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/components/Footer.tsx

@@ -128,9 +128,9 @@ export const Footer: React.FC = () => {
         </Box>
       </Box>
 
-      {/* Custom status line row */}
+      {/* Custom status line row — match footer's horizontal inset */}
       {statusLineText && (
-        <Box paddingX={statusLinePadding}>
+        <Box marginLeft={2} marginRight={2} paddingX={statusLinePadding}>
           <Text dimColor wrap="truncate">
             {statusLineText}
           </Text>