CLI: Truncate cwd in welcome header on narrow terminals

[youknowriad]

Related issues

• Related to: small-terminal layout glitch in the AI chat CLI welcome screen.

How AI was used in this PR

The fix was implemented with Claude Code. The diff is small and self-contained — please verify the truncation thresholds and behavior in your own narrow terminal.

Proposed Changes

• Measure the terminal width when rendering the welcome header in apps/cli/ai/ui.ts.
• If the model · provider · cwd line doesn't fit next to the WordPress logo, truncate the cwd with a leading ellipsis (e.g. …orktrees/eloquent-ride-bd2a9e) so the meaningful suffix stays visible.
• If even a short ellipsised path doesn't fit, drop the cwd entirely and show only model · provider.
• The logo's max width is now derived from the strings rather than hardcoded, so it stays correct if the logo is ever changed.

Before this change, on a narrow terminal the cwd wrapped onto subsequent lines and visually broke the logo layout (see screenshot in the issue / discussion).

Testing Instructions

1. npm run cli:build
2. Resize your terminal to ~60–70 columns wide.
3. Run node apps/cli/dist/cli/main.mjs (or whichever entrypoint launches the AI chat UI) from a directory with a long absolute path (e.g. a worktree under ~/Workspace/.../worktrees/long-name-xxxxx).
4. Confirm the WordPress logo renders cleanly on the left and the cwd is shown with a leading ellipsis on the right.
5. Resize the terminal wider — the full path should reappear once it fits.
6. Resize very narrow — the path should drop entirely, leaving only model · provider.

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[wpmobilebot]

📊 Performance Test Results

Comparing b41bded vs trunk

app-size

Metric	trunk	b41bded	Diff	Change
App Size (Mac)	1439.57 MB	1439.57 MB	+0.00 MB	⚪ 0.0%

site-editor

Metric	trunk	b41bded	Diff	Change
load	1883 ms	1829 ms	54 ms	🟢 -2.9%

site-startup

Metric	trunk	b41bded	Diff	Change
siteCreation	8138 ms	9126 ms	+988 ms	🔴 12.1%
siteStartup	4952 ms	4948 ms	4 ms	⚪ 0.0%

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Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff)