ui: improve Compose stability and message UI

- Add minute/second abbreviations and kotlin.time-based relative time formatter
- Introduce FastPreview and update previews to use AppTheme with dark/dynamic colors
- Refactor attachments preview grid & waveform to use ImmutableList and reduce recompositions
- Tweak message bubble reply styling and swipe-to-reply animation/haptics
- Add Compose Stability Analyzer plugin and enable it in debug builds
- Cache shared images by sha256 and improve share intent/chooser text
- Minor UX polish (e.g., “No views”) and immutability annotations

app/src/main/kotlin/dev/meloda/fast/common/AppGlobal.kt

@@ -4,6 +4,8 @@ import android.app.Application
 import androidx.preference.PreferenceManager
 import coil.ImageLoader
 import coil.ImageLoaderFactory
+import com.skydoves.compose.stability.runtime.ComposeStabilityAnalyzer
+import dev.meloda.fast.auth.BuildConfig
 import dev.meloda.fast.common.di.applicationModule
 import dev.meloda.fast.datastore.AppSettings
 import org.koin.android.ext.android.get
@@ -20,6 +22,8 @@ class AppGlobal : Application(), ImageLoaderFactory {
         AppSettings.init(preferences)
 
         initKoin()
+
+        ComposeStabilityAnalyzer.setEnabled(BuildConfig.DEBUG)
     }
 
     private fun initKoin() {