Fix route diagram open issues: bugs, visual polish, interactive features
Batch 1 — Bug fixes:
- #51: Pass group+routeId to stats/timeseries API for route-scoped data
- #55: Propagate processor FAILED status to diagram error node highlighting
Batch 2 — Visual polish:
- #56: Brighter canvas background with amber/cyan radial gradients
- #57: Stronger glow filters (stdDeviation 3→6, opacity 0.4→0.6)
- #58: Uniform 200×40px leaf nodes with label truncation at 22 chars
- #59: Diagram legend (node types, edge types, overlay indicators)
- #64: SVG <title> tooltips on all nodes showing type, status, duration
Batch 3 — Interactive features:
- #60: Draggable minimap viewport (click-to-center, drag-to-pan)
- #62: CSS View Transitions slide animation, back arrow, Backspace key
Batch 4 — Advanced features:
- #50: Execution picker dropdown scoped to group+routeId
- #49: Iteration count badge (×N) on compound nodes
- #63: Route header stats (Executions Today, Success Rate, Avg, P99)
Closes #49 #50 #51 #55 #56 #57 #58 #59 #60 #62 #63 #64
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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