Match branch delete output format to project delete

Changes:
- Show count: "Branch 'X' has N child branch(es):"
- Display parent branch in tree with 2-space indent
- Use same tree rendering logic as project delete
- Use process.exit(1) for consistency (with test mode fallback)

Output now matches:
  Branch 'mala/dev2' has 1 child branch(es):
    mala/dev2
    ↳ mala/dev4

  Use --force to delete branch and all child branches

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: elitan

src/commands/branch/delete.ts

@@ -56,6 +56,8 @@ export async function branchDeleteCommand(name: string, options: { force?: boole
   // Check for child branches
   const descendants = collectDescendants(branch, project.branches);
   if (descendants.length > 0 && !options.force) {
+    console.log(`Branch '${chalk.bold(name)}' has ${descendants.length} child branch(es):`);
+
     // Build tree structure for display
     interface BranchNode {
       branch: any;
@@ -81,29 +83,27 @@ export async function branchDeleteCommand(name: string, options: { force?: boole
       }
     }
 
-    // Render tree
-    function renderBranch(node: BranchNode, depth: number = 0): string[] {
-      const lines: string[] = [];
-      if (depth > 0) {
-        const indent = '  '.repeat(depth - 1) + '↳ ';
-        lines.push(chalk.dim(`${indent}${node.branch.name}`));
-      }
+    // Render tree (same logic as project delete)
+    function renderBranch(node: BranchNode, depth: number = 0) {
+      const indent = depth > 0 ? '  '.repeat(depth) + '↳ ' : '  ';
+      console.log(chalk.dim(`${indent}${node.branch.name}`));
       for (const child of node.children) {
-        lines.push(...renderBranch(child, depth + 1));
+        renderBranch(child, depth + 1);
       }
-      return lines;
     }
 
     const rootNode = branchMap.get(branch.id)!;
-    const treeLines = renderBranch(rootNode, 0);
+    renderBranch(rootNode, 0);
+
+    console.log();
+    console.log(`Use ${chalk.bold('--force')} to delete branch and all child branches`);
 
-    let errorMessage = `Cannot delete branch '${name}' because it has child branches:\n\n`;
-    for (const line of treeLines) {
-      errorMessage += line + '\n';
+    // In test mode, throw error instead of exiting for test compatibility
+    if (process.env.NODE_ENV === 'test') {
+      throw new UserError(`Branch has ${descendants.length} child branch(es). Use --force to delete.`);
     }
-    errorMessage += `\nTo delete this branch and all its children, use:\n  ${CLI_NAME} branch delete ${name} --force`;
 
-    throw new UserError(errorMessage);
+    process.exit(1);
   }
 
   // Get ZFS config from state

tests/branch-delete-force.test.ts

@@ -22,6 +22,9 @@ describe('Branch Delete with --force', () => {
     if (setupDone) return;
     setupDone = true;
 
+    // Set test mode for proper error handling
+    process.env.NODE_ENV = 'test';
+
     silenceConsole();
     await cleanup.beforeAll();