fix(desktop): force log refresh when reset or checkout moves HEAD

[t1gu1]

Summary

Forces git log reloading when a reset or checkout operation moves HEAD, even if the top commit of an all-refs log remains unchanged. This ensures that branch and HEAD labels are immediately updated and accurately reflected in the Git tree.

Also, the switching branch/author filter or monorepo scope now fetches only the first
page and cancels the prefetch. A view epoch drops any in-flight page that
belongs to the old view.

Changes

• Force a git log reload after reset and checkout operations in useCommitActions.
• Update App.vue to handle the forced log refresh triggers.
• Add unit tests in useCommitActions-refresh.test.ts to verify log reloading behavior when HEAD moves.

Test plan

• Checkout an earlier commit or branch and verify HEAD and branch labels update immediately in the Git tree.
• Reset HEAD to a previous commit and verify the HEAD pointer updates without manual reload.
• Run automated tests to verify useCommitActions refresh behavior passes.

[t1gu1]

Fix that issue: #213

[devlint]

Checked locally: vue-tsc clean, 1614 desktop tests pass.

The root cause of #213 holds up: after a reset/checkout the all-refs log's top commit (origin/<branch>) doesn't move, so the unforced reload kept the stale log until the next poll. Forcing it, and capping the forced depth at the viewed row + one page instead of the whole prefetched history (up to 5000 commits), addresses both the staleness and the cost.

The view epoch looks right: stale pages are dropped in both loadLog and loadMoreLog, and logLoadingMore is only cleared by the fetch that owns it.

Non-blocking:

• The epoch / forcedReloadDepth logic has no test; a small useGitRepo test for 'filter change during an in-flight page' would lock it in.
• The view anchor is only reported by CommitGraph; from the list view a forced reload falls back to one page (fine, just noting).

[devlint]

Thanks @t1gu1 — this one fixed #213 at the root: the forced reload after reset/checkout, plus capping its depth instead of refetching the whole prefetched history. The view epoch was a nice touch too. Shipped in v3.12.0, released today. 🙏