feat(source-control): add commit details modal and truncated-subject tooltip

[onel0p3z]

Description

Branch commit rows in the source-control panel are currently click-to-expand only, and a long
subject is silently cut off with no way to read it. This adds three things to that surface:

• Right-click context menu on a commit row: View commit details, Copy commit SHA,
  Copy commit message.
• Commit details modal: full message body, author/committer identity and dates, full SHA
  with parents and tags, pushed status, and the changed files with +/− stats. Files in the
  modal are display-only for now — wiring them to open the diff is a small follow-up
  (CommitFilesList in commits-list.tsx already has the openDiff logic).
• Truncated-subject tooltip: hovering a row shows the full subject, but only when the
  subject is actually truncated. Truncation is measured when the tooltip asks to open
  (controlled open + scrollWidth > clientWidth on the subject span), so a panel resize
  never leaves a stale answer and no useEffect is needed.

Supporting change in the git runtime: git log only captured %an/%at, so author email,
committer identity, and commit date were never available to render. LOG_FORMAT now also
captures %ae %cn %ce %ct.

High-risk callout (per AGENTS.md)

This touches the workspace-server wire contract, so flagging it explicitly:

• commitSchema is wire-visible — the git runtime mounts on workspaceWireContract and is
  served by remote workspace-server daemons. Every new field is therefore .optional(), so a
  newer desktop stays a tolerant reader of a daemon that omits them; a required field would make
  .parse() throw against any non-upgraded daemon.
• PROTOCOL_VERSION 1.0.0 → 1.1.0. Minor only, deliberately: the major keys the
  release-channel artifact paths introduced in 8950a1d, and these additions are backward
  compatible. Happy to drop the bump entirely if you would rather reserve minors for changes
  something actually negotiates on.
• LOG_FORMAT parsing is positional — parseLogRecords splits on \x1f and destructures by
  index, so the format string and the destructuring have to move together. The new
  ops/log.test.ts pins the placeholder count and the field mapping so they cannot drift apart.

Related issues

None — this came out of using the branch commits panel, not from a filed issue.

Testing

Full local gate against current main:

• pnpm run format, pnpm run lint, pnpm run typecheck — clean across all 9 projects.
• packages/core: 1414 passed / 12 skipped, including the new ops/log.test.ts and real-repo
  identity + epoch-ms assertions added to git-checkout.test.ts.
• App node project: 2820 passed / 1 skipped.
• App browser project: the two new files pass in real Chromium —
  commit-details-modal.test.tsx (context menu, modal content, display-only file list, no-body
  fallback, through the real openModal path) and commit-row-tooltip.test.tsx (real CDP hover;
  tooltip present in a 200px container, absent at 900px).

Manual verification in the running desktop app: right-click → menu → modal on a real commit;
both copy actions confirmed by pasting (SHA exact, message arrives as subject\n\nbody); tooltip
appears only when the subject is truncated, re-measures correctly after narrowing the panel, and
closes when the context menu opens; click-to-expand still works.

Screenshot/Recording (if applicable)

Screenshots of the context menu, the details modal, and the tooltip can be added on request.

Checklist

• I kept this PR small and focused
• I ran a self-review before opening this PR
• I ran the relevant local checks or explained why not
• I updated docs when behavior or setup changed
• I added or updated tests when behavior changed, or explained why not
• I only added comments where the logic is not obvious
• I used Conventional Commits for commit
  messages and, when possible, the PR title

[greptile-apps]

Greptile Summary

The PR adds commit-row context actions, a read-only commit-details modal, and truncation-aware subject tooltips. It also extends Git log records with optional author and committer metadata and increments the compatible workspace protocol minor version.

• Adds details and clipboard actions to branch commit rows.
• Displays commit metadata and changed-file statistics in a contributed modal.
• Extends positional Git-log parsing with optional identity fields and epoch-millisecond committer dates.
• Adds browser and Git-runtime coverage for the new behavior.

Confidence Score: 5/5

The PR appears safe to merge with no concrete blocking or independently actionable non-blocking issue identified.

The modal follows the existing contribution and commit-files query patterns, the tooltip remeasures truncation when opening, and the new wire fields remain optional across mixed protocol-minor versions.

Important Files Changed

Filename	Overview
apps/emdash-desktop/src/core/features/source-control/browser/diff-view/changes-panel/components/pr-entry/commit-details-modal.tsx	Adds a read-only modal that renders commit metadata and reuses the established commit-files query.
apps/emdash-desktop/src/core/features/source-control/browser/diff-view/changes-panel/components/pr-entry/commit-row-button.tsx	Extracts the commit-row button and conditionally opens a tooltip based on current text-overflow geometry.
apps/emdash-desktop/src/core/features/source-control/browser/diff-view/changes-panel/components/pr-entry/commits-list.tsx	Composes commit rows with the new context menu and opens the contributed details modal with existing workspace identifiers.
packages/core/src/runtimes/git/node/checkout/ops/log.ts	Extends positional Git-log formatting and parsing with author email and committer identity/date fields.
packages/core/src/runtimes/git/api/checkout/schemas.ts	Adds the new wire-visible commit metadata as optional fields for mixed-version compatibility.
packages/core/src/workspace-server/versions/index.ts	Applies the expected additive protocol minor-version increment.

Sequence Diagram

sequenceDiagram
  participant U as User
  participant R as Commit row
  participant M as Details modal
  participant G as Git checkout client
  participant H as Git runtime
  U->>R: Right-click commit
  R-->>U: Show context menu
  U->>R: View commit details
  R->>M: Open with commit and workspace identity
  M->>G: getCommitFiles(commit hash)
  G->>H: Wire checkout request
  H-->>G: Changed files and line statistics
  G-->>M: Query result
  M-->>U: Render message, identities, metadata, and files

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_{Reviews (1): Last reviewed commit: "test(source-control): cover the truncati..." | Re-trigger Greptile}