fix: replace open_file_plus with native Kotlin MethodChannel for APK install

open_file_plus 3.4.1 uses deprecated PluginRegistry.Registrar API incompatible
with current Flutter. Replaced with a MethodChannel in MainActivity.kt that calls
FileProvider.getUriForFile() and launches the system package installer directly.

Also rework chat_input: 4px border radius on desktop, vPad 18px, 56px send button.

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

android/app/src/main/kotlin/chat/pyramid/pyramid/MainActivity.kt

@@ -1,5 +1,51 @@
 package chat.pyramid.pyramid
 
+import android.content.Intent
+import android.net.Uri
+import android.os.Build
+import androidx.core.content.FileProvider
 import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugin.common.MethodChannel
+import java.io.File
 
-class MainActivity : FlutterActivity()
+class MainActivity : FlutterActivity() {
+    private val channel = "chat.pyramid.pyramid/install"
+
+    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
+        super.configureFlutterEngine(flutterEngine)
+        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, channel)
+            .setMethodCallHandler { call, result ->
+                if (call.method == "installApk") {
+                    val path = call.argument<String>("path")
+                    if (path == null) {
+                        result.error("INVALID_ARG", "path is null", null)
+                        return@setMethodCallHandler
+                    }
+                    try {
+                        val file = File(path)
+                        val uri: Uri = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+                            FileProvider.getUriForFile(
+                                this,
+                                "${applicationContext.packageName}.fileprovider",
+                                file
+                            )
+                        } else {
+                            Uri.fromFile(file)
+                        }
+                        val intent = Intent(Intent.ACTION_VIEW).apply {
+                            setDataAndType(uri, "application/vnd.android.package-archive")
+                            addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+                            addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+                        }
+                        startActivity(intent)
+                        result.success(null)
+                    } catch (e: Exception) {
+                        result.error("INSTALL_ERROR", e.message, null)
+                    }
+                } else {
+                    result.notImplemented()
+                }
+            }
+    }
+}

lib/features/chat/chat_input.dart

@@ -43,11 +43,7 @@ class _ChatInputState extends State<ChatInput> {
     if (text.isEmpty) return;
     _ctrl.clear();
     setState(() => _canSend = false);
-
-    await widget.room.sendTextEvent(
-      text,
-      inReplyTo: widget.replyTo,
-    );
+    await widget.room.sendTextEvent(text, inReplyTo: widget.replyTo);
     widget.onClearReply?.call();
   }
 
@@ -59,21 +55,30 @@ class _ChatInputState extends State<ChatInput> {
             defaultTargetPlatform == TargetPlatform.linux ||
             defaultTargetPlatform == TargetPlatform.macOS);
 
+    // Desktop: taller bar, 4px square corners, bigger button
+    // Mobile: compact bar, pill shape, smaller button
+    final fieldRadius = isDesktop ? 4.0 : 20.0;
+    final btnSize = isDesktop ? 56.0 : 44.0;
+    final btnRadius = isDesktop ? 6.0 : 12.0;
+    final iconSize = isDesktop ? 24.0 : 20.0;
+    final fontSize = isDesktop ? 15.0 : 14.0;
+    final vPad = isDesktop ? 18.0 : 10.0;
+    final hPad = isDesktop ? 16.0 : 14.0;
+    final outerPad = isDesktop
+        ? const EdgeInsets.fromLTRB(12, 10, 12, 12)
+        : const EdgeInsets.fromLTRB(8, 4, 8, 8);
+
     return SafeArea(
       child: Column(
         mainAxisSize: MainAxisSize.min,
         children: [
-          if (widget.replyTo != null) _ReplyBar(
-            event: widget.replyTo!,
-            onClear: widget.onClearReply ?? () {},
-          ),
-          Padding(
-            padding: EdgeInsets.fromLTRB(
-              isDesktop ? 12 : 8,
-              isDesktop ? 10 : 4,
-              isDesktop ? 12 : 8,
-              isDesktop ? 14 : 8,
+          if (widget.replyTo != null)
+            _ReplyBar(
+              event: widget.replyTo!,
+              onClear: widget.onClearReply ?? () {},
             ),
+          Padding(
+            padding: outerPad,
             child: Row(
               crossAxisAlignment: CrossAxisAlignment.end,
               children: [
@@ -83,19 +88,24 @@ class _ChatInputState extends State<ChatInput> {
                     minLines: 1,
                     maxLines: 6,
                     textCapitalization: TextCapitalization.sentences,
-                    style: TextStyle(fontSize: isDesktop ? 16 : 14),
+                    style: TextStyle(fontSize: fontSize),
                     decoration: InputDecoration(
                       hintText: 'Nachricht...',
-                      hintStyle: TextStyle(
-                        fontSize: isDesktop ? 16 : 14,
-                        color: theme.colorScheme.onSurface.withAlpha(100),
-                      ),
+                      hintStyle: TextStyle(fontSize: fontSize),
                       contentPadding: EdgeInsets.symmetric(
-                        horizontal: isDesktop ? 22 : 16,
-                        vertical: isDesktop ? 20 : 10,
+                        horizontal: hPad,
+                        vertical: vPad,
                       ),
                       border: OutlineInputBorder(
-                        borderRadius: BorderRadius.circular(isDesktop ? 16 : 24),
+                        borderRadius: BorderRadius.circular(fieldRadius),
+                        borderSide: BorderSide.none,
+                      ),
+                      enabledBorder: OutlineInputBorder(
+                        borderRadius: BorderRadius.circular(fieldRadius),
+                        borderSide: BorderSide.none,
+                      ),
+                      focusedBorder: OutlineInputBorder(
+                        borderRadius: BorderRadius.circular(fieldRadius),
                         borderSide: BorderSide.none,
                       ),
                       filled: true,
@@ -113,18 +123,18 @@ class _ChatInputState extends State<ChatInput> {
                   onTap: _canSend ? _send : null,
                   child: AnimatedContainer(
                     duration: const Duration(milliseconds: 150),
-                    width: isDesktop ? 60 : 44,
-                    height: isDesktop ? 60 : 44,
+                    width: btnSize,
+                    height: btnSize,
                     decoration: BoxDecoration(
                       color: _canSend
                           ? theme.colorScheme.primary
                           : theme.colorScheme.primary.withAlpha(70),
-                      borderRadius: BorderRadius.circular(isDesktop ? 16 : 14),
+                      borderRadius: BorderRadius.circular(btnRadius),
                     ),
                     child: Center(
                       child: Icon(
                         Icons.send_rounded,
-                        size: isDesktop ? 26 : 20,
+                        size: iconSize,
                         color: Colors.white,
                       ),
                     ),

lib/widgets/update_download_dialog.dart

@@ -1,9 +1,9 @@
 import 'dart:io';
 
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:http/http.dart' as http;
-import 'package:open_file_plus/open_file_plus.dart';
 import 'package:path/path.dart' as p;
 import 'package:path_provider/path_provider.dart';
 import 'package:pyramid/core/theme.dart';
@@ -111,27 +111,28 @@ class _UpdateDownloadDialogState extends ConsumerState<_UpdateDownloadDialog>
     }
   }
 
+  static const _installChannel =
+      MethodChannel('chat.pyramid.pyramid/install');
+
   Future<void> _install(File file) async {
     setState(() => _state = _DownloadState.installing);
 
-    if (Platform.isWindows) {
-      await Process.start(file.path, [], runInShell: false);
-      if (mounted) Navigator.of(context).pop();
-      exit(0);
-    } else if (Platform.isAndroid) {
-      final result = await OpenFile.open(
-        file.path,
-        type: 'application/vnd.android.package-archive',
-      );
+    try {
+      if (Platform.isWindows) {
+        await Process.start(file.path, [], runInShell: false);
+        if (mounted) Navigator.of(context).pop();
+        exit(0);
+      } else if (Platform.isAndroid) {
+        await _installChannel
+            .invokeMethod('installApk', {'path': file.path});
+        if (mounted) setState(() => _state = _DownloadState.done);
+      }
+    } catch (e) {
       if (mounted) {
-        if (result.type == ResultType.done) {
-          setState(() => _state = _DownloadState.done);
-        } else {
-          setState(() {
-            _state = _DownloadState.error;
-            _errorMsg = result.message;
-          });
-        }
+        setState(() {
+          _state = _DownloadState.error;
+          _errorMsg = e.toString().split('\n').first;
+        });
       }
     }
   }

pubspec.lock

@@ -757,14 +757,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "9.3.0"
-  open_file_plus:
-    dependency: "direct main"
-    description:
-      name: open_file_plus
-      sha256: "01ad7011d46d253aa22e5f0bc7345ca49cfe652c50ae9b0af945491c1728a8c3"
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.4.1+1"
   package_config:
     dependency: transitive
     description:

pubspec.yaml

@@ -57,7 +57,6 @@ dependencies:
   # File handling
   file_picker: ^8.1.7
   desktop_drop: ^0.4.4
-  open_file_plus: ^3.4.1
 
   # Media playback
   media_kit: ^1.1.11