feat(chat): add inline video player component and modal viewer (#722) (#732)

* feat(chat): add inline video player component and modal viewer

Closes #722

* feat(chat): modernize video player with compact lock pill, save, and share

* refactor(chat): simplify inline video thumbnail to launch fullscreen player on tap

* fix(chat): pass session cookie and auth token headers to VideoView for protected media playback

* fix(chat): format unquoted cookie header for VideoView auth

* fix(chat): resolve video URLs via resolveImageUrl for gateway-hosted media

app/src/main/java/com/m57/hermescontrol/data/model/Attachment.kt

@@ -35,6 +35,13 @@ data class Attachment(
                 uri.contains(".gif", ignoreCase = true) ||
                 uri.startsWith("data:image/gif", ignoreCase = true)
 
+    val isVideo: Boolean
+        get() =
+            mimeType.startsWith("video/") ||
+                fileExtension in listOf("mp4", "webm", "mkv", "mov", "avi", "3gp") ||
+                uri.contains(".mp4", ignoreCase = true) ||
+                uri.contains(".webm", ignoreCase = true)
+
     val isGateway: Boolean
         get() = source == AttachmentSource.GATEWAY