doberkofler / gantt-renderer / 25539858367

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fix: correct link routing geometry and dependency layer rendering

linkRouter fixes:
- collapseStubs: track last kept point instead of original predecessor
- getAnchors: extract with exhaustiveness guard (never) for compile-time safety
- routeSameRow: use Math.abs for float-safe direct-line check, add above param
- routeMultiRow: clamp crossX to prevent over-extension on same-side exit/entry (SS/FF)
- Increase TURN_MARGIN 12→24 px to match visual arrowhead approach clearance
- Add STUB_THRESHOLD (2 px) for near-zero segment collapse

dependencyLayer fixes:
- refX: '9' → '10' to eliminate 0.6 px arrowhead overshoot
- stroke-dasharray: remove attribute instead of setting 'none' (invalid value)
- Snapshot svg.children to static array before mutation
- Insert link paths before ghost line to keep ghost painted topmost
- Extract ARROW_PATH constant, add data-link-id, clean up dead optional chains
- Remove redundant width/height from createDependencyLayer

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