Show workspace commits clearly in Changes (#2350)

* feat(commits): distinguish workspace history from base commits

Keep every workspace commit visible while bounding base history to ten
context commits, and make push and base state readable in the commit rail.

* fix(commits): preserve history when base refs disappear

Fall back to recent HEAD history for stale saved bases, and reject truncated
git output instead of presenting an incomplete commit list.

* fix(commits): classify history against the current base

Use the furthest-ahead local or remote base for classification, and re-infer
base history when saved worktree metadata points to a deleted branch.

packages/app/src/git/commits-section/commits-section.tsx

@@ -67,8 +67,15 @@ function CommitsSectionContent({
   }
   return (
     <View style={styles.list}>
-      {query.data.commits.map((commit) => (
-        <CommitRow key={commit.sha} commit={commit} now={now} onCommitPress={onCommitPress} />
+      {query.data.commits.map((commit, index) => (
+        <CommitRow
+          key={commit.sha}
+          commit={commit}
+          isFirst={index === 0}
+          isLast={index === query.data.commits.length - 1}
+          now={now}
+          onCommitPress={onCommitPress}
+        />
       ))}
     </View>
   );
@@ -110,7 +117,10 @@ export function CommitsSection({ serverId, cwd, onCommitPress }: CommitsSectionP
   if (query.status === "unsupported") {
     return null;
   }
-  const commitCount = query.status === "loaded" ? query.data.commits.length : null;
+  const commitCount =
+    query.status === "loaded"
+      ? query.data.commits.filter((commit) => !commit.isOnBase).length
+      : null;
 
   return (
     <View style={styles.container}>