feat(media): Phase 0+1 — Coil3 image loading + inline images in notes

- DesktopImageLoaderSetup: Coil3 with explicit memory cache (25% heap,
  max 512MB), persistent disk cache (OS-appropriate paths), SVG decoder
- DesktopBlurHashFetcher: blurhash placeholder images via Skia Bitmap
- DesktopBase64Fetcher: base64 data: URI image decoding
- SkiaGifDecoder: GIF first-frame rendering via Skia Codec
- MediaAspectRatioCache: thread-safe LruCache for aspect ratios
- NoteCard: inline AsyncImage for image URLs, stripped from text
- Added coil-compose, coil-okhttp, coil-svg, vlcj, commons-imaging,
  androidx-collection deps to desktopApp

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

desktopApp/build.gradle.kts

@@ -46,8 +46,20 @@ dependencies {
     // JSON
     implementation(libs.jackson.module.kotlin)
 
+    // Image loading (Coil3 — explicit because commons uses implementation, not api)
+    implementation(libs.coil.compose)
+    implementation(libs.coil.okhttp)
+    implementation(libs.coil.svg)
+
+    // Video playback
+    implementation(libs.vlcj)
+
+    // EXIF stripping (lossless)
+    implementation(libs.commons.imaging)
+
     // Collections
     implementation(libs.kotlinx.collections.immutable)
+    implementation(libs.androidx.collection)
 
     // SLF4J no-op — silence "No SLF4J providers" warnings from transitive deps
     implementation("org.slf4j:slf4j-nop:2.0.16")