chore(code): add tooltip to branch selector

[VojtechBartos]

Summary

Replaces the native title attribute on the top-bar branch selector button with the styled Tooltip component already used elsewhere in the app (e.g. DiffStatsBadge, ReviewToolbar). Applies to both HeaderRow and TaskInput usages of BranchSelector.

The tooltip opens on mouse hover only — focus no longer triggers it, so it doesn't pop back up after the combobox is dismissed. It's also suppressed while the dropdown is open or while loading.

Shocase

---

Created with PostHog Code

[greptile-apps]

Prompt To Fix All With AI

This is a comment left during a code review.
Path: apps/code/src/renderer/features/git-interaction/components/BranchSelector.tsx
Line: 179-190

Comment:
**Stale `hovered` state when button becomes disabled**

When the button transitions to `disabled` while the cursor is already over it, `onMouseLeave` may not fire (disabled elements don't reliably receive pointer events in browsers), leaving `hovered` stuck as `true`. Once loading finishes — flipping `effectiveLoading` to `false` — the condition `hovered && !open && !effectiveLoading` becomes truthy even though the cursor has since moved away, causing the tooltip to appear unexpectedly.

Resetting `hovered` whenever `isDisabled` flips to `true` would guard against this:

```tsx
useEffect(() => {
    if (isDisabled) setHovered(false);
}, [isDisabled]);
```

How can I resolve this? If you propose a fix, please make it concise.

_{Reviews (1): Last reviewed commit: "chore(code): add tooltip to branch selec..." | Re-trigger Greptile}

[greptile-apps]

Stale hovered state when button becomes disabled

When the button transitions to disabled while the cursor is already over it, onMouseLeave may not fire (disabled elements don't reliably receive pointer events in browsers), leaving hovered stuck as true. Once loading finishes — flipping effectiveLoading to false — the condition hovered && !open && !effectiveLoading becomes truthy even though the cursor has since moved away, causing the tooltip to appear unexpectedly.

Resetting hovered whenever isDisabled flips to true would guard against this:

useEffect(() => {
    if (isDisabled) setHovered(false);
}, [isDisabled]);

Prompt To Fix With AI

This is a comment left during a code review.
Path: apps/code/src/renderer/features/git-interaction/components/BranchSelector.tsx
Line: 179-190

Comment:
**Stale `hovered` state when button becomes disabled**

When the button transitions to `disabled` while the cursor is already over it, `onMouseLeave` may not fire (disabled elements don't reliably receive pointer events in browsers), leaving `hovered` stuck as `true`. Once loading finishes — flipping `effectiveLoading` to `false` — the condition `hovered && !open && !effectiveLoading` becomes truthy even though the cursor has since moved away, causing the tooltip to appear unexpectedly.

Resetting `hovered` whenever `isDisabled` flips to `true` would guard against this:

```tsx
useEffect(() => {
    if (isDisabled) setHovered(false);
}, [isDisabled]);
```

How can I resolve this? If you propose a fix, please make it concise.