Phase 4: FFmpeg conditional import (web-safe), remove unused dio + pointycastle (~230KB saved)

sojorn_app/lib/providers/quip_upload_provider.dart

@@ -1,7 +1,6 @@
 import 'dart:io';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
-import 'package:ffmpeg_kit_flutter_new/ffmpeg_kit.dart';
-import 'package:ffmpeg_kit_flutter_new/return_code.dart';
+import '../services/media/ffmpeg.dart';
 import 'package:path_provider/path_provider.dart';
 import '../services/auth_service.dart';
 import '../services/api_service.dart';

sojorn_app/lib/screens/admin/quip_repair_screen.dart

@@ -1,8 +1,7 @@
 import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
-import 'package:ffmpeg_kit_flutter_new/ffmpeg_kit.dart';
-import 'package:ffmpeg_kit_flutter_new/return_code.dart';
+import '../../services/media/ffmpeg.dart';
 import 'package:path_provider/path_provider.dart';
 import '../../services/image_upload_service.dart';
 import '../../providers/api_provider.dart';

sojorn_app/lib/screens/compose/video_editor_screen.dart

@@ -6,8 +6,7 @@ import 'package:flutter/material.dart';
 import 'package:google_fonts/google_fonts.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:video_player/video_player.dart';
-import 'package:ffmpeg_kit_flutter_new/ffmpeg_kit.dart';
-import 'package:ffmpeg_kit_flutter_new/return_code.dart';
+import '../../services/media/ffmpeg.dart';
 
 import '../../models/sojorn_media_result.dart';
 import '../../theme/app_theme.dart';

sojorn_app/lib/screens/quips/create/quip_metadata_screen.dart

@@ -2,8 +2,7 @@ import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:video_player/video_player.dart';
-import 'package:ffmpeg_kit_flutter_new/ffmpeg_kit.dart';
-import 'package:ffmpeg_kit_flutter_new/return_code.dart';
+import '../../../services/media/ffmpeg.dart';
 import 'package:path_provider/path_provider.dart';
 import '../../../providers/quip_upload_provider.dart';
 import '../../../services/image_upload_service.dart';

sojorn_app/lib/services/media/ffmpeg.dart

@@ -0,0 +1,2 @@
+/// Conditional export: web gets the stub, mobile/desktop gets the real package.
+export 'ffmpeg_stub.dart' if (dart.library.io) 'ffmpeg_io.dart';

sojorn_app/lib/services/media/ffmpeg_io.dart

@@ -0,0 +1,4 @@
+/// Mobile/desktop: re-export the real ffmpeg_kit_flutter_new classes.
+export 'package:ffmpeg_kit_flutter_new/ffmpeg_kit.dart';
+export 'package:ffmpeg_kit_flutter_new/ffmpeg_session.dart';
+export 'package:ffmpeg_kit_flutter_new/return_code.dart';

sojorn_app/lib/services/media/ffmpeg_stub.dart

@@ -0,0 +1,48 @@
+/// Web-safe stubs that mirror the ffmpeg_kit_flutter_new API surface.
+/// These classes compile on web but always return failure / no-op.
+
+class FFmpegKit {
+  static Future<FFmpegSession> execute(String command) async {
+    return FFmpegSession._();
+  }
+
+  static Future<FFmpegSession> executeAsync(
+    String command, [
+    Function? completeCallback,
+    Function? logCallback,
+    Function? statisticsCallback,
+  ]) async {
+    final session = FFmpegSession._();
+    completeCallback?.call(session);
+    return session;
+  }
+
+  static Future<FFmpegSession> executeWithArguments(
+    List<String> arguments, [
+    Function? completeCallback,
+    Function? logCallback,
+    Function? statisticsCallback,
+  ]) async {
+    final session = FFmpegSession._();
+    completeCallback?.call(session);
+    return session;
+  }
+}
+
+class FFmpegSession {
+  FFmpegSession._();
+
+  Future<ReturnCode?> getReturnCode() async => ReturnCode._(-1);
+  Future<String?> getOutput() async => null;
+  Future<String?> getAllLogsAsString() async => null;
+}
+
+class ReturnCode {
+  final int _value;
+  ReturnCode._(this._value);
+
+  static bool isSuccess(ReturnCode? code) => false;
+
+  @override
+  String toString() => 'ReturnCode($_value)';
+}

sojorn_app/lib/services/video_stitching_service.dart

@@ -1,7 +1,5 @@
 import 'dart:io';
-import 'package:ffmpeg_kit_flutter_new/ffmpeg_kit.dart';
-import 'package:ffmpeg_kit_flutter_new/ffmpeg_session.dart';
-import 'package:ffmpeg_kit_flutter_new/return_code.dart';
+import 'media/ffmpeg.dart';
 import 'package:path_provider/path_provider.dart';
 
 class VideoStitchingService {

sojorn_app/pubspec.lock

@@ -345,22 +345,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.4.1"
-  dio:
-    dependency: "direct main"
-    description:
-      name: dio
-      sha256: b9d46faecab38fc8cc286f80bc4d61a3bb5d4ac49e51ed877b4d6706efe57b25
-      url: "https://pub.dev"
-    source: hosted
-    version: "5.9.1"
-  dio_web_adapter:
-    dependency: transitive
-    description:
-      name: dio_web_adapter
-      sha256: "7586e476d70caecaf1686d21eee7247ea43ef5c345eab9e0cc3583ff13378d78"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.1.1"
   fake_async:
     dependency: transitive
     description:
@@ -1469,14 +1453,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.8"
-  pointycastle:
-    dependency: "direct main"
-    description:
-      name: pointycastle
-      sha256: "92aa3841d083cc4b0f4709b5c74fd6409a3e6ba833ffc7dc6a8fee096366acf5"
-      url: "https://pub.dev"
-    source: hosted
-    version: "4.0.0"
   pool:
     dependency: transitive
     description:

sojorn_app/pubspec.yaml

@@ -20,7 +20,6 @@ dependencies:
 
   # HTTP & API
   http: ^1.2.2
-  dio: ^5.7.0
 
   # UI & Utilities
   cupertino_icons: ^1.0.8
@@ -63,7 +62,6 @@ dependencies:
   # E2EE Cryptography
   cryptography: ^2.5.0
   convert: ^3.1.1
-  pointycastle: ^4.0.0
   file_picker: ^10.3.10
   universal_html: ^2.0.8