feat(web): gender-differentiated 4:5 covers + per-card styleGuide prebake

- Regenerate 60 covers (30 male + 30 female) via FLUX with story-specific
  prompts, replacing the prior gender-shared set
- Crop covers to 4:5 (960×1200) via sharp attention cover; matches new
  homepage card aspectRatio
- Persist all 60 prompts to public/home/prompts.json so the prebake step
  can reuse the cover's exact visual anchor (per-card styleGuide) and the
  first-act scene visually carries over from the poster the player clicked
- Restore /play?card= prebaked instant-play path on homepage card click
- Add OpenAI-compatible image route in ai-client for non-Runware endpoints
- Hide Next.js dev indicators globally; tweak F-key fullscreen label

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/globals.css

@@ -66,3 +66,16 @@
     opacity: 0;
   }
 }
+
+/* Hide Next.js dev compiler indicators and static overlays completely */
+next-route-announcer,
+nextjs-portal,
+#nextjs-dev-indicator,
+.nextjs-static-indicator,
+div[data-nextjs-toast-wrapper],
+div[data-nextjs-toast] {
+  display: none !important;
+  visibility: hidden !important;
+  opacity: 0 !important;
+  pointer-events: none !important;
+}