pip install of pyinstaller/pystray/pillow was a separate manual step the
README only mentioned in prose, so the script silently died on missing
packages -- especially bad on Explorer double-click, where the window
closes before any error is visible. Consolidate all dependencies into
requirements.txt (also used by README's plain "pip install -r" flow), have
the script install it itself, wrap the whole build in try/catch with
exit-code checks after every native call, and pause on both success and
failure unless -NoPause is passed.
Also move the build output from %LOCALAPPDATA% into dist/ next to the
script, so it's easy to find and matches the already-gitignored dist/ entry.
Minimizing or closing hides the window instead of leaving a taskbar
entry; only "Beenden" in the tray right-click menu really exits. Tray
callbacks route through a queue instead of touching Tk directly from
pystray's thread (same pattern as the earlier serial-thread fix).
Also fixes the build script: PyInstaller failed on the network share
while copying Tcl/Tk tzdata (path-length issue), so building now
happens in a local temp copy instead of directly on Z:.
Adds an info button that explains the MCP server's available tools.
Avoids the cmd.exe flash from double-clicking run_desktop.bat and
gives a proper double-click .exe like VersaGUI.exe. Must be deployed
locally (%LOCALAPPDATA%) -- Windows silently refuses to load the
_internal DLLs when the .exe sits on the Z: network share, no error
shown. build_and_deploy.ps1 handles build + local copy in one step.
