feat(shorts): cinematic v2 visual design + synced karaoke captions

- Fix critical bug: scenes were stacked without <Sequence> — every segment
  rendered simultaneously, last scene covering the whole video (root cause
  of 'too simple/ugly' visual)
- Scene variety: kinetic word-by-word title (hook), karaoke caption card,
  big-number stat scene (auto-detected: $12B, 65%, 3.2M), CTA center
- Karaoke captions synced to TTS: edge-tts SentenceBoundary timing via new
  scripts/tts-words.py (mp3 + sentences.json per segment); active sentence
  bright, others dimmed
- Rich background per scene: 4 color palettes (indigo/pink, cyan/teal,
  purple/pink, orange/red), drifting orbs, dot grid, ken-burns motion
- Real fonts: @fontsource Inter 700 + Montserrat 800 (display/captions)
- Glass card captions, progress bar per-scene, safe zone 900x1400
- Word-boundary truncation for stat labels (no mid-word cuts)
- Perf kept: no blur/SVG-noise (software renderer); ~2 min per 32s short

package-lock.json

@@ -10,6 +10,8 @@
       "hasInstallScript": true,
       "dependencies": {
         "@auth/prisma-adapter": "^1.6.0",
+        "@fontsource/inter": "^5.3.0",
+        "@fontsource/montserrat": "^5.3.0",
         "@prisma/client": "^6.19.2",
         "@remotion/cli": "^4.0.527",
         "@remotion/google-fonts": "^4.0.527",
@@ -1047,6 +1049,24 @@
         "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       }
     },
+    "node_modules/@fontsource/inter": {
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/@fontsource/inter/-/inter-5.3.0.tgz",
+      "integrity": "sha512-RofMylZmjlJEfELXeNHFWBRcSs75rGU/6bV2S2jfnvv/3rPXPGe0LgUJTklcHZ9lM4OZmAVFhcJPnACfb91A3g==",
+      "license": "OFL-1.1",
+      "funding": {
+        "url": "https://github.com/sponsors/ayuhito"
+      }
+    },
+    "node_modules/@fontsource/montserrat": {
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/@fontsource/montserrat/-/montserrat-5.3.0.tgz",
+      "integrity": "sha512-iQPDtZOnmM5ih4JBGaMSXisRap0ixb9bAUw2hDtY7EjVfaqiiNlKtVuJl9XclxUwtwMMHNcWXfQR6zI9x05+Tg==",
+      "license": "OFL-1.1",
+      "funding": {
+        "url": "https://github.com/sponsors/ayuhito"
+      }
+    },
     "node_modules/@grammyjs/types": {
       "version": "3.28.0",
       "resolved": "https://registry.npmjs.org/@grammyjs/types/-/types-3.28.0.tgz",