GeezerVison

The View PR link moves from the branch row of the remote diff (RemoteDiffPanel) to the git panel toolbar, between the view switcher and the diff controls, and now uses the shared Button. It still shows only when the selected ref has a PR (a pr_number, or a PR number parsed from its URL), because a branch-only ref's URL can point at its branch instead of a PR.

Before	After

At 360 px with PRs in two repos (new NarrowPanelMultipleOrigins story), the switcher label truncates before View PR does:

Pixel baselines change for the GitPanel stories that show a PR. That is expected.

Known tradeoff: View PR takes about 87 px of the toolbar row, so near the 360 px minimum panel width, or with PRs in two repos, the switcher label truncates with an ellipsis. The full label stays in the dropdown. Shortening the label is out of scope here.

Follow-up: GitPanel.tsx was over the 500-line file guideline before this PR (882 lines, now 900). Splitting it is a separate refactor.

Testing

• pnpm check, pnpm lint, the GitPanel unit tests (9), and the GitPanel story tests (19) pass.
• The per-ref test now checks that View PR links to the selected ref's PR after a ref switch. It fails when the link uses the primary ref's URL. The href is the link target, which no screenshot shows, so it stays a Vitest assertion (FE1).
• A new test covers an older ref with no pr_number and a /pull/ URL. It fails when the gate reads only pr_number.

Review record

• frontend-review (FE1 to FE10), frontend-deep-review, and coder-frontend-review ran for four rounds, until no role had an open finding.
• Fixed: the View PR markup moved into a ViewPrButton component with a named props type, and the older-ref test was added.
• Kept: the href assertions (above); the badge wrapper in RemoteDiffPanel, which right-aligns the diff stats; the existing selectedPrNumber derivation, because the shared prNumber() helper treats pr_number 0 differently; the github.example.com host in the new story, where coder-frontend-review TS3 asks for *.example.com but the file's older fixtures use github.com; and the file split (follow-up above).

Xum opened this PR on behalf of @ibetitsmike.