fix(web): make PR badge hover lists easy to click

[Bil0000]

Moving the mouse from a PR badge into its list crossed a 4px gap. In the sidebar, the thread tooltip could take over there and close the list before a PR could be clicked.

Remove the gap in the shared sidebar/composer PR control. Use the same clickable list row and glass popup for a single PR, including branch PRs with no saved links. Keep the existing badge actions and modified-click behavior.

Verification

• Reproduced the mouse failure in the real app before the change; the same automated Chromium path passes after it.
• Checked all five linked PRs and a single branch PR at 1280px and 900px widths, plus the composer footer, keyboard focus/Escape, and Ctrl-click.
• All 53 focused ThreadStatusIndicators tests pass; targeted lint, format check, and web typecheck pass.

Scope: one shared web component, used by web and desktop. No server, contract, or mobile changes.

Single PR

Before	After

Multiple PRs

Before	After

Mouse path before and after

t3-pr-hover-before-after.mp4

Model: GPT-6. Harness: Codex.

[macroscopeapp]

Approvability

Verdict: Approved at b745c15

Macroscope's review found this PR approvable — This is a contained one-file web UI fix that removes the hover gap and makes existing single- and multi-PR tooltip rows clickable while preserving current navigation behavior. It introduces no schema, infrastructure, security-sensitive, product-default, or static-analysis changes.

No code changes detected at 196cbdd. Prior analysis still applies.

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[Bil0000]

Rebased onto the current t3code/codex-turn-mapping tip (f180e95).

The base branch was force-pushed, which stranded this PR: GitHub compared it against a rewritten base, so it reported CONFLICTING with ~1400 changed files that were never part of this change. This PR's own commits were replanted onto the new base tip; every commit applied with no conflicts, and the diff against the new base is identical to the diff before the rebase. No behavior was changed as part of the rebase.