ui: brutalist restyle — paper/ink/amber

[emp3thy]

Summary

• Port the website's brutalist visual system to the management UI: cream paper / ink / single amber accent. Sharp corners, hairline rules, no shadows.
• Type swap from Fraunces / Bricolage Grotesque / Geist Mono → Inter ExtraBold (display) + JetBrains Mono (body, data). Loaded via Google Fonts.
• Reflection rows restructured: title spans the full row width above a foot row with use-cases + badges. Confidence bar removed; obs count and confidence % now stack as a tiny right-aligned data column (6 obs / 90% con).
• Rail labels remain capitalized in the DOM (CSS handles the lowercase rendering) so Playwright has_text="Episodes" etc. continue to match textContent — no test churn.
• End-to-end CSS rewrite covering rail, episodes, observations, reflections, semantic, drawer, diagnostics (hook errors, retention runs), modal, synth halo, htmx indicator, hint list, audit log.

Test plan

• uv run pytest tests/ui — 164 passed, 0 failed
• Manual visual sweep: episodes timeline, reflection list with use-cases visible, an open episode drawer, an open reflection drawer, observations tab, semantic tab, diagnostics tab
• Synthesis halo animation when running synthesize from the reflections panel
• Modal + edit form (reflection edit, semantic edit/create)
• Mobile / narrow viewport (rail collapses to top bar at <720px)

🤖 Generated with Claude Code

[github-actions]

🟢 Claude BugBot Analysis

This PR is a pure visual redesign (dark editorial theme → brutalist paper/ink/amber theme) touching CSS variables, font declarations, and minor HTML template restructuring. All CSS cascade rules are internally consistent, the reflection_row.html template restructuring matches the corresponding new CSS selectors, font weights requested from Google Fonts cover all values referenced in the CSS, and the specificity of override rules (.collapse-me, .close-drawer, .collapse-me:hover, etc.) is correct throughout. No logic errors, security vulnerabilities, or functional regressions were identified in the changed lines.

No bugs were detected in this PR.