feat(sidebar): show full label in tooltip when truncated

[posthog]

Summary

When a Task name (or any other sidebar item label) is long enough to be truncated with an ellipsis in the left sidebar, hovering the label now reveals the full name in a tooltip. The tooltip only appears when the label is actually overflowing — it stays out of the way when the full name is already visible.

The implementation lives in apps/code/src/renderer/features/sidebar/components/SidebarItem.tsx and follows the existing pattern used in Combobox.tsx (compare scrollWidth vs clientWidth on mouseenter, drive a controlled Radix Tooltip).

Because all sidebar items pass through SidebarItem, this also benefits long skill names, command center entries, etc.

Test plan

• In the left sidebar, create or open a task with a very long name and confirm the full name appears in a tooltip on hover.
• Confirm that short (non-truncated) task names do not trigger a tooltip.
• Resize the sidebar narrower/wider and confirm the tooltip behavior tracks truncation state.
• Confirm clicking a task still selects it and right-click still opens the context menu.

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Created with PostHog Code

[greptile-apps]

_{Reviews (1): Last reviewed commit: "feat(sidebar): show full label in toolti..." | Re-trigger Greptile}

[greptile-apps]

Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

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### Issue 1 of 1
apps/code/src/renderer/features/sidebar/components/SidebarItem.tsx:51-53
`handleLabelMouseLeave` wraps a single, stable state-setter call in `useCallback` with no dependencies — the memoization provides no benefit since `setShowLabelTooltip` is already a stable reference. Per the project's simplicity rule ("has no superfluous parts"), it can be inlined as a plain arrow function.

```suggestion
  const handleLabelMouseLeave = () => {
    setShowLabelTooltip(false);
  };
```

_{Reviews (2): Last reviewed commit: "feat(sidebar): show full label in toolti..." | Re-trigger Greptile}