feat: judge shortcuts, CSV export, print sheet

[AlonsoAlviraa]

Stacked on cursor/verifleet-c2-console-b4ae. Honest, small judge-facing additions on /fleet only.

Features

1. Keyboard shortcuts on /fleet

   • 1–4 dispatch the four fixtures (same handlers as the Dispatch buttons)
   • u focuses the PDF dropzone
   • g toggles Background 202
   • ? (or the Shortcuts chip) opens a cheatsheet overlay; Esc / backdrop / ? closes it
   • Mouse Dispatch, drop, and sweep are unchanged. Shortcuts ignore typing in inputs/selects and no-op 1–4 while a run is busy.

2. Export CSV

   • Client-side from already-fetched session runs
   • Columns: run_id, verdict, hash (truncated first8…last8, empty if none), reason
   • Button label: Export CSV / Exportar CSV
   • Does not invent hashes or call a new API

3. Print stylesheet for /fleet

   • Judge sheet: banner, last result, Stage One checklist, identity
   • @media print hides app nav/footer, fixtures, ingest, recent runs, roster
   • No PEM, no fake AEAT send, no invented Cloud Run URL

4. CLI docs only

   • python -m verifleet ingest already exists on the stacked branch — not duplicated
   • README (EN + ES) now shows python -m verifleet ingest --help plus JSON/PDF examples

ES/EN strings added for the new UI. Existing Paper-related files were not present; locale toggle and 390px layout are preserved (cheatsheet max-w-[390px], control chips wrap).

Non-goals

• No chatbot
• No live Hacienda / AEAT remittance (chip stays “not on fleet path”)
• The LLM still never writes the hash
• No fake SENT_OK
• No invented Cloud Run URL
• No PEM paste or certificate upload
• No new ingest CLI implementation

Verification

• cd frontend && npm run build — green (Next.js 16.1.1, TypeScript included)
• python3 -m verifleet ingest --help — existing CLI, docs only; no CLI code change so no new pytest