Fix public dashboard layout

[brendohxd]

What changed

• close the workspace summary grid before the roadmap and pilot sections
• replace the dense two-column roadmap wall with a single milestone timeline
• expand the current milestone by default while keeping every milestone fully expandable
• retain every roadmap item and expose rationale, next actions, blockers, states, and evidence links
• replace the task table with labeled task cards at every viewport
• regenerate the GitHub Pages bundle

Root cause

The roadmap and pilot sections were accidentally nested inside the summary grid. Beyond that rendering defect, the original layout gave summary and detailed information equal visual weight, making current status difficult to interpret.

Impact

The dashboard now answers where the project is and what happens next first, while preserving the complete underlying detail through expandable milestones. Task state, risk, counts, policy status, transition history, and every gate remain visible.

Validation

• npm run check (21 tests passing)
• desktop visual verification at the default viewport
• mobile visual verification at 390 x 844
• no horizontal overflow
• generated Pages bundle confirmed current