Add standalone file suggestion preview and fix PreviewEnv service narrowing

[Copilot]

The file suggestion control in suggestion.tsx did not have a standalone frontend/preview entry, and its fetch path was coupled to PreviewModel for cwd resolution. The preview work also exposed a regression in the real app: PreviewEnv narrowed services with the wrong key shape (ObjectService instead of object), which broke onSelect when PreviewModel updated block metadata.

• Standalone file suggestion preview

  • Added frontend/preview/previews/suggestion.preview.tsx for the typeahead file picker.
  • Wired it to the existing preview WaveEnv/mock filesystem so it can run without the full preview model.
  • Anchors default suggestions at ~, while preserving absolute-path queries starting with /.

• Extracted reusable file suggestion fetcher

  • Added frontend/app/view/preview/previewsuggestions.ts.
  • Moved preview file-suggestion request construction out of preview.tsx and into a helper that accepts explicit cwd/connection inputs.
  • Keeps the in-app preview flow unchanged while making the standalone preview independent of PreviewModel.statFile.

• Preview mock suggestion support

  • Added preview-only mock suggestion handling backed by DefaultMockFilesystem.
  • Supports:
    • empty query from ~
    • relative queries like Documents/foo
    • absolute queries like /Users/mike/Doc
    • trailing-slash directory navigation/completion

• Fix PreviewEnv service contract

  • Corrected the preview env narrowing from:
    • services.ObjectService
  • to:
    • services.object
  • Updated PreviewModel call sites to use this.env.services.object.UpdateObjectMeta(...), which matches the actual WaveEnv service map and restores onSelect behavior in the non-mock path.

• Minor suggestion control plumbing

  • Passed placeholderText through SuggestionControl into SuggestionControlInner so the standalone preview renders the intended input placeholder.

Example of the extracted fetch path:

const fetchSuggestions = (query: string, reqContext: SuggestionRequestContext) => {
    return fetchPreviewFileSuggestions(env, query, reqContext, { cwd: "~" });
};

Corrected service usage in PreviewModel:

await this.env.services.object.UpdateObjectMeta(blockOref, updateMeta);

• Screenshot
  • https://github.com/user-attachments/assets/7763f8ff-4c89-4791-97a2-f0f9971b3979

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