This PR implements automatic performance profile switching based on the active foreground window.

[TUSHAR91316]

Implementation Details

1. Process Monitoring & Event Hooks (AppProfileWatcher.cs)
   • Uses Win32 SetWinEventHook with EVENT_SYSTEM_FOREGROUND to detect active window changes. There are no continuous loops or periodic polling threads; code is triggered only when the active window changes.
   • To prevent heavy .NET allocations, process name resolution avoids Process.GetProcessById() (which does deep queries of threads/modules). Instead, it uses direct Win32 calls (OpenProcess with PROCESS_QUERY_LIMITED_INFORMATION + QueryFullProcessImageName), which run in microseconds with zero GC allocations.
   • Shell and system processes (explorer, ghelper, taskmgr, etc.) are ignored so G-Helper retains the process name of the actual user application.
2. Mappings & Config Cache
   • Mappings are loaded once on startup into a private _appProfiles dictionary cache, ensuring O(1) lookups without string parsing on window switches. Mappings are stored in G-Helper's existing config.json via the "app_profiles" key (stored as process:mode csv pairs).
3. Edge Case Safety
   • Cooldown Timer: Uses a 1000ms cooldown timer. If a user quickly switches between windows or Alt-Tabs, G-Helper waits for the focus to settle before invoking driver mode changes.
   • Manual Syncing: If a user manually changes the mode (via keyboard hotkeys or G-Helper UI) while in a mapped application, that mode is treated as the new manual default fallback, and G-Helper won't try to override it until they switch applications again.
   • Fallback: Gracefully restores the manual default profile when focusing back on any unmapped app (like web browsers or File Explorer).
4. Zero UI Footprint Context Menu (Settings.cs)
   • Adds an "Auto Profile: [AppName]" submenu right before the "Quit" item in G-Helper's tray icon context menu.
   • Rebuilds dynamically on the context menu Opening event, ensuring the detected foreground process is fresh right before display.
   • When clicked, G-Helper dynamically detects the last active user process name and populates the sub-menu with available profiles (Silent, Balanced, Turbo, and custom profiles) with a checkmark on any existing link.
   • If a link exists, a "Remove Profile Link" item is displayed to clear the mapping.

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Future Roadmap / Planned Enhancements

To make this system even more robust while preserving G-Helper's core design principles, future iterations will look into:

• G-Helper App-Wise Profile Manager: Introduce a simple, lightweight grid or list within G-Helper's settings window to view, add, or clear app profile associations manually (complementing the tray context menu).
• Armoury Crate Style Profile Tuning: Expand the watch actions to map individual custom CPU power limits, fan curves, or GPU modes (Eco, Standard, Optimized) directly to specific application focus events (scenario profile building).