fix(style): the style's generation prompt never reached the user

[catomean]

The bug

Picking an art style stored style_id and lit a progress checkmark. That was the entire effect.

prompt_template and negative_prompt are seeded on every style row, declared on the Style type, and already shipped to the browser on every project page — GET /api/projects/[id] joins style:styles(*). They were then read by nothing.

Meanwhile the figures step told the user, in its own words:

Use an AI tool (Grok, Midjourney) to generate a styled version

…and never showed the prompt the style was written for. In Phase 1 the styled image is produced by hand and uploaded back, so that instruction is the handoff from app to human — and it was empty. Every figure got whatever prompt its user happened to recall.

Figures only merge into one scene when they were all generated the same way, so a per-figure prompt typed from memory is a Ground Truth #3 failure ("Style consistency across all figures… if any element feels pasted in, the illusion breaks"), not a missing convenience.

The fix

The figures step now shows the chosen style's prompt and negative prompt with copy buttons, and links to the style step when no style is chosen yet.

The prompt is rendered exactly as stored. The seeded templates carry no {placeholders} despite the data-model doc saying they might, so there is no substitution to do and none is invented (YAGNI).

No API, schema, or hook change — the data was already on the wire.

Why the guard is narrow

Same shape as the orphaned /api/compositions route fixed in #25, one level down: there a route with no caller, here a column with no reader.

A blanket "every modelled column is rendered somewhere" check would have to allowlist all of Export, face_embedding and face_confidence — deliberately unbuilt Phase 2/T2 surface — so it would be noise, not a gate. Per the never-twice rule this is the second sighting of the family: recorded as a pattern, automated only if it recurs.

Verification

• Root pnpm run verify green: format + lint (0 errors, 8 pre-existing warnings) + tsc + 101 tests, up from 98
• Production-parity next build green using CI's placeholder env
• New guard mutation-verified: reverting the wiring fails all three of its assertions

Not verified: the panel rendered in a real browser against real data. Local app/.env.selfhost.local (git-ignored, untracked) points at hosted Supabase ref ckpynkpsfnuqndplaapc, which is NXDOMAIN from a public resolver, while production is built against self-hosted https://supabase.orangecat.ch and is healthy (GET /api/projects → {"success":true,...}). Guest mode needs the service-role key, which this session does not have.

🤖 Generated with Claude Code

https://claude.ai/code/session_01SZGjXtzLGk2q9zPUkA3vMf