Walks the real UI end-to-end:
1. Creates + registers a workspace on the platform
2. Opens the detail side panel
3. Clicks the Files tab (force-click since it's in an overflow-x bar)
4. Asserts all 3 split components render:
- FilesToolbar: "+ New" + "Upload" buttons
- FileTree: the config.yaml seeded by the default template
- FileEditor: "Select a file to edit" empty-state
Saves screenshots at /tmp/filestab-{1,2,3}-*.png for manual review.
Run: cd canvas && npx playwright test e2e/filestab-smoke.spec.ts
Requires platform on :8080 + canvas on :3000.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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