Replaces the local graph rendering (nodes, edges, AST transforms,
layout, tokens) with imports from the shared package. The Graph page
becomes a thin wrapper that injects host-specific concerns (router,
drawer, zustand store) via props and context.

- Graph.tsx passes topicId/theme/callbacks to <Graph> from graph-ui
- Drawer stays in apps/ui, opened from onNodeClick / onConditionalClick
- Explorer, Builder, drawer views import shared types from graph-ui
- Tailwind @source directive picks up node classes from the package

New workspace package @agentscript/vscode-webview that renders the
shared <Graph> from @agentscript/graph-ui inside a VS Code webview.
Vite + Tailwind + vite-plugin-singlefile produces a self-contained
flow.html that the extension loads.

- Parses the document source with @agentscript/agentforce on every
  update and feeds the AST into <Graph>
- Overview/detail navigation handled via local state and a floating
  back button (no router dependency)
- Detects vscode-dark / vscode-light body class for theme
- Added to pnpm-workspace.yaml via packages/vscode/webview

Adds three commands modeled after Markdown Preview:

- agentscript.flow.showPreview — open inline
- agentscript.flow.showPreviewToSide — open to side (editor-title icon)
- agentscript.flow.showSource — jump back to the .agent file

Panel opens a WebviewPanel that loads the bundled flow.html from
@agentscript/vscode-webview. Live-updates on document changes with
250ms debounce. Panels dedupe per-URI and restore across reloads via
WebviewPanelSerializer.

Build wiring:

- esbuild.mjs runs the webview vite build when dist is missing and
  copies flow.html into dist/webview/
- @agentscript/vscode-webview added as a workspace devDep so turbo
  orders it before the extension build
- .vscode/launch.json + tasks.json + scripts/build-all.mjs provide
  a single-entry F5 flow that rebuilds all workspace deps first

Attaches CST-derived source ranges to every graph node that maps to a
parsed block, then posts a goto-source message on single-click so the
VS Code webview can select the underlying range in the editor.

- Adds SourceRange type and getSourceRange helper in graph-ui
- Attaches sourceRange to topic, start_agent, topic header, phase
  containers, reasoning loop / build-instructions / LLM node, and every
  statement-backed detail node (action, run, set, template, conditional,
  transition)
- LLM action pills carry parallel actionRanges; onActionClick now
  includes the range so pill clicks jump to the reasoning action block
- previewFlow.ts handles goto-source by opening the document with the
  selected range