feat: show full thread title in a tooltip when hovering sidebar thread names

[UtkarshUsername]

Closes #1993

What Changed

Shows the full thread title in a styled tooltip when hovering a sidebar thread name.

This keeps truncated thread labels readable without changing sidebar layout. The PR also adds browser test coverage for the hover tooltip.

Why

Thread titles in the sidebar are visually truncated to fit the available width. When a title is longer than the sidebar row, there is no hover affordance to reveal the full name, which makes it harder to see full thread names, and to distinguish similarly named threads without opening them.

UI Changes

Before:

After:
(When hovering over the thread in the sidebar. Cursor is not visible in the screenshot.)

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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Note

Low Risk
Low risk UI-only change that wraps sidebar thread titles in an existing tooltip component and adds a browser test; no data, auth, or backend logic is affected.

Overview
Sidebar thread rows now show the full thread title in a tooltip on hover, keeping the row label truncated while improving readability.

Adds a browser regression test in ChatView.browser.tsx that hovers the sidebar title (via new data-testid="thread-title-<id>") and asserts the tooltip popup renders the complete title.

^{Reviewed by Cursor Bugbot for commit cfe3e03. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Show full thread title in a tooltip when hovering sidebar thread names

Wraps the thread title span in Sidebar.tsx with a Tooltip component that displays the full title on hover, using side="top" with wrapping styles. A data-testid="thread-title-<id>" attribute is added to the trigger element. A browser test in ChatView.browser.tsx verifies the tooltip appears on hover.

^{Macroscope summarized cfe3e03.}

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[macroscopeapp]

Approvability

Verdict: Approved

This PR adds a tooltip to show the full thread title when hovering over truncated sidebar thread names. The changes are minimal UI enhancements (wrapping an existing span with tooltip components) plus a corresponding test. No business logic, security, or runtime behavior is affected.

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