feat(wiki): add MobX-Lark document debugger

[malb200710-dev]

Summary

• Adds /wiki/[node_token]/debugger for MobX-Lark document inspection.
• Fetches the current wiki node, creates a DocumentBlockModel, and shows getAll() raw blocks plus getRenderableAll() blocks in JSON viewers.
• Shows the renderBlocks() component tree in an idea-react CodeBlock, then renders the same blocks as a full-width read-only document preview.

Validation

• Confirmed mobx-lark@2.8.1 exports DocumentBlockModel#getAll(), DocumentBlockModel#getRenderableAll(), and renderBlocks() from the published type declarations.
• Static route checks passed for the required debugger route, raw block view, renderable block view, component tree view, and read-only rendered view.
• Full tsc --noEmit was not run in this workspace because node, npm, and pnpm are not installed here.

Closes #14

[malb200710-dev]

Validation update: I installed dependencies locally with the bundled Node runtime using:

pnpm install --no-frozen-lockfile --ignore-scripts

The frozen install is blocked by an existing pnpm lockfile/config mismatch, but with dependencies installed I fixed the React type narrowing issue in the debugger route and ran:

tsc --noEmit

TypeScript now completes successfully.