Add Figma Desktop Bridge plugin

[daltoniam]

Summary

• Adds figma_bridge WASM plugin (15 tools) that connects to a companion Figma Desktop plugin via HTTP bridge
• Provides write access to the Figma Plugin API: create frames, text, rectangles, components, instances, auto layout, fills/strokes, and arbitrary plugin code execution
• Complements the core Switchboard Figma REST API integration (read-only) with canvas write capabilities

Architecture

The plugin sends JSON commands to a local HTTP server (http://127.0.0.1:9223/api/command) that a companion Figma Desktop Bridge plugin exposes. The bridge plugin runs inside Figma Desktop and forwards commands to the Plugin API sandbox.

Tools

Tool	Description
figma_bridge_status	Check bridge connection
figma_bridge_get_selection	Get currently selected nodes
figma_bridge_get_page_nodes	Get top-level page nodes
figma_bridge_create_frame	Create a frame
figma_bridge_create_text	Create text node
figma_bridge_create_rectangle	Create rectangle
figma_bridge_set_node_property	Set any node property
figma_bridge_delete_node	Delete a node
figma_bridge_clone_node	Clone/duplicate a node
figma_bridge_create_component	Create or convert to component
figma_bridge_create_instance	Instantiate a component
figma_bridge_set_auto_layout	Apply auto layout
figma_bridge_set_fills	Set fill colors
figma_bridge_set_strokes	Set strokes
figma_bridge_execute	Run arbitrary Plugin API code

Test plan

• cargo clippy --target wasm32-wasip1 -- -D warnings passes
• cargo fmt clean
• Binary builds and is 172KB optimized
• Manual test with Figma Desktop bridge plugin (requires companion plugin setup)