✨ feat(frontend): Storybook + auto-generated Playwright e2e docs with screenshots (#30)

Storybook 8 + Playwright JSON reporter + auto-generated markdown docs with embedded screenshots and breadcrumbs. Frontend PRs now reviewable from Gitea web UI. ~95% Mistral autonomous via ICM workspace, trainer commit/PR (Mistral hit turn limit).

Co-authored-by: Gabriel Radureau <arcodange@gmail.com>
Co-committed-by: Gabriel Radureau <arcodange@gmail.com>

frontend/docs/e2e/README.md

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+# E2E Test Reports
+
+[<- Up to docs](../README.md)
+
+| Test | Status | Duration |
+|------|--------|----------|
+| [home page loads and shows server health info](./home-page-loads-and-shows-server-health-info.md) | PASSED | 168ms |

frontend/docs/e2e/home-page-loads-and-shows-server-health-info.md

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+# home page loads and shows server health info
+
+[<- Back to index](./README.md) | [Top](../README.md)
+
+**File**: `tests/e2e/health.spec.ts`
+**Status**: PASSED
+**Duration**: 168ms
+
+## Screenshot
+
+![home page loads and shows server health info](../../tests/e2e/screenshots/home-page-loads-and-shows-server-health-info.png)
+
+## Test Details
+
+- Start Time: 2026-05-03T14:38:42.958Z
+- Spec File: health.spec.ts