fix(suggestion): preserve space input in editable triggers

[lkxdsb]

🤔 This is a ...

• 🐞 Bug fix
• ✅ Test Case

🔗 Related Issues

Fixes #1873

💡 Background and Solution

When Suggestion wraps Sender, the editable control is rendered inside the Cascader trigger. Space key events can continue to the Cascader/rc-select keyboard handler, where Space is treated as a dropdown control key and its default behavior is prevented. As a result, the Sender cannot insert a space.

This PR adds a deliberately scoped compatibility fix in Suggestion:

• stop plain Space from propagating when the real event target is an editable text input, textarea, or contenteditable element;
• do not call preventDefault(), so native space insertion is preserved;
• exclude disabled/read-only controls, non-text input types, and Alt/Ctrl/Meta shortcuts;
• keep the existing arrow, Enter, and Escape navigation behavior unchanged.

This is not the root-cause fix in Cascader/rc-select. The underlying issue is that rc-select infers editability from its own mode and showSearch state instead of inspecting the actual event target inside a custom trigger. Fixing that behavior upstream requires a separate rc-select change and the subsequent Cascader/antd dependency release chain. This local guard resolves #1873 without waiting for that chain and can be reconsidered after an upstream fix is available.

Regression coverage includes the popup-open and popup-closed paths, the default Sender textarea, input slots, contenteditable slots, modifier shortcuts, and non-editable controls.

✅ Validation

• npx jest --config .jest.js components/suggestion/__tests__/useActive.test.tsx components/suggestion/__tests__/index.test.tsx --runInBand --coverage=false --no-cache
  • 2 suites passed, 45 tests passed, 1 snapshot passed.
• npx biome check packages/x/components/suggestion/useActive.ts packages/x/components/suggestion/__tests__/useActive.test.tsx packages/x/components/suggestion/__tests__/index.test.tsx
  • Passed.
• npm run lint:script --workspace packages/x
  • Checked 540 files; passed with one existing unrelated warning in sender/hooks/use-speech.ts.
• npx size-limit packages/x/dist/antdx.min.js --limit '520 KiB'
  • 523.25 kB brotlied, under the 532.48 kB limit.
• Local browser verification: with the suggestion popup open, typing / followed by Space produces "/ ".

Local full tsc and declaration generation are currently blocked by four unrelated existing errors in components/attachments/index.tsx and components/file-card/components/ImageLoading.tsx; the focused type/lint/test paths for this change pass.

📝 Change Log

Language	Changelog
🇺🇸 English	Fix Suggestion preventing spaces from being entered in an editable Sender.
🇨🇳 Chinese	修复 Suggestion 包裹可编辑 Sender 时无法输入空格的问题。

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