feat: add ShareRoomPicker component for selecting rooms to share Android content

- Implemented ShareRoomPicker component to allow users to pick a room for sharing content received from Android intents.
- Integrated search functionality to filter rooms and directs.
- Added virtualized list for efficient rendering of room options.
- Created utility functions for handling Android share payloads, including fetching and clearing pending shares.

Co-authored-by: Copilot <copilot@github.com>

overlay/src/app/utils/androidShare.ts

@@ -0,0 +1,73 @@
+import { Capacitor, registerPlugin, type PluginListenerHandle } from '@capacitor/core';
+
+/** Metadata for a file received from an Android share intent. */
+export type AndroidSharedFile = {
+  path: string;
+  name: string;
+  mimeType: string;
+  size: number;
+};
+
+/** Payload persisted by the native Android share handler. */
+export type AndroidSharePayload = {
+  text?: string;
+  subject?: string;
+  files: AndroidSharedFile[];
+  receivedAt: number;
+};
+
+interface AndroidShareHandlerPlugin {
+  /** Returns the last pending share payload, if one exists. */
+  getPendingShare(): Promise<{ share: AndroidSharePayload | null }>;
+  /** Clears the last pending share payload after it has been consumed. */
+  clearPendingShare(): Promise<void>;
+  addListener(
+    eventName: 'shareReceived',
+    listenerFunc: (payload: AndroidSharePayload) => void
+  ): Promise<PluginListenerHandle>;
+}
+
+const AndroidShareHandler = registerPlugin<AndroidShareHandlerPlugin>('AndroidShareHandler');
+
+/** Returns true when the Android share bridge is available. */
+export const isAndroidShareSupported = (): boolean =>
+  Capacitor.isNativePlatform() && Capacitor.getPlatform() === 'android';
+
+/** Fetches the current pending native share payload. */
+export const getPendingAndroidShare = async (): Promise<AndroidSharePayload | null> => {
+  if (!isAndroidShareSupported()) return null;
+  const result = await AndroidShareHandler.getPendingShare();
+  return result.share;
+};
+
+/** Clears the native pending share payload. */
+export const clearPendingAndroidShare = async (): Promise<void> => {
+  if (!isAndroidShareSupported()) return;
+  await AndroidShareHandler.clearPendingShare();
+};
+
+/** Subscribes to new incoming native share payloads. */
+export const listenForAndroidShares = async (
+  listener: (payload: AndroidSharePayload) => void
+): Promise<PluginListenerHandle | undefined> => {
+  if (!isAndroidShareSupported()) return undefined;
+  return AndroidShareHandler.addListener('shareReceived', listener);
+};
+
+/** Converts a cached native shared file into a browser File for upload. */
+export const materializeSharedFile = async (
+  sharedFile: AndroidSharedFile,
+  receivedAt: number
+): Promise<File> => {
+  const fileUrl = Capacitor.convertFileSrc(sharedFile.path);
+  const response = await fetch(fileUrl);
+  if (!response.ok) {
+    throw new Error(`Failed to read shared file: ${sharedFile.name}`);
+  }
+
+  const blob = await response.blob();
+  return new File([blob], sharedFile.name, {
+    type: sharedFile.mimeType || blob.type,
+    lastModified: receivedAt,
+  });
+};