Replace lambda closures with static lambdas and state parameters to avoid
heap allocations in RegisterCallback calls. Updated 6 component files:

- JBreadcrumb: static methods with state parameters
- JCard: instance methods
- JStack: static lambda with tuple state
- JToggle: static lambdas with state parameters
- JObjectField: instance methods + static lambdas with state
- JTextField: static lambdas with state parameters

This improves performance by eliminating 14 closure allocations across
the UI toolkit components using C#9 static lambda support.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: JasonXuDeveloper - 傑 <jason@xgamedev.net>

Replace vibrant glassmorphic design with clean monochrome palette where
dark theme is the grayscale inversion of light theme.

Changes:
- Remove all vibrant accent colors (cyan, emerald, rose, amber)
- Dark theme now uses black/white/greys inverted from light theme
- Light theme colors remain unchanged
- Remove opacity-based glass layers, use solid greys
- Update JToggle to use Primary/Secondary instead of Accent
- Simplify comments to reflect new monochrome approach

Color mapping (dark theme inverted from light):
- BgBase: #0F1419 (near-black) ← #FFFFFF (white)
- BgSurface: #374151 (gray-700) ← #E5E7EB (gray-200)
- TextPrimary: #FFFFFF (white) ← #111827 (gray-900)
- Primary: #D1D5DB (gray-300) ← #374151 (gray-700)
- Borders: #4B5563 (gray-600) ← #D1D5DB (gray-300)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: JasonXuDeveloper - 傑 <jason@xgamedev.net>

Improved dark theme to use truly neutral RGB greys (R=G=B) instead of
blue-tinted colors. Fixed three visual issues from user feedback:

1. Primary button color too dark - changed dark theme to use lighter
   #C8C8C8 grey for better contrast with white text
2. Status bar showing blue - removed colored backgrounds in dark mode,
   now uses neutral grey like light mode (monochrome design)
3. Log view too black - changed from BgBase (#0A0A0A) to BgSubtle
   (#1A1A1A) for slightly lighter background

Color changes (dark theme only, light theme unchanged):
- BgBase: #0F1419 → #0A0A0A (pure neutral black)
- BgSubtle: #1F2937 → #1A1A1A (pure neutral dark grey)
- BgSurface: #374151 → #2A2A2A (pure neutral grey)
- BgElevated: #4B5563 → #3A3A3A (pure neutral medium-dark grey)
- BgOverlay: #6B7280 → #4A4A4A (pure neutral medium grey)
- Primary: #D1D5DB → #C8C8C8 (lighter for better button contrast)
- All text/borders now use neutral greys (#FFFFFF, #D0D0D0, etc.)

JStatusBar now uses monochrome design in both themes (no colored
backgrounds in dark mode).

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: JasonXuDeveloper - 傑 <jason@xgamedev.net>

…trast

Fixed multiple visual issues in dark theme based on user feedback:

1. Button colors now properly inverted:
   - Dark Primary (#D0D0D0) = Light Secondary
   - Dark Secondary (#374151) = Light Primary
   - True grayscale inversion between themes

2. Input field backgrounds differentiated:
   - New BgInput color (#353535) lighter than BgSurface in dark mode
   - Applies to JTextField, JObjectField, and JDropdown
   - Better visual separation from surrounding surface

3. Toggle styling fixed:
   - Track colors match Primary/Secondary button colors
   - Thumb stays white in both themes (no inversion)

4. Separator/divisor visibility improved:
   - BorderSubtle lightened to #454545 in dark mode
   - Now visible against darker backgrounds

5. Button text colors use theme tokens:
   - JButton and JToggleButton use PrimaryText/SecondaryText
   - No more hardcoded Color.white
   - Dark Primary buttons now have black text (#111111)

6. Log view lightened:
   - Uses BgSubtle (#252525) instead of BgBase
   - More readable background

Color mapping (dark theme):
- Primary: #D0D0D0 (light grey, black text)
- Secondary: #374151 (dark grey, white text)
- BgInput: #353535 (for inputs)
- BgSubtle: #252525 (for log view)
- BorderSubtle: #454545 (for separators)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: JasonXuDeveloper - 傑 <jason@xgamedev.net>

Fixed Primary button hover and active states to properly invert with light
theme's Secondary colors:

Dark mode Primary (was wrong):
- Hover: #E0E0E0 → #9A9A9A (now matches light's SecondaryHover)
- Active: #C0C0C0 → #6A6A6A (now matches light's SecondaryActive)

Now the inversion is complete and consistent across all button states.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: JasonXuDeveloper - 傑 <jason@xgamedev.net>