release: v0.8.9 — fix tool detection on Bazzite and immutable distros

[I4cTime]

Summary

• Fix tool detection on Bazzite, SteamOS, Fedora Atomic, and NixOS — adds fallback path probing when shutil.which() fails because binaries live outside the app's PATH (Gamescope and MangoHud not detected on Bazzite / immutable Fedora Atomic distros #10)
• New tool_check.py module — centralizes all tool detection with a three-tier strategy: normal PATH → extra immutable-distro bin dirs → tool-specific known paths
• Electron PATH augmentation — appends common non-standard bin paths before spawning the Python backend
• UI hints — adds Bazzite/SteamOS entries to the Gamescope and MangoHud "Not Installed" screens

Changed Files

File	Change
src/game_setup_hub/tool_check.py	New — shared find_tool() / is_tool_available() with fallback paths
src/game_setup_hub/gamescope.py	Use is_tool_available("gamescope")
src/game_setup_hub/mangohud.py	Use is_tool_available("mangohud")
src/game_setup_hub/presets.py	Use is_tool_available() for mangohud + gamemoderun
src/game_setup_hub/protontricks.py	Use find_tool("protontricks") for binary path
src/game_setup_hub/display.py	Use find_tool() for xrandr / wlr-randr
electron/main.ts	Append extra PATH dirs before spawning Python
gamescope-builder.tsx	Add Bazzite/SteamOS install hint
mangohud/page.tsx	Add Bazzite/SteamOS install hint
pyproject.toml	Bump to 0.8.9
electron/package.json	Bump to 0.8.9

Closes #10

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