fix(dashboard): fix sidebar nav hover highlight snap-back

[alx-xo]

Summary

This fixes some slight bugs with how the hover slider was behaving. Main one was it would snap back to the the last place if you hovered too long and then went to the next item. The other minor one was if you moved too fast it wouldn't register and the slider would never move

---

• Moved setHoveredItem(null) from individual item onMouseLeave to the container div's onMouseLeave — highlight now stays on the last-hovered item while moving between items, and only returns to the active route when the mouse leaves the sidebar entirely
• Reduced settle poll interval from 100ms → 50ms for snappier response
• Fixed edge zone deadlock: CENTER_ZONE was blocking the settle trigger even when the mouse was fully stopped at the edge of an item — now bypassed when dy === 0

Root cause

Each nav item's onMouseLeave called setHoveredItem(null) immediately, snapping the sliding highlight back to the active route before the next item could settle. Because the settle interval takes up to 100ms to fire, this created a visible snap-to-active → slide-to-new-item sequence on every transition. Separately, the CENTER_ZONE edge exclusion had no escape hatch for a stopped mouse, causing the highlight to never trigger when the mouse landed precisely at the top or bottom of an item.

Test plan

• Hover between nav items — highlight slides smoothly without snapping back to active route
• Move mouse quickly to a nav item and stop — highlight triggers within ~50ms regardless of where in the item the mouse lands (top, center, bottom)
• Move mouse off the sidebar entirely — highlight returns to active route
• Fast drive-by movements across items don't trigger the highlight

---

Summary by cubic

Fixes sidebar nav hover highlight snap-back and makes hover intent more responsive. The highlight now stays on the last hovered item and only resets when the cursor leaves the sidebar; settling is faster and reliable at item edges.

• Bug Fixes
  • Moved clearing of hoveredItem to the container onMouseLeave.
  • Reduced settle interval from 100ms to 50ms for quicker hover detection.
  • Skipped edge exclusion when the mouse is stopped (dy === 0) to prevent edge deadlocks.

^{Written for commit 73745be. Summary will update on new commits.}

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🦋 Changeset detected

Latest commit: 499efec

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
dashboard	Patch

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Project	Deployment	Actions	Updated (UTC)
gram-docs-redirect	Ready	Preview, Comment	May 28, 2026 9:23pm

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