Remove flutter chat (#26)

Had to squash merge manually as Forgejo was erroring

pubspec.yaml

@@ -9,7 +9,13 @@ flutter:
   uses-material-design: true
 
 environment:
-  sdk: "3.11.4"
+  sdk: "3.11.5"
+
+dependency_overrides:
+  linkify:
+    git:
+      url: https://github.com/appelladev/linkify
+      ref: fix/consecutive-periods-loose-url
 
 dependencies:
   flutter:
@@ -32,12 +38,6 @@ dependencies:
       url: https://github.com/hasali19/flutter_dynamic_system_colors
   collection: 1.19.1
   window_manager: 0.5.1
-  flutter_chat_core: 2.9.0
-  flyer_chat_image_message: 2.3.0
-  flyer_chat_system_message: 2.2.0
-  flyer_chat_file_message: 2.4.0
-  flutter_chat_ui: 2.11.1
-  flutter_link_previewer: 4.2.0
   color_hash: 1.0.1
   flutter_widget_from_html_core: 0.17.2
   flutter_svg: 2.3.0
@@ -54,9 +54,15 @@ dependencies:
   timeago: 3.7.1
   http: 1.6.0
   flutter_linkify: 6.0.0
+  linkify: 5.0.0
   emoji_text_field:
     git:
       url: https://github.com/Henry-Hiles/emoji_text_field
+  flutter_blurhash: 0.9.1
+  super_sliver_list: 0.4.1
+  media_kit: 1.2.6
+  media_kit_video: 2.0.1
+  media_kit_libs_video: 1.0.7
   
 dev_dependencies:
   build_runner: 2.15.0