Four UIUX fixes for the workspace Events tab.
1. Hardcoded text-yellow-400 (DEGRADED) and text-purple-400
(AGENT_CARD_UPDATED) didn't theme-flip — read fine in dark mode,
washed out in warm-paper light. Switched DEGRADED → text-warm
(the semantic warm/amber token) and AGENT_CARD_UPDATED → text-
accent (informational metadata, accent is the right semantic).
2. Refresh button hover was a no-op (bg-surface-card on top of itself).
Lift to surface-elevated, matching the Cancel pattern from
ConfirmDialog. Added focus-visible ring.
3. Event expander rows had no aria-expanded — screen readers heard a
generic "button" with no indication it toggled. Added
aria-expanded + aria-controls pointing to the payload panel id.
4. Added focus-visible ring on each expander button. Hover bg added
too so the active row visibly responds.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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