fix(web): the base branch stays readable in the pull request header

[yordis]

• The header's job in one line is to say what is being merged into what. The base branch was collapsing to a letter and an ellipsis while the head kept a wide box, so the header dropped the branch a reader opened the review to check and kept the one they were already on.
• It only showed at narrower widths, which is where most reviews are read in this app: the panel docked beside a thread.
• Ledger entry: 0014.

[cursor]

PR Summary

Low Risk
CSS-only flex/truncation tweaks in the PR header; no auth, data, or API behavior changes.

Overview
Fixes narrow pull request headers so the base branch stays legible when space is tight (e.g. panel docked beside a thread), instead of truncating to a single character while the head branch kept a wide box.

In PullRequestDetailPanel, the base branch labels use shrink-0 and a max-w-32 cap in condensed chrome; the head copy button drops max-w-64 shrink so head truncates first—matching “merge into what” as the primary read.

Adds fork ledger 0014 and indexes it in docs/fork/README.md.

^{Reviewed by Cursor Bugbot for commit ec5a3dc. Bugbot is set up for automated code reviews on this repo. Configure here.}

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: ba3367f9-4408-409f-a7eb-8e14399919af

📥 Commits

Reviewing files that changed from the base of the PR and between c05617d and ec5a3dc.

📒 Files selected for processing (3)

• apps/web/src/components/pullRequest/PullRequestDetailPanel.tsx
• docs/fork/0014-base-branch-stays-readable.md
• docs/fork/README.md

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