feat: chat editor integration.

[knightedcodemonkey]

• completes chat features for Feature: Add an AI Agent Side Panel using GitHub Models for @knighted/develop #18

[Copilot]

Pull request overview

This PR expands the AI chat drawer into a mode-aware assistant that can propose structured edits to the Component/Styles editors and lets users apply (and undo) those proposals, while also updating the GitHub Models chat API wrapper to support tool calls.

Changes:

• Adds editor-proposal tooling + apply/undo workflow to the AI chat drawer, including mode-aware system prompting and conversation compaction.
• Extends github-api chat completion helpers to send/receive tools + tool_choice (including streaming tool-call deltas).
• Updates render-runtime auto-render behavior for export default cases and adds Playwright coverage for the new behaviors.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/styles/ai-controls.css	Adds styles for new chat title/icon, message label icons, proposal action buttons, and undo actions UI.
src/modules/render-runtime.js	Skips implicit App wrapping when export default is present (supports default-export entry patterns).
src/modules/github-pr-drawer.js	Dedupes/serializes PR context verification requests to avoid repeated network work.
src/modules/github-chat-drawer/chat-utils.js	Extracts shared chat-related normalization/utilities into a dedicated module.
src/modules/github-chat-drawer/payload.js	Builds outbound chat payload with mode-aware policy prompt + conversation summarization/byte-budget trimming.
src/modules/github-chat-drawer/proposals.js	Adds tool schema + extraction of editor proposals from tool calls or markdown code fences.
src/modules/github-chat-drawer/drawer.js	Rebuilds chat drawer controller with tool-call proposals, apply-to-editor + undo, and improved message rendering.
src/modules/github-chat-drawer.js	Removes the previous monolithic chat drawer implementation.
src/modules/github-api.js	Adds tool definitions/tool_choice support and tool-call extraction for both streaming and non-stream responses.
src/index.html	Updates AI chat header markup (title + icon) and removes rate-limit display node.
src/app.js	Rewires chat drawer import and passes editor setters + render scheduling hook for apply/undo integration.
playwright/rendering-modes.spec.ts	Adds E2E coverage for auto-render handling of default-exported named components.
playwright/helpers/app-test-helpers.ts	Extends chat request body typing and adds editor-source helper setters used by new E2E tests.
playwright/github-byot-ai.spec.ts	Updates AI chat tests for tools/tool_choice and adds E2E coverage for apply/undo proposal flow.
docs/next-steps.md	Removes completed roadmap section for prior AI assistant phases.
AGENTS.md	Adds guidance to avoid index/barrel files and prefer explicit import paths.

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