v1.0.2: Mood mix optimizations and media player improvements

- Fixed player seek flicker on podcasts (30s skip buttons)
- Added dual-layer seek lock mechanism to prevent stale time updates
- Optimized cached podcast seeking (direct seek before reload fallback)
- Large skips now execute immediately for responsive feel
- Mood mix performance optimizations

backend/prisma/migrations/20251225100000_add_similar_artists_json/migration.sql

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+-- AddColumn: Artist.similarArtistsJson
+-- Stores full Last.fm similar artists data as JSON instead of FK-based SimilarArtist table
+ALTER TABLE "Artist" ADD COLUMN "similarArtistsJson" JSONB;

backend/prisma/migrations/20251226000000_add_mood_bucket_system/migration.sql

@@ -0,0 +1,58 @@
+-- Add MoodBucket table for pre-computed mood assignments
+CREATE TABLE "MoodBucket" (
+    "id" TEXT NOT NULL,
+    "trackId" TEXT NOT NULL,
+    "mood" TEXT NOT NULL,
+    "score" DOUBLE PRECISION NOT NULL,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "MoodBucket_pkey" PRIMARY KEY ("id")
+);
+
+-- Add UserMoodMix table for storing user's active mood mix
+CREATE TABLE "UserMoodMix" (
+    "id" TEXT NOT NULL,
+    "userId" TEXT NOT NULL,
+    "mood" TEXT NOT NULL,
+    "trackIds" TEXT[],
+    "coverUrls" TEXT[],
+    "generatedAt" TIMESTAMP(3) NOT NULL,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "UserMoodMix_pkey" PRIMARY KEY ("id")
+);
+
+-- Unique constraint: one entry per track+mood combination
+CREATE UNIQUE INDEX "MoodBucket_trackId_mood_key" ON "MoodBucket"("trackId", "mood");
+
+-- Index for fast mood lookups sorted by score
+CREATE INDEX "MoodBucket_mood_score_idx" ON "MoodBucket"("mood", "score" DESC);
+
+-- Index for track lookups
+CREATE INDEX "MoodBucket_trackId_idx" ON "MoodBucket"("trackId");
+
+-- Unique constraint: one mood mix per user
+CREATE UNIQUE INDEX "UserMoodMix_userId_key" ON "UserMoodMix"("userId");
+
+-- Index for user lookups
+CREATE INDEX "UserMoodMix_userId_idx" ON "UserMoodMix"("userId");
+
+-- Foreign key constraints
+ALTER TABLE "MoodBucket" ADD CONSTRAINT "MoodBucket_trackId_fkey" FOREIGN KEY ("trackId") REFERENCES "Track"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+ALTER TABLE "UserMoodMix" ADD CONSTRAINT "UserMoodMix_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- Add indexes to Track table for mood-related columns (for query optimization)
+CREATE INDEX IF NOT EXISTS "Track_analysisMode_idx" ON "Track"("analysisMode");
+CREATE INDEX IF NOT EXISTS "Track_moodHappy_idx" ON "Track"("moodHappy");
+CREATE INDEX IF NOT EXISTS "Track_moodSad_idx" ON "Track"("moodSad");
+CREATE INDEX IF NOT EXISTS "Track_moodRelaxed_idx" ON "Track"("moodRelaxed");
+CREATE INDEX IF NOT EXISTS "Track_moodAggressive_idx" ON "Track"("moodAggressive");
+CREATE INDEX IF NOT EXISTS "Track_moodParty_idx" ON "Track"("moodParty");
+CREATE INDEX IF NOT EXISTS "Track_moodAcoustic_idx" ON "Track"("moodAcoustic");
+CREATE INDEX IF NOT EXISTS "Track_moodElectronic_idx" ON "Track"("moodElectronic");
+CREATE INDEX IF NOT EXISTS "Track_arousal_idx" ON "Track"("arousal");
+CREATE INDEX IF NOT EXISTS "Track_acousticness_idx" ON "Track"("acousticness");
+CREATE INDEX IF NOT EXISTS "Track_instrumentalness_idx" ON "Track"("instrumentalness");