feat(ui): rework sidebar tooltip, adjust autostart pr copy

[jonathanlab]

adjusted tooltip usage in sidebar, adjusted copy for autostart PRs to be clear about billing

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Created with PostHog Code

[greptile-apps]

Prompt To Fix All With AI

Fix the following 2 code review issues. Work through them one at a time, proposing concise fixes.

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### Issue 1 of 2
apps/code/src/renderer/features/sidebar/components/SidebarItem.tsx:31-46
**Tooltip shown even for non-truncated labels**

The old implementation used `scrollWidth > clientWidth` to gate the tooltip, so it only appeared when the text was actually clipped. The new `Tooltip` wraps every string/number label unconditionally, meaning a short label like "Home" will pop up a tooltip reading "Home" after 600 ms — redundant noise on every hover. The `truncate` CSS alone doesn't signal to the tooltip whether overflow actually occurred at runtime.

### Issue 2 of 2
apps/code/src/main/services/agent/service.test.ts:465-496
**Tests not parameterised**

The four `it()` cases here share identical structure — input options and expected outcome — and would be cleaner as a single `it.each` table. The team prefers parameterised tests; this is a good candidate since each case only varies in the input array and the expected result.

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