Add encrypted file messaging support (#367)

* send images using blossom server

* update dependencies

* add more files, pdf, txt, videos

* add documentation and improve send files UI

* use localized strings for file message actions

* Add validation for hex key length before parsing

* Sanitize filename to prevent path traversal

* remove unuced nonceHex parameter

* Avoid triggering side effects from build

* Eliminated code duplication

* HTTP Client Resource Leak Fixed

* Add secure file upload system with format restrictions and image sanitization

* sanitize files name

* update dependencies

* code rabbit sugestions

* Add a confirmation message before sending the file

* tap to open images

* coderabbit sugesions

* Add comprehensive file messaging tests

  - Add 31 tests covering encryption, validation, upload/download
  - Include edge cases and security validation

* fix tests

* Generated mocks for CI compatibility and coderabbit suggestion

* Improve gift wrap tests

* nitpick rabbit suggestions

* improve tests

* centralizing BlossomException to avoid multiple definitions

* centralizing Blossom server config

* missing file

* fix: remove duplicate code

* add translations and follow coderabbit sugests

* add Unicode normalization and robust JSON parsing for file messaging

Author: Catrya

android/app/build.gradle

@@ -112,6 +112,15 @@ flutter {
     source = "../.."
 }
 
+// Minimal AndroidX conflict resolution - only fix the specific build error
+configurations.all {
+    resolutionStrategy {
+        // Only force the problematic dependencies, not all AndroidX
+        force 'androidx.activity:activity:1.9.2'
+        force 'androidx.activity:activity-ktx:1.9.2'
+    }
+}
+
 dependencies {
     coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:2.1.4'
 }