Add holiday promotion, snowflakes effect, and Spotify music widget

- Added holiday promotion banner with 2026WITHMARINARA discount code
- Added dismiss functionality for promotion with persistent state
- Implemented snowflakes animation effect with toggle
- Added Spotify music widget above chat input
- Widget matches extension theme colors and positioning
- Added Display Options toggles to show/hide feature toggles
- Improved responsive design and mobile support

src/systems/features/musicPlayer.js

@@ -0,0 +1,79 @@
+/**
+ * Music Player Module
+ * Handles parsing and storing Spotify URLs from AI responses
+ */
+
+import { extensionSettings, committedTrackerData } from '../../core/state.js';
+
+/**
+ * Extracts song suggestion from AI response in <spotify:Song - Artist/> format
+ * @param {string} responseText - The raw AI response text
+ * @returns {Object|null} Object with {song, artist, searchQuery} or null if not found
+ */
+export function extractSpotifyUrl(responseText) {
+    if (!responseText || !extensionSettings.enableSpotifyMusic) return null;
+
+    // Match <spotify:Song Title - Artist Name/> format
+    const songMatch = responseText.match(/<spotify:([^<>-]+)\s*-\s*([^<>\/]+)\/>/i);
+    if (songMatch) {
+        const song = songMatch[1].trim();
+        const artist = songMatch[2].trim();
+        const searchQuery = `${song} ${artist}`;
+        return {
+            song,
+            artist,
+            searchQuery,
+            displayText: `${song} - ${artist}`
+        };
+    }
+
+    return null;
+}
+
+/**
+ * Converts song data to Spotify app protocol URL
+ * @param {Object} songData - Object with {song, artist, searchQuery}
+ * @returns {string} Spotify app protocol URL
+ */
+export function convertToEmbedUrl(songData) {
+    if (!songData || !songData.searchQuery) return '';
+
+    // Use Spotify app protocol for direct app opening
+    const encodedQuery = encodeURIComponent(songData.searchQuery);
+    return `spotify:search:${encodedQuery}`;
+}
+
+/**
+ * Parses AI response for song suggestion and stores it
+ * @param {string} responseText - The raw AI response text
+ * @returns {boolean} True if song was found and stored
+ */
+export function parseAndStoreSpotifyUrl(responseText) {
+    if (!extensionSettings.enableSpotifyMusic) return false;
+
+    const songData = extractSpotifyUrl(responseText);
+    console.log('[RPG Companion] Spotify Parser: Found song:', songData);
+    if (songData) {
+        // Store in committed tracker data
+        committedTrackerData.spotifyUrl = songData;
+        console.log('[RPG Companion] Spotify Parser: Stored song in committedTrackerData:', committedTrackerData.spotifyUrl);
+        return true;
+    }
+
+    return false;
+}
+
+/**
+ * Gets the current song data from committed tracker data
+ * @returns {Object|null} Current song data or null
+ */
+export function getCurrentSpotifyUrl() {
+    return committedTrackerData.spotifyUrl || null;
+}
+
+/**
+ * Clears the current song data
+ */
+export function clearSpotifyUrl() {
+    committedTrackerData.spotifyUrl = null;
+}