fix: augment PATH for git subprocesses and improve explorer panel

- Fix git-lfs 'command not found' by passing an enhanced PATH to all
  run_git() calls, ensuring subprocesses like git-lfs filter-process
  can be found in /opt/homebrew/bin and other common locations
- Default explorer panel to Changes tab instead of Files
- Persist per-lane tab selection so switching lanes restores each
  lane's last chosen tab (Changes or Files)
- Sort staged, unstaged, and untracked file lists alphabetically for
  consistent ordering across git status refreshes

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: faiyaz26

Cargo.lock

@@ -77,9 +77,15 @@ export function ChangesView(props: ChangesViewProps) {
     return files;
   });
 
-  const stagedFiles = createMemo(() => allFiles().filter((f) => f.category === 'staged'));
-  const unstagedFiles = createMemo(() => allFiles().filter((f) => f.category === 'unstaged'));
-  const untrackedFiles = createMemo(() => allFiles().filter((f) => f.category === 'untracked'));
+  const stagedFiles = createMemo(() =>
+    allFiles().filter((f) => f.category === 'staged').sort((a, b) => a.path.localeCompare(b.path))
+  );
+  const unstagedFiles = createMemo(() =>
+    allFiles().filter((f) => f.category === 'unstaged').sort((a, b) => a.path.localeCompare(b.path))
+  );
+  const untrackedFiles = createMemo(() =>
+    allFiles().filter((f) => f.category === 'untracked').sort((a, b) => a.path.localeCompare(b.path))
+  );
 
   const totalChanges = createMemo(() => allFiles().length);
 

frontend/src/components/explorer/ChangesView.tsx

@@ -1,6 +1,10 @@
 // File Explorer - Main component for browsing project files
 
 import { createSignal, createEffect, Show } from 'solid-js';
+
+// Per-lane tab selection — persists across lane switches within the session.
+// Defaults to 'changes' for any lane that hasn't been visited yet.
+const laneTabCache = new Map<string, 'files' | 'changes'>();
 import { useFileTree, useFileWatcher } from './hooks';
 import { FileTree } from './FileTree';
 import { ChangesView } from './ChangesView';
@@ -14,9 +18,21 @@ interface FileExplorerProps {
 }
 
 export function FileExplorer(props: FileExplorerProps) {
-  const [activeTab, setActiveTab] = createSignal<'files' | 'changes'>('files');
+  const [activeTab, setActiveTab] = createSignal<'files' | 'changes'>(
+    laneTabCache.get(props.laneId) ?? 'changes'
+  );
   const [openFileDialogOpen, setOpenFileDialogOpen] = createSignal(false);
 
+  // Restore the correct tab whenever the active lane changes
+  createEffect(() => {
+    setActiveTab(laneTabCache.get(props.laneId) ?? 'changes');
+  });
+
+  const handleTabChange = (tab: 'files' | 'changes') => {
+    laneTabCache.set(props.laneId, tab);
+    setActiveTab(tab);
+  };
+
   const tree = useFileTree();
 
   // Reload file tree when lane or workingDir changes
@@ -47,7 +63,7 @@ export function FileExplorer(props: FileExplorerProps) {
   return (
     <div class="h-full flex flex-col bg-zed-bg-panel">
       {/* Tabs */}
-      <Tabs activeTab={activeTab()} onTabChange={setActiveTab} />
+      <Tabs activeTab={activeTab()} onTabChange={handleTabChange} />
 
       {/* Content */}
       <div class="flex-1 overflow-auto">

frontend/src/components/explorer/FileExplorer.tsx

@@ -118,11 +118,55 @@ fn find_repo_root(path: &str) -> Result<String, String> {
     }
 }
 
+/// Build an enhanced PATH that includes common binary locations.
+///
+/// In macOS app bundles and some Linux environments, the process PATH is minimal.
+/// Git subprocesses like `git-lfs filter-process` inherit this limited PATH,
+/// causing "command not found" errors even when the tool is installed.
+fn enhanced_path() -> String {
+    let current_path = std::env::var("PATH").unwrap_or_default();
+
+    #[cfg(unix)]
+    {
+        let home = dirs::home_dir().unwrap_or_default();
+        let home_str = home.to_string_lossy();
+        let extra = [
+            "/usr/local/bin",
+            "/opt/homebrew/bin", // Homebrew on Apple Silicon
+            "/opt/homebrew/sbin",
+            "/usr/bin",
+            "/bin",
+            "/usr/sbin",
+            "/sbin",
+        ]
+        .iter()
+        .map(|s| s.to_string())
+        .chain([
+            format!("{}/.cargo/bin", home_str),
+            format!("{}/.local/bin", home_str),
+            format!("{}/bin", home_str),
+        ])
+        .collect::<Vec<_>>()
+        .join(":");
+
+        if current_path.is_empty() {
+            extra
+        } else {
+            format!("{}:{}", current_path, extra)
+        }
+    }
+
+    #[cfg(not(unix))]
+    current_path
+}
+
 /// Run a git command and return the output
 fn run_git(work_dir: &Path, args: &[&str]) -> Result<String, String> {
     let mut command = Command::new("git");
     command.args(args);
     command.current_dir(work_dir);
+    // Augment PATH so git subprocesses (e.g. git-lfs filter-process) can be found
+    command.env("PATH", enhanced_path());
 
     let output = command
         .output()