v1.0.47: built-in folder browsers, icon crop fix, nav bar button fix

- Replace SAF document picker with custom LocalBrowserDialog (File API,
  quick-access shortcuts, breadcrumb nav, search, folder-only listing)
- Rewrite RemoteBrowserDialog as full-screen dialog with breadcrumbs,
  search, and new-folder creation; add navigateToBreadcrumb/createFolder
  to RemoteBrowserViewModel
- Fix Select button cut off by navigation bar in both browsers: wrap
  button in Column(navigationBarsPadding()) so the button sits above
  the nav bar rather than behind it
- Tighten icon foreground crop to remove excess black border

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/src/main/kotlin/com/syncflow/ui/browser/RemoteBrowserViewModel.kt

@@ -57,6 +57,27 @@ class RemoteBrowserViewModel @Inject constructor(
         return true
     }
 
+    fun navigateToBreadcrumb(path: String) {
+        val stack = _state.value.pathStack
+        val idx = stack.lastIndexOf(path)
+        val newStack = if (idx >= 0) stack.take(idx + 1) else listOf(path)
+        loadJob?.cancel()
+        _state.update { it.copy(currentPath = path, pathStack = newStack, isLoading = true, entries = emptyList(), error = null) }
+        loadJob = loadPath(_state.value.accountId, path)
+    }
+
+    fun createFolder(name: String) {
+        val s = _state.value
+        val newPath = if (s.currentPath.trimEnd('/') == "") "/$name" else "${s.currentPath.trimEnd('/')}/$name"
+        viewModelScope.launch {
+            val account = accountRepository.getAccount(s.accountId) ?: return@launch
+            val provider = runCatching { providerFactory.create(account) }.getOrElse { return@launch }
+            provider.createDirectory(newPath)
+                .onSuccess { retry() }
+                .onFailure { e -> _state.update { it.copy(error = "Could not create folder: ${e.message}") } }
+        }
+    }
+
     fun retry() {
         val s = _state.value
         if (s.accountId == -1L) return