fix: exec cwd, output trimming, and status line alignment

- Set cwd to config.getTargetDir() so commands like pwd/git run in the
  correct workspace directory
- Strip only trailing newline instead of trim() to preserve intentional
  leading/trailing whitespace in command output
- Match footer's marginLeft/marginRight on the status line row so it
  aligns with the rest of the footer content

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/cli/src/ui/hooks/useStatusLine.ts

@@ -166,12 +166,14 @@ export function useStatusLine(): {
 
     const child = exec(
       cmd,
-      { timeout: 5000, maxBuffer: 1024 * 10 },
+      { cwd: cfg.getTargetDir(), timeout: 5000, maxBuffer: 1024 * 10 },
       (error, stdout) => {
         if (gen !== generationRef.current) return; // stale
         activeChildRef.current = undefined;
         if (!error && stdout) {
-          setOutput(stdout.trim().split('\n')[0] || null);
+          // Strip only the trailing newline to preserve intentional whitespace.
+          const line = stdout.replace(/\r?\n$/, '').split(/\r?\n/, 1)[0];
+          setOutput(line || null);
         } else {
           setOutput(null);
         }