fix(desktop): show full command in approval prompt

[annguyenNous]

Fixes #44888

Problem

The inline approval bar only showed action buttons (Run / Reject / Always allow) without showing the command being approved. The tool row header above truncated long shell commands to 120 characters via compactPreview(), leaving users unable to review what they were about to approve or reject.

Root Cause

In tool-approval.tsx, the ApprovalBar component rendered a flat <div> with buttons only. The comment at line 25-27 explicitly said "the row already shows the command, so the strip deliberately doesn't repeat it" — but the row's compactPreview(command, 120) truncates long commands with ..., making it impossible to see the full command.

Fix

Add a collapsible <pre> block in the inline approval bar that shows the full command text:

• Short commands (<=120 chars, single line): shown in full, no interaction needed
• Long commands: collapsed to ~3 lines (max-h-12) with a click-to-expand affordance
• Uses whitespace-pre-wrap and break-all so multi-line and long single-line commands wrap properly
• Styled consistently with the existing "Always allow" dialog's command <pre> block

Changes

• apps/desktop/src/components/assistant-ui/tool-approval.tsx: Added command preview <pre> block, cn import, commandExpanded state

Testing

1. Enable manual approval mode (approvals.mode: manual)
2. Ask the agent to run a long shell command (e.g., export FOO=bar && podman run --rm -v /long/path:/app -e ENV=value python:3.12 python -c 'print("hello")')
3. Verify the full command is visible in the approval prompt
4. Short commands should display without truncation
5. Click on a collapsed long command to expand it

[alt-glitch]

Duplicate of #44864 (earliest open PR for #44888). #44864, #44910, and this PR all add a full-command preview to the desktop inline approval bar in tool-approval.tsx. Marking duplicate; maintainers can pick the canonical implementation.

[cdlixuefeng-droid]

Good

[teknium1]

Thanks for the focused desktop safety improvement. This is already implemented on current main; this is an automated hermes-sweeper review.

• The duplicate comment correctly identified feat(desktop): expand the full command inline from the approval bar #44864 as the canonical implementation; it merged as 5d6c16e97237ca08778291a11695faff9b2e5963.
• Commit 266b5a19f128799d2c604a965872608902836ceb added the approval-bar Command toggle.
• apps/desktop/src/components/assistant-ui/tool/approval.tsx:231-248 renders the full pending command in a wrapped, scrollable <pre> before approval.
• apps/desktop/src/components/assistant-ui/tool/approval.test.tsx:87-98 covers revealing a 400-character command in full.
• The implementation shipped in v2026.6.19.

This PR is therefore redundant with the shipped behavior.