fix: display correct app version as build number in status bar

- build.rs: remove unreliable git rev-list --count logic
- lib.rs: parse build number from Tauri package version at runtime
  - Release version 0.20260303.281 -> 'b281'
  - Dev version 0.1.0 -> 'dev'
- StatusBar.tsx: build number is clickable (triggers check for updates)
- App.tsx: pass handleCheckForUpdates to StatusBar
- Tests: unit tests for parse_build_label + StatusBar click behavior

src-tauri/build.rs

@@ -1,14 +1,3 @@
 fn main() {
-    let count = std::process::Command::new("git")
-        .args(["rev-list", "--count", "HEAD"])
-        .output()
-        .ok()
-        .filter(|o| o.status.success())
-        .and_then(|o| String::from_utf8(o.stdout).ok())
-        .map(|s| s.trim().to_string())
-        .unwrap_or_else(|| "DEV".to_string());
-
-    println!("cargo:rustc-env=BUILD_NUMBER={}", count);
-
     tauri_build::build()
 }

src-tauri/src/lib.rs

@@ -116,9 +116,19 @@ fn git_commit(vault_path: String, message: String) -> Result<String, String> {
     git::git_commit(&vault_path, &message)
 }
 
+fn parse_build_label(version: &str) -> String {
+    let parts: Vec<&str> = version.split('.').collect();
+    match parts.as_slice() {
+        [_, minor, patch] if minor.len() >= 6 => format!("b{}", patch),
+        [_, _, _] => "dev".to_string(),
+        _ => "b?".to_string(),
+    }
+}
+
 #[tauri::command]
-fn get_build_number() -> String {
-    format!("b{}", env!("BUILD_NUMBER"))
+fn get_build_number(app_handle: tauri::AppHandle) -> String {
+    let version = app_handle.package_info().version.to_string();
+    parse_build_label(&version)
 }
 
 #[tauri::command]
@@ -540,14 +550,21 @@ mod tests {
     }
 
     #[test]
-    fn get_build_number_returns_prefixed_value() {
-        let result = get_build_number();
-        assert!(
-            result.starts_with('b'),
-            "expected 'b' prefix, got: {}",
-            result
-        );
-        assert_ne!(result, "b0", "build number should not fall back to 0");
+    fn parse_build_label_release_version() {
+        assert_eq!(parse_build_label("0.20260303.281"), "b281");
+        assert_eq!(parse_build_label("0.20251215.42"), "b42");
+    }
+
+    #[test]
+    fn parse_build_label_dev_version() {
+        assert_eq!(parse_build_label("0.1.0"), "dev");
+        assert_eq!(parse_build_label("0.0.0"), "dev");
+    }
+
+    #[test]
+    fn parse_build_label_malformed() {
+        assert_eq!(parse_build_label("invalid"), "b?");
+        assert_eq!(parse_build_label(""), "b?");
     }
 }
 

src/App.tsx

@@ -450,7 +450,7 @@ function App() {
         </div>
       </div>
       <UpdateBanner status={updateStatus} actions={updateActions} />
-      <StatusBar noteCount={vault.entries.length} modifiedCount={vault.modifiedFiles.length} vaultPath={vaultSwitcher.vaultPath} vaults={vaultSwitcher.allVaults} onSwitchVault={vaultSwitcher.switchVault} onOpenSettings={dialogs.openSettings} onOpenLocalFolder={vaultSwitcher.handleOpenLocalFolder} onConnectGitHub={dialogs.openGitHubVault} onClickPending={() => setSelection({ kind: 'filter', filter: 'changes' })} hasGitHub={!!settings.github_token} syncStatus={autoSync.syncStatus} lastSyncTime={autoSync.lastSyncTime} conflictCount={autoSync.conflictFiles.length} lastCommitInfo={autoSync.lastCommitInfo} onTriggerSync={autoSync.triggerSync} onOpenConflictResolver={handleOpenConflictResolver} zoomLevel={zoom.zoomLevel} onZoomReset={zoom.zoomReset} buildNumber={buildNumber} indexingProgress={indexing.progress} onRemoveVault={vaultSwitcher.removeVault} />
+      <StatusBar noteCount={vault.entries.length} modifiedCount={vault.modifiedFiles.length} vaultPath={vaultSwitcher.vaultPath} vaults={vaultSwitcher.allVaults} onSwitchVault={vaultSwitcher.switchVault} onOpenSettings={dialogs.openSettings} onOpenLocalFolder={vaultSwitcher.handleOpenLocalFolder} onConnectGitHub={dialogs.openGitHubVault} onClickPending={() => setSelection({ kind: 'filter', filter: 'changes' })} hasGitHub={!!settings.github_token} syncStatus={autoSync.syncStatus} lastSyncTime={autoSync.lastSyncTime} conflictCount={autoSync.conflictFiles.length} lastCommitInfo={autoSync.lastCommitInfo} onTriggerSync={autoSync.triggerSync} onOpenConflictResolver={handleOpenConflictResolver} zoomLevel={zoom.zoomLevel} onZoomReset={zoom.zoomReset} buildNumber={buildNumber} onCheckForUpdates={handleCheckForUpdates} indexingProgress={indexing.progress} onRemoveVault={vaultSwitcher.removeVault} />
       <Toast message={toastMessage} onDismiss={() => setToastMessage(null)} />
       <QuickOpenPalette open={dialogs.showQuickOpen} entries={vault.entries} onSelect={notes.handleSelectNote} onClose={dialogs.closeQuickOpen} />
       <CommandPalette open={dialogs.showCommandPalette} commands={commands} onClose={dialogs.closeCommandPalette} />

src/components/StatusBar.test.tsx

@@ -35,6 +35,18 @@ describe('StatusBar', () => {
     expect(screen.getByText('b?')).toBeInTheDocument()
   })
 
+  it('calls onCheckForUpdates when clicking build number', () => {
+    const onCheckForUpdates = vi.fn()
+    render(<StatusBar noteCount={100} vaultPath="/Users/luca/Laputa" vaults={vaults} onSwitchVault={vi.fn()} buildNumber="b281" onCheckForUpdates={onCheckForUpdates} />)
+    fireEvent.click(screen.getByTestId('status-build-number'))
+    expect(onCheckForUpdates).toHaveBeenCalledOnce()
+  })
+
+  it('build number has "Check for updates" title', () => {
+    render(<StatusBar noteCount={100} vaultPath="/Users/luca/Laputa" vaults={vaults} onSwitchVault={vi.fn()} buildNumber="b281" onCheckForUpdates={vi.fn()} />)
+    expect(screen.getByTitle('Check for updates')).toBeInTheDocument()
+  })
+
   it('does not display branch name', () => {
     render(<StatusBar noteCount={100} vaultPath="/Users/luca/Laputa" vaults={vaults} onSwitchVault={vi.fn()} />)
     expect(screen.queryByText('main')).not.toBeInTheDocument()

src/components/StatusBar.tsx

@@ -30,6 +30,7 @@ interface StatusBarProps {
   zoomLevel?: number
   onZoomReset?: () => void
   buildNumber?: string
+  onCheckForUpdates?: () => void
   indexingProgress?: IndexingProgress
   onRemoveVault?: (path: string) => void
 }
@@ -281,7 +282,7 @@ function PendingBadge({ count, onClick }: { count: number; onClick?: () => void
   )
 }
 
-export function StatusBar({ noteCount, modifiedCount = 0, vaultPath, vaults, onSwitchVault, onOpenSettings, onOpenLocalFolder, onConnectGitHub, onClickPending, hasGitHub, syncStatus = 'idle', lastSyncTime = null, conflictCount = 0, lastCommitInfo, onTriggerSync, onOpenConflictResolver, zoomLevel = 100, onZoomReset, buildNumber, indexingProgress, onRemoveVault }: StatusBarProps) {
+export function StatusBar({ noteCount, modifiedCount = 0, vaultPath, vaults, onSwitchVault, onOpenSettings, onOpenLocalFolder, onConnectGitHub, onClickPending, hasGitHub, syncStatus = 'idle', lastSyncTime = null, conflictCount = 0, lastCommitInfo, onTriggerSync, onOpenConflictResolver, zoomLevel = 100, onZoomReset, buildNumber, onCheckForUpdates, indexingProgress, onRemoveVault }: StatusBarProps) {
   const [, setTick] = useState(0)
   useEffect(() => {
     const id = setInterval(() => setTick((t) => t + 1), 30_000)
@@ -293,7 +294,15 @@ export function StatusBar({ noteCount, modifiedCount = 0, vaultPath, vaults, onS
       <div style={{ display: 'flex', alignItems: 'center', gap: 12 }}>
         <VaultMenu vaults={vaults} vaultPath={vaultPath} onSwitchVault={onSwitchVault} onOpenLocalFolder={onOpenLocalFolder} onConnectGitHub={onConnectGitHub} hasGitHub={hasGitHub} onRemoveVault={onRemoveVault} />
         <span style={SEP_STYLE}>|</span>
-        <span style={ICON_STYLE} data-testid="status-build-number"><Package size={13} />{buildNumber ?? 'b?'}</span>
+        <span
+          role="button"
+          onClick={onCheckForUpdates}
+          style={{ ...ICON_STYLE, cursor: onCheckForUpdates ? 'pointer' : 'default', padding: '2px 4px', borderRadius: 3, background: 'transparent' }}
+          title="Check for updates"
+          data-testid="status-build-number"
+          onMouseEnter={onCheckForUpdates ? (e) => { e.currentTarget.style.background = 'var(--hover)' } : undefined}
+          onMouseLeave={onCheckForUpdates ? (e) => { e.currentTarget.style.background = 'transparent' } : undefined}
+        ><Package size={13} />{buildNumber ?? 'b?'}</span>
         <span style={SEP_STYLE}>|</span>
         <SyncBadge status={syncStatus} lastSyncTime={lastSyncTime} onTriggerSync={onTriggerSync} onOpenConflictResolver={onOpenConflictResolver} />
         {lastCommitInfo && <CommitBadge info={lastCommitInfo} />}