Media transfers (#440)

* tor voice wip

* worky BLE a bit

* can send sound

* remove tor

* ui cleanup

* recording time

* progress bar color

* nicknames for audio

* onboarding permissions no microphone

* may work

* fix destionation

* extend

* refactor voice input component

* fix keyboard collapse issue

* send images

* wip image open

* image sending works

* wip waveforms

* better

* better animation

* fix cursor for sending audio

* image sending animation

* image sending animation

* full screen image viewer

* gossip sync for fragments too

* reduce delays

* fix keyboard focus

* use v2 for file transfers

* do not sync fragments

* scrollable image viewer

* ui

* ui adjustments

* nicer animation

* seek through audio

* add spec

* add more details to documentation

* File sharing E2E:
- Add TLV BitchatFilePacket, FileSharingManager
- Implement sendFileNote in ChatViewModel
- File receive path: save to files/incoming and render [file] messages with FileMessageItem or FileSendingAnimation during transfer
- SAF FilePickerButton and dispatcher wiring; image/file choice to follow in MediaPickerOptions
- Add FileViewerDialog with system open/save, FileProvider and file_paths
- Hook transfer progress to file sending UI
- Manifest: READ_MEDIA_* and FileProvider
- Fix MessageHandler saving and prefix for non-image payloads
- Add helper utils (FileUtils)

* kinda wip

* fix buttons

* files half working

* wip file transfer

* file packet has 2-byte TLV and chunks. it wokrs but it sucks

* clean

* remove gossip sync for fragments

* fix audio and image rendering

* adjust FILE_SIZE TLV size too

* cleanup

* haptic

* private messages media

* read receipts for media

* use enum for message type not string

* delivery ack checks dont push content

* check

* animation fix

* refactor

* ui adjustments

* comments

* refactor

* fix crash on send and receive of the same file

* refactor notifications

* tests

app/src/main/AndroidManifest.xml

@@ -20,6 +20,15 @@
     <!-- Notification permissions -->
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
     
+    <!-- Microphone for voice notes -->
+    <uses-permission android:name="android.permission.RECORD_AUDIO" />
+
+    <!-- Storage permissions for file sharing -->
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" android:maxSdkVersion="28" />
+    <uses-permission android:name="android.permission.READ_MEDIA_IMAGES" />
+    <uses-permission android:name="android.permission.READ_MEDIA_VIDEO" />
+    <uses-permission android:name="android.permission.READ_MEDIA_AUDIO" />
+
     <!-- Haptic feedback permission -->
     <uses-permission android:name="android.permission.VIBRATE" />
     
@@ -41,6 +50,16 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.BitchatAndroid"
         tools:targetApi="31">
+        <!-- FileProvider for sharing temp/cache files with external viewers -->
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_paths" />
+        </provider>
         <activity
             android:name=".ui.GeohashPickerActivity"
             android:exported="false"