feat(ui): improve duration display in workflow and execution tables

[santoshkumarradha]

Summary

Closes #222

• Human-readable durations: Replace raw seconds (3748.3s) with natural format (1h 2m, 17m 32s, 230ms)
• Live elapsed timer: Running items now show a live-updating timer that ticks every second instead of a static - dash
• Shared utility: Consolidated duration formatting into formatDurationHumanReadable() and LiveElapsedDuration component in data-formatters.tsx

Changes

New shared utilities (data-formatters.tsx)

• formatDurationHumanReadable(ms) — Formats milliseconds to human-readable: 230ms, 42s, 3m 28s, 1h 2m, 1d 2h
• LiveElapsedDuration — React component with useEffect/setInterval that computes elapsed time from startedAt and ticks every second

Updated table components

• WorkflowsTable.tsx — Duration column now uses human-readable format + live timer for running workflows
• CompactWorkflowsTable.tsx — Same improvements for compact variant
• CompactExecutionsTable.tsx — Duration column now uses client-side formatting + live timer for running executions
• EnhancedExecutionsTable.tsx — Same improvements for enhanced variant

Bonus fix

• Removed as any type assertion in CompactExecutionsTable status prop, replaced with proper normalizeExecutionStatus() call

Duration Format Examples

Before	After
3748.3s	1h 2m
1208.5s	20m 8s
426.0s	7m 6s
0.1s	123ms
- (running)	2m 34s (live, ticking)

Screenshots (Playwright)

Workflows Table (After)

Executions Table (After)

Verification

• npx tsc --noEmit — passes
• npm run build — passes
• LSP diagnostics clean on all 5 changed files
• Playwright screenshot verification against local control plane with real data