feat(Chat): support whitespace queries via allowSpaces on ChatComposerTrigger

[Geervan]

Fixes #6110

Summary

Adds opt-in allowSpaces?: boolean to ChatComposerTrigger in @astryxdesign/core, enabling multi-word trigger queries (e.g. @Cindy Zhang) and trailing-space candidate browsing (@ ).

Scanner & Termination Rules

• Punctuation boundaries: ., ,, !, ?, ;, : unconditionally terminate active queries.
• Word cap: Maximum 5 words allowed in the active query (6th word closes the menu).
• Apostrophe & Hyphen: Preserved (e.g. @O'Brien, @Jean-Luc's Task).
• Cursor-relative binding: Scanning operates on textBeforeCursor up to the active selection offset.
• Zero-length query: Immediate punctuation (@,, @.) returns null immediately.
• Single-token triggers: Triggers with allowSpaces: false or unset (such as / slash commands) retain strict space-terminating single-token behavior.

New Test Suite (useTriggerMenu.test.tsx)

Added dedicated hook unit test file packages/core/src/Chat/useTriggerMenu.test.tsx covering all 12 scanner edge cases:

1. Single-token / command behavior unchanged (closes on space).
2. allowSpaces: true multi-word query matching (@Project Alpha).
3. Trailing-space browse-all query (@ ).
4. Punctuation termination, attached and spaced (., ,, !, ?, ;, :).
5. Zero-length query + immediate punctuation returns null (@,, @.).
6. Preserves apostrophes and hyphens (@O'Brien, @Jean-Luc's Task).
7. 5-word cap enforcement (5 words active, 6 words closes).
8. Double-space tolerance without closing or over-counting words.
9. Stateless reactivation on backspacing past a terminator.
10. Cursor repositioning / cursor-relative binding to earlier mentions.
11. Word-boundary gate preservation (email@domain.com, foo/bar do not activate).
12. Newline hard-termination.

Verification

• packages/core/src/Chat/useTriggerMenu.test.tsx: 12/12 passed
• packages/core/src/Chat/: 263/263 passed across 19 test files
• ESLint: 0 errors
• Changeset check: Passed

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Project	Deployment	Actions	Updated
astryx	Ready	Preview	Sep 7, 2026 5:50pm UTC

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Modified Components

Chat _{(@astryxdesign/core)} · View in Storybook

Metric	Before	After	Delta
Bundle Size (ESM)	N/A	N/A	N/A
Lines of Code	N/A	5628	-
Complexity	N/A	Very High (464)	-

Bundle Size Summary

Package	Size (ESM)	Size (CJS)	Gzipped
@astryxdesign/core	N/A	4.8KB	1.2KB

Accessibility Audit

Status: No accessibility violations detected.

Visual Regression

Status: No visual change across 2 compared shot(s).

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