v1.7.6 — UI v2 polish + operator ergonomics

What's new in v1.7.6

UI v2 — Timeline

• Clickable histogram bars now filter events by time window (?from=X&to=Y)
• Contextual "why it matters" hints on row details (threat/borderline/trusted classification)
• ✦ AI explain trigger on timeline row details
• v2FilterTimelineEvents with proper time-range support
• Cleaner action list (removed stale v1 /forensic link)

UI v2 — Investigate

• "Pivot to" card with quick links to Timeline, Cloudflare, Notes, and add-note-for-this-IP
• Back-navigation banner when arriving from timeline filter

UI v2 — Notes

• Type selector (IP address / ASN / Domain / Other) replacing hardcoded hidden input
• Note count pill in card header
• Improved empty state with actionable hint
• Ctrl+K shortcut hint below Save button
• "View all N notes" link when list is truncated

UI v2 — Freshness

• data-ts attributes added across audit rows, dashboard live tail, providers posture meta, and Cloudflare sync badge
• freshness.js — live relative-time updates for all data-ts elements (refreshes every 30s)

UI v2 — Navigation & Feedback

• nav-progress.js — body .v2-loading class applies skeleton shimmer on .v2-card during page transitions
• Palette — g+c (Cloudflare), g+n (Notes), g+a (Audit) shortcuts; recent-IPs stored in localStorage
• Operator live script — complete v2 route map; j/k/Enter keyboard navigation for <details> rows

Fixes

• Updated stale test assertions (removed /forensic v1 link expectation, verified data-ts presence)

Closes #160 #161 #162 #163 #164 #165 #166 #167 #168 #169 #172 #173 #174 #175 #176 #178