Topic page: add identity accents to top cards

[AndreRobitaille]

Summary

Add subtle visual accents to Topic page sections to improve scanability and identity without overpowering content.

Requirements

• Use theme tokens and avoid heavy ornamentation.
• Focus on timeline cards, status panels, and key metrics.

Acceptance criteria

• Topic detail page feels deliberate and topic-first.

[AndreRobitaille]

Closing as already satisfied. Topic pages have deliberate visual hierarchy: section dividers with primary-color underlined titles, warm accent left borders on Coming Up cards, warm card variant for briefing headlines, raised surface for Record section, color-coded vote cards (green/red/muted), and semantic outcome badges on Key Decisions. The topic card partial has a distinct structured layout. Identity accents were built incrementally alongside the topic pages.