[Di7design]

The measure chart's <svg> extends into the right margin where y-axis labels render, so onmouseleave never fires when the cursor crosses from the plot onto a label. The mousemove handler kept hoverState.isHovered true (with clampX pinning the index to the plot edge) and the floating tooltip stayed visible.

• Treat any mousemove outside the plot bounds as a leave; clears the floating tooltip, the inline MeasureChartTooltip, and the top-left date readout.
• Run scrub updates first so a drag that strays into the margins keeps tracking.

Closes APP-890

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!

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Developed in collaboration with Claude Code

[nishantmonu51]

The branch is 431 commits behind main and this hunk conflicts textually with it (the aria-label i18n change plus the scrubController guard), so it needs a rebase before it can merge.

main has not made the fix redundant: its handler still sets hoverState.isHovered = true on every mousemove with no plot-bounds check, so the y-axis tooltip bug is still present there. Note also that the early return hides the tooltip over the x-axis labels in the bottom margin as well, which the PR body states is intended.

[nishantmonu51]

main has since made this prop optional — export let scrubController: ScrubController | undefined = undefined — and guards this same branch with scrubController && get(scrubController.state).isScrubbing, because ScreenshotContainer.svelte:163 renders MeasureChart without a controller and MeasureChart.svelte:381 forwards that undefined down. Hoisting the unguarded dereference to the top of the handler means that if this hunk's conflict is resolved by taking the PR side, svelte-check fails on the possibly-undefined access and, at runtime, any mousemove over a controller-less chart throws before the tooltip logic runs. Keep the scrubController && guard (or use scrubController?.state) when rebasing.