Fixed the ui-ux changes.

[krishna9358]

Summary

1. Fix node positions overlapping in Execute mode
   Issue: When switching from Design to Execute mode, workflow nodes would overlap and appear in incorrect positions instead of maintaining their layout.
   Solution: Fixed stale closure issue in Canvas.tsx where fitView was using outdated node positions. Changed to use reactFlowInstance.getNodes() to get current node positions instead of relying on the stale closure.
   File: frontend/src/components/workflow/Canvas.tsx

2. Disable Rerun button while workflow is running
   Issue: The "Rerun" button in the execution sidebar was enabled while the workflow was still running, which could cause confusion.
   Solution: Added disabled state to Rerun buttons when the run is still in progress (live/running status). Also added tooltip explaining "Wait for run to complete".
   Files:
   frontend/src/components/timeline/RunSelector.tsx
   frontend/src/components/timeline/ExecutionInspector.tsx

3. Fix scroll behavior on workflow nodes
   Issue: When mouse is over a workflow component with scrollable content (error panel, text blocks, validation dock), scrolling with mouse wheel would zoom the canvas instead of scrolling the content.
   Solution: Added onWheel={(e) => e.stopPropagation()} to scrollable elements to prevent wheel events from bubbling up to React Flow canvas.
   Files:
   frontend/src/components/workflow/ExecutionErrorView.tsx
   frontend/src/components/ui/markdown.tsx
   frontend/src/components/workflow/ValidationDock.tsx

Testing

• bun run test
• bun run lint
• bun run typecheck
• Additional notes:

Documentation

• Updated the relevant doc(s) (see docs/guide.md) or checked that no updates are needed.
• Recorded contract/architecture changes in both public docs and .ai logs when applicable.

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[betterclever]

LGTM. All three fixes match their descriptions:

1. ✅ Canvas stale closure fix - good detailed comment explaining the issue
2. ✅ Rerun button disabled during live runs - works in both components
3. ✅ Scroll stopPropagation to prevent canvas zoom

Minor note: is now duplicated between RunSelector.tsx and ExecutionInspector.tsx, but that's fine for a follow-up refactoring.

[betterclever]

LGTM. All three fixes match their descriptions. Canvas stale closure fix, Rerun button disabled during live runs, and scroll stopPropagation to prevent canvas zoom. Minor note: isRunLive is now duplicated between RunSelector.tsx and ExecutionInspector.tsx, but that's fine for a follow-up refactoring.