Add full send + receive encrypted media support in desktop DM chat:
- Paperclip attach button and drag-and-drop in ChatPane (NIP-17 mode only)
- AES-GCM encryption before upload to Blossom server
- ChatMessageEncryptedFileHeaderEvent (kind 15) wrapped in GiftWrap
- sendNip17EncryptedFile() added to IAccount interface and implementations
- DesktopUploadOrchestrator.uploadEncrypted() with proper encrypted hash
- DesktopBlossomClient ByteArray upload overload for encrypted blobs
- LRU cache in EncryptedMediaService to avoid re-downloading
- Error handling: retry on failure, disable send during upload
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Post type toggle (Note vs Picture/kind 20) in compose dialog, only
shown when image files are attached. Text input disabled in picture mode.
- Fix LazyVerticalGrid crash in GalleryTab: bounded height via
fillParentMaxHeight() when nested inside LazyColumn.
- Phase 1 testing plan: all pass.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
When images are attached, a Note/Picture toggle appears letting the user
publish as kind 20 (PictureEvent) instead of kind 1. Text input is
disabled in picture mode. Selector only shows for image file types.
Updates testing plan: Phase 1 all pass.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
nrobi144