fix: review panel labels, fetching for Rebase, Push, and Create PR after a closed PR (#575)

* fix: review panel labels, fetching for Rebase, Push, and Create PR after a closed PR

- File headers name their group when a file is listed both committed and uncommitted.
- The Diff header names the lane's base ref (origin/main), not the fork commit.
- The Diff fetches the lane's remote base on open and every minute through a new `fetch`
  channel op, so Rebase appears; `changes` itself still never fetches.
- Group totals with only binary files or summarized folders show a file count, not +0 -0.
- Additions and deletions pluralize in labels.
- The file tree and split mode stay as chosen when the file list changes.
- Push asks the agent to push a branch its remote is missing commits from, without a PR.
- Create PR returns after the branch's PR is closed, or merged with work since.

Why: packages/channel/src/changes.ts#function fetchBase | fetching stays a separate op the Diff calls once a minute; the changes read polled every 2 s must never fetch
Why: packages/ui/src/components/diff/diff-view.tsx#function DiffView | view choices (tree, mode) live outside the keyed content, which remounts whenever the file list changes

* chore: confirm lane notes the review fixes touched

* lane: sync fix-review memory

Author: iamnbutler

.lane/memory/apps/app/src/git.ts/01M53CQQMAFKZ7DCE8B12N901C-git-and-pr-actions-ask-the-c.md

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-vouched: 2026-10-16T22:49:12Z
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+vouched: 2026-10-22T14:35:52Z
 lines: 28-57
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.lane/memory/apps/app/src/git.ts/01M53DE0VH97Z9N19627SJGNMR-merge-pr-is-offered-only-whe.md

@@ -4,9 +4,9 @@ anchor: function useGit
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+vouched: 2026-10-22T14:35:52Z
 lines: 67-153
 ---
 

.lane/memory/apps/app/src/git.ts/01M53EFAEEC0X721792QGVQXJB-the-sidebar-and-diff-header.md

@@ -4,8 +4,9 @@ anchor: function useGit
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+vouched: 2026-10-22T14:35:52Z
 lines: 67-156
 ---
 

.lane/memory/packages/channel/src/changes.ts/01M53DE0T5S2AMJEWQ1V4EHA2H-behind-counts-commits-on-the.md

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+vouched: 2026-10-22T14:35:52Z
 lines: 123-161
 ---
 

.lane/memory/packages/channel/src/changes.ts/01M5J0KWKZ22SCJT7QY69G1P60-fetching-stays-a-separate-op.md

@@ -0,0 +1,12 @@
+---
+id: 01M5J0KWKZ22SCJT7QY69G1P60
+anchor: function fetchBase
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+fetching stays a separate op the Diff calls once a minute; the changes read polled every 2 s must never fetch

.lane/memory/packages/channel/src/channel.ts/01M4XQKND0900E94CG3BXBEJP7-a-run-s-end-is-read-from-the.md

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-vouched: 2026-10-20T17:05:11Z
+body_hash: e05cfd4b5bb4c4b3
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+vouched: 2026-10-22T14:35:52Z
 lines: 114-792
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.lane/memory/packages/channel/src/channel.ts/01M4YFFTK7TWGKENJAD1W10HJJ-the-desktop-default-changes.md

@@ -4,9 +4,9 @@ anchor: class Channel
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.lane/memory/packages/channel/src/channel.ts/01M4YPJQB6KKEW1YTRD08YCYJY-only-gateways-admit-clients.md

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.lane/memory/packages/channel/src/channel.ts/01M4ZH31DXZK0Y57C97DP84ZKX-handoffs-learns-queued-hando.md

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 lines: 121-817
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.lane/memory/packages/channel/src/channel.ts/01M53CAGW2RVRKCYF5BCJRTZX2-a-fork-s-starting-lane-is-re.md

@@ -4,9 +4,9 @@ anchor: class Channel
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+vouched: 2026-10-22T14:35:52Z
 lines: 127-873
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