Fix font style selection ignoring user-selected weight/italic/underline

[Copilot]

Font dialog selections were ignored during font creation. Selecting "TECHNICAL Regular" rendered as Bold because CreateFontW always used hardcoded FW_NORMAL instead of the user's chosen style.

Changes

• AppState: Added fontWeight, fontItalic, fontUnderline fields to persist font attributes
• FormatFont(): Extract and store lfWeight, lfItalic, lfUnderline from ChooseFontW result
• ApplyFont(): Use stored attributes instead of hardcoded defaults when calling CreateFontW

Before/After

// Before: Ignored user selection
g_state.hFont = CreateFontW(height, 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE, ...);

// After: Uses selected attributes
g_state.hFont = CreateFontW(height, 0, 0, 0, g_state.fontWeight, g_state.fontItalic, g_state.fontUnderline, FALSE, ...);

Affects all fonts with multiple weight/style variants, not just TECHNICAL.

Original prompt

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This section details on the original issue you should resolve

<issue_title>legacy-notepad-x64 will not load up regular TECHNICAL font</issue_title>
<issue_description>

• setting to regular TECHNICAL font sets BOLD instead
• would like regular TECHNICAL font to display REGULAR
  </issue_description>

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

@forloopcodes lemme see

• Fixes legacy-notepad-x64 will not load up regular TECHNICAL font #10

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