Index Line Zoom

[camdnnn]

Description
Fixed bug where index lines where being displayed outside chart bounds when after zooming

Changes
List the main changes made in this PR:

• Hide index line when outside chart bounds
• Fix index to not go outside limits

Screenshots (if applicable)
Add screenshots to show the changes (if any).

Additional Notes
Any other things of note, could include bugs, new warnings, or other things changed that do not concern the main PR content.

[Copilot]

Pull request overview

Fixes an index-overlay rendering issue during chart zoom by preventing the index indicator from being displayed outside the visible (zoomed) plot area, and aligns replay progress indexing with the actual emitted datapoint.

Changes:

• Adjust replay progress events to emit the processed datapoint’s index (instead of the next index).
• Hide the index line and dots when the computed x-position falls outside the zoomed grid bounds.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
frontend/src/utils/ReplayController.ts	Emits currentIndex consistent with the data point emitted during playback.
frontend/src/components/graph2D/indexOverlay/IndexOverlay.tsx	Adds in-bounds check to hide index visuals when outside the zoomed chart grid.

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