focusTerminal: vi.fn(),
       closeTerminal: vi.fn(),
+      sleepWorktree: vi.fn(),
       terminalFitOverrideChanged: vi.fn()
     })
     runtime.attachWindow(1)
@@ -1442,6 +1444,7 @@ describe('OrcaRuntimeService', () => {
       renameTerminal: vi.fn(),
       focusTerminal: vi.fn(),
       closeTerminal: vi.fn(),
+      sleepWorktree: vi.fn(),
       terminalFitOverrideChanged: vi.fn()
     })
 
@@ -1575,6 +1578,7 @@ describe('OrcaRuntimeService', () => {
         renameTerminal: vi.fn(),
         focusTerminal: vi.fn(),
         closeTerminal: vi.fn(),
+        sleepWorktree: vi.fn(),
         terminalFitOverrideChanged: (ptyId, mode, cols, rows) => {
           notifications.push({ ptyId, mode, cols, rows })
         }