feat: extend-TTL, image pre-pull, and session UX

[nicholasadamou]

Second of the two follow-up PRs — the Features & UX batch (#7–#10). (Quality & DX follows in the next PR.)

Extend TTL (#7)

PATCH /api/sessions/:id pushes a running session's expiry to now + ttlSeconds (clamped 60–86400); the dashboard adds a +15m control. Because Docker labels are immutable and Airlock keeps no database, the extension is an in-memory override applied on read/prune — best-effort, single-node, reverts on API restart (documented in api.md/OpenAPI).

Image pre-pull (#9)

• createSession now ensures the image is present (pulls if missing), fixing a latent first-launch-on-a-fresh-host failure (createContainer doesn't auto-pull).
• POST /api/images/pull warms all configured images; the dashboard exposes a Pre-pull browser images action.

Clipboard / file bridge (#8) + share / reconnect (#10)

• Per-session Copy link button; viewer Reload stream (reconnect / re-accept cert) button.
• Clipboard sync and file upload/download are surfaced via the Kasm control bar (iframe clipboard-read/write perms set), documented in web.md.
• The per-session VNC password is shown beneath the stream.

Verification

• make check green: format, lint, typecheck, 97 tests (80 api + 17 web), build. New tests cover extendSession (incl. override-aware prune), pullBrowserImages, the PATCH/pull routes, and the web client methods.
• Docs: api.md, docs/openapi.yaml (validated), web.md updated.

Follow-up (final PR)

Quality & DX: tests for App/SessionList/SessionViewer, an opt-in real-container e2e, and OpenAPI drift protection.

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📥 Commits

Reviewing files that changed from the base of the PR and between dbaaf38 and 8cb18e5.

📒 Files selected for processing (16)

• apps/api/src/__tests__/_fakes.ts
• apps/api/src/__tests__/app.test.ts
• apps/api/src/__tests__/docker-session-runtime.test.ts
• apps/api/src/app.ts
• apps/api/src/docker-session-runtime.ts
• apps/api/src/schemas.ts
• apps/web/src/App.tsx
• apps/web/src/components/SessionList.tsx
• apps/web/src/components/SessionViewer.tsx
• apps/web/src/lib/api.test.ts
• apps/web/src/lib/api.ts
• apps/web/src/styles.css
• docs/api.md
• docs/openapi.yaml
• docs/web.md
• packages/shared/src/index.ts

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• Create PR with unit tests
• Commit unit tests in branch feat/features-ux

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