Studio Code TUI: sort slash command autocomplete alphabetically

[youknowriad]

Related issues

How AI was used in this PR

The change and tests were written by Claude Code (Fable 5), guided and reviewed by the author. AI also traced how pi-tui's fuzzyFilter orders suggestions to confirm the scoring behavior is unaffected.

Proposed Changes

• When you type a bare / in the Studio Code TUI, the command popup previously listed commands in their source-definition order, which was almost-but-not-quite alphabetical (e.g. api-key after clear) and always showed skill commands last. It now lists them alphabetically, making commands easier to scan and predict.
• Once you start typing a query, ordering is unchanged: fuzzy-match scoring still ranks best matches first. Equal-score matches now tie-break alphabetically instead of by definition order.

Testing Instructions

• npm run cli:build && node apps/cli/dist/cli/main.mjs ai
• Type / in the composer — the command list should be alphabetical (api-key, browser, clear, …) with skill commands interleaved rather than appended at the end.
• Type /p — fuzzy ranking still applies (preview, provider, publish ranked by match quality).

Pre-merge Checklist

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

🤖 Generated with Claude Code

[wpmobilebot]

📊 Performance Test Results

Comparing f42ae74 vs trunk

app-size

Metric	trunk	f42ae74	Diff	Change
App Size (Mac)	1412.01 MB	1411.51 MB	0.50 MB	⚪ 0.0%

site-editor

Metric	trunk	f42ae74	Diff	Change
load	723 ms	756 ms	+33 ms	⚪ 0.0%

site-startup

Metric	trunk	f42ae74	Diff	Change
siteCreation	6512 ms	6499 ms	13 ms	⚪ 0.0%
siteStartup	2393 ms	2390 ms	3 ms	⚪ 0.0%

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Results are median values from multiple test runs.

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

[wojtekn]

Change looks good.