Persist font settings via Windows Registry

[Copilot]

Font preferences (name and size) were not persisted across application restarts. Users had to reconfigure from Consolas 16pt every time.

Changes

New module: src/modules/settings.cpp

• LoadFontSettings() - reads from HKCU\Software\LegacyNotepad on startup
• SaveFontSettings() - writes when user changes font via Format menu
• Font size validated to 8-72pt range

Integration points:

• main.cpp - loads settings before window creation
• dialog.cpp - saves settings after FormatFont() completes
• CMakeLists.txt - added to build

Implementation

Registry values:

• FontName (REG_SZ) - font face name
• FontSize (REG_DWORD) - point size

Gracefully falls back to hardcoded defaults if registry key doesn't exist. Uses same registry pattern as existing theme.cpp.

void LoadFontSettings()
{
    HKEY hKey;
    if (RegOpenKeyExW(HKEY_CURRENT_USER, SETTINGS_KEY, 0, KEY_READ, &hKey) == ERROR_SUCCESS)
    {
        // Read FontName and FontSize, validate, close key
        // Falls back to g_state defaults if values invalid
    }
}

Original prompt

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This section details on the original issue you should resolve

<issue_title>Not possible to change default font, font size etc</issue_title>
<issue_description>Hi and thanks for this app!

Legacy Notepad always reverts to Consolas, Regular, 16.

16 is way too big.

Not sure what the best approach is, either put a .ini or .cfg file in the same folder as the .exe, or maybe just store it in the registry.

Or maybe I'm missing something.

Have a nice day/evening</issue_description>

Comments on the Issue (you are @copilot in this section)

@forloopcodes on it

• Fixes Not possible to change default font, font size etc #13

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