Add direct and AI-assisted command insertion modes

[MUFFANUJ]

closes #106

This update adds an insertion dropdown for commands so users can choose the flow they want. In Insert mode, clicking + adds the command right at the current cursor position for a fast manual action. In AI mode, it does not insert immediately; it opens the AI chat and pre-fills a prompt so the user can review or adjust before sending. This gives both a quick, direct option and a guided AI option in the same UI.

[github-actions]

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[github-actions]

Preview environments for this pull request:

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[MUFFANUJ]

The bot comments looks better now :)

[krassowski]

I think we should make the dropdown button narrower, closer to the +:

and maybe add some shared outline to both buttons on hover so that more obviously feel like a part of the same UI element?

It might be worth thinking about AI + icon that would be the same size as the one without AI. Not sure how to achieve that.

[Copilot]

Pull request overview

Adds a split “+” action for command IDs in the Plugin Playground sidebar, letting users either insert app.commands.execute('<id>'); directly at the editor cursor or open JupyterLite AI chat with a prefilled prompt to guide insertion in context.

Changes:

• Introduces a command insertion split-button UI (Insert vs AI prompt) and persists the default mode via a new setting.
• Implements direct cursor insertion plus AI chat prompt prefilling (via @jupyter/chat tracker + JupyterLite AI open-chat command).
• Expands AST-based source utilities to better detect/ensure activate(app: JupyterFrontEnd, …) context and to group imports; adds/updates UI integration tests accordingly.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/index.ts	Adds command insertion flows (direct + AI prompt), setting persistence, editor gating, and chat integration via IChatTracker.
src/token-sidebar.tsx	Adds split insert button + dropdown menu for command insertion mode selection.
src/token-insertion.ts	Enhances import insertion (group into existing imports) and adds helpers to detect/ensure activate() app parameter context.
schema/plugin.json	Adds commandInsertDefaultMode setting (insert / ai).
style/base.css	Styles the split-button and AI marker icon for command insertion.
ui-tests/tests/plugin-playground.spec.ts	Adds UI tests for command insertion at cursor and AI prompt prefilling; updates token import assertions to allow grouped imports.
package.json	Adds dependency on @jupyter/chat for IChatTracker.
yarn.lock	Lockfile updates reflecting new dependency graph.
README.md	Documents the new command insert modes and the persisted setting.

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