fix: correct CSS module import paths after file renames (Task 4.4)

- Fix incorrect relative paths in feature components after directory restructure
- Components in features/{domain}/ were importing ./features/{domain}/X.module.css
  instead of ./X.module.css
- Affected: AppShell, GitToolbar, FileEditor, CommitDialog, CommitPanel,
  MergeDialog, SettingsTabLayout, InstanceList, TerminalComponent

Quality gates: tsc (pass), eslint (pass), build (pass)
Refs: repo-restructure Task 4.4

apps/web/scripts/check-structure.js

@@ -41,14 +41,10 @@ function checkFileSize(filePath, maxLines = 300) {
 	const relative = path.relative(SRC_DIR, filePath);
 	if (lines > maxLines) {
 		if (OVERSIZE_ALLOWLIST.includes(relative)) {
-			console.warn(
-				`⚠️  OVERSIZED (${lines} lines, allowlisted): ${relative}`,
-			);
+			console.warn(`⚠️  OVERSIZED (${lines} lines, allowlisted): ${relative}`);
 			warnings++;
 		} else {
-			console.error(
-				`❌ OVERSIZED (${lines} lines): ${relative}`,
-			);
+			console.error(`❌ OVERSIZED (${lines} lines): ${relative}`);
 			errors++;
 		}
 	}