feat(chat): enhance chat functionality with song integration and UI improvements

- Updated ChatHeader and ChatMessage components to support song selection and display.
- Enhanced useContentPanel to handle both film and song content, allowing for richer interactions.
- Improved FilmCard and added SongCard components for better media representation.
- Refactored environment variables for better configuration management.
- Updated .gitignore to include development chat history.

Made-with: Cursor

packages/core/src/types/content.ts

@@ -33,3 +33,22 @@ export interface FilmRendererData {
   query?: string
   totalResults?: number
 }
+
+export interface SongSource {
+  type: 'plex' | 'spotify' | 'youtube' | 'apple-music' | 'bandcamp'
+  name: string
+  url: string
+  icon?: string
+}
+
+export interface Song {
+  id: string
+  title: string
+  artist: string
+  album?: string
+  year?: number
+  coverUrl?: string
+  duration?: number
+  genres?: string[]
+  sources?: SongSource[]
+}