feat: MCP Bridge Workbench, just command cleanup, testing, etc. (#24)

* fix: lots of fixes and name refactoring

* feat: Add workbench preferences

* fix: MCP bridge status widget and just command fixes

* fix(tests): Use the correct mesa-glx package

* fix(ci): Add fontconfig to GUI test dependencies

FreeCAD GUI was failing to start with:
"Fontconfig error: Cannot load default config file: No such file"

Added fontconfig and fonts-dejavu-core packages to the GUI test job
dependencies to resolve the font configuration issue.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* refactor(addon): Extract path utilities into shared module

Create path_utils.py module that consolidates duplicated path-finding
logic from commands.py and InitGui.py:
- get_addon_path(): Find addon directory with caching and fallbacks
- get_icon_path(): Get full path to an icon file
- get_icons_dir(): Get path to icons directory
- get_workbench_icon(): Get path to workbench main icon

This removes ~100 lines of duplicated code while preserving the same
behavior including _addon_path_cache and all fallback methods.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix(addon): Prevent stale plugin state on startup failure

The StartMCPBridgeCommand.Activated method could leave _mcp_plugin in
a partially initialized state if FreecadMCPPlugin.start() failed after
the plugin was instantiated.

Changes:
- Create plugin in a local variable first
- Only assign to _mcp_plugin after start() succeeds
- Explicitly clear _mcp_plugin and _running_config in exception
  handlers to ensure clean state for subsequent retry attempts

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix: Lot of broad improvements

* fix(ci): Use blocking headless_server.py for GUI tests

The GUI test was using startup_bridge.py which is non-blocking
(designed for interactive use). For CI, even in GUI mode, we need
the blocking headless_server.py that calls run_forever() to keep
FreeCAD running. GUI features are still available since we use
the 'freecad' executable instead of 'freecadcmd'.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* refactor(addon): Rename headless_server.py to blocking_bridge.py

The old name was misleading because:
- It works with both GUI (freecad) and headless (freecadcmd) modes
- The key characteristic is that it BLOCKS with run_forever()

New naming convention clarifies the difference:
- blocking_bridge.py: Starts bridge and blocks (for CI, servers)
- startup_bridge.py: Starts bridge and returns (for interactive GUI)

Updated all references across:
- GitHub workflow (macro-test.yaml)
- Just commands (freecad.just)
- Unit tests (test_addon_structure.py)
- Documentation (5 files)
- CLAUDE.md

Also improved the script to detect GUI mode dynamically using
FreeCAD.GuiUp and display the appropriate status message.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix(just): Remove erroneous rm of startup_bridge.py on error

The startup script is now a permanent source file in the repository,
not a generated temporary file. The rm -f would have deleted source
code if FreeCAD wasn't found.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix: General improvements

* fix: Lots of general fixes and only stable to PyPi

* fix: small cleanup

* fix: Small fixes and hopefully fixes the GUI tests

* fix: Add proper library paths for FreeCAD GUI in CI

- Create wrapper scripts instead of symlinks for AppImage binaries
- Set LD_LIBRARY_PATH, QT_PLUGIN_PATH for GUI mode
- Add diagnostic output to identify startup failures

* fix: Use apprun for GUI tests in CI

* fix: Improving Xvfb tests

* fix: GUI tests worlk

* chore: remove invalid --no-splash comments

* fix: ARM64 architecture support and other fixes

* fix: cleanup

* test: just commands test suite

* test: improve just command tests

* fix: more general improvements

* fix: more cleanup

* fix: more updates

* fix: small tweaks

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

package.xml

@@ -36,10 +36,10 @@
     <content>
 
         <workbench>
-            <name>MCP Bridge</name>
+            <name>Robust MCP Bridge</name>
             <version>0.5.0-beta</version>
             <date>2026-01-07</date>
-            <description>MCP (Model Context Protocol) bridge workbench for AI assistant integration with FreeCAD. Works in both GUI mode (with full visual features including screenshots, colors, and camera control) and headless mode (for automation and CI/CD). Provides toolbar commands to start, stop, and monitor the MCP bridge server. Supports XML-RPC and JSON-RPC protocols. Connect Claude Code, Cursor, or other MCP-compatible AI assistants to control FreeCAD programmatically with 82+ CAD tools.</description>
+            <description>Robust MCP Bridge workbench for AI assistant integration with FreeCAD. Uses the Model Context Protocol (MCP) to connect AI assistants like Claude Code and Cursor to FreeCAD. Works in both GUI mode (with full visual features including screenshots, colors, and camera control) and headless mode (for automation and CI/CD). Provides toolbar commands to start, stop, and monitor the MCP bridge server. Supports XML-RPC and JSON-RPC protocols with 82+ CAD tools.</description>
             <classname>FreecadRobustMCPWorkbench</classname>
             <subdirectory>./addon/FreecadRobustMCP/</subdirectory>
             <icon>FreecadRobustMCP.svg</icon>