[fluent] feat: Implement system colors

This commit introduces system colors for Fluent UI components. These colors are used for attention, success, caution, critical, and neutral states.

The colors are generated based on the dark mode setting and provide both solid and background variants.

Author: Sanlorng

fluent/src/commonMain/kotlin/com/konyaco/fluent/Colors.kt

@@ -39,6 +39,8 @@ class Colors(
         internal set
     var borders by mutableStateOf(generateBorders(fillAccent, stroke, darkMode))
         internal set
+    var system by mutableStateOf(generateSystemColors(darkMode))
+        internal set
 }
 
 data class Borders(
@@ -372,6 +374,22 @@ data class Background(
     )
 }
 
+data class SystemColors(
+    val attention: Color,
+    val attentionBackground: Color,
+    val solidAttentionBackground: Color,
+    val success: Color,
+    val successBackground: Color,
+    val caution: Color,
+    val cautionBackground: Color,
+    val critical: Color,
+    val criticalBackground: Color,
+    val neutral: Color,
+    val neutralBackground: Color,
+    val solidNeutral: Color,
+    val solidNeutralBackground: Color,
+)
+
 fun generateShades(accent: Color): Shades {
     return getAccentShades()[accent] ?: getDefaultShades()
 }
@@ -720,3 +738,39 @@ private fun generateBorders(fillAccent: FillAccentColors, stroke: Stroke, darkMo
             0.9414f to fillAccent.default
         )
     )
+
+private fun generateSystemColors(darkMode: Boolean): SystemColors {
+    return if (darkMode) {
+        SystemColors(
+            attention = Color(0xFF60CDFF),
+            attentionBackground = Color(0x08FFFFFF),
+            solidAttentionBackground = Color(0xFF2E2E2E),
+            success = Color(0xFF6CCB5F),
+            successBackground = Color(0xFF393D1B),
+            caution = Color(0xFFFCE100),
+            cautionBackground = Color(0xFF433519),
+            critical = Color(0xFFFF99A4),
+            criticalBackground = Color(0xFF442726),
+            neutral = Color(0x8BFFFFFF),
+            neutralBackground = Color(0x08FFFFFF),
+            solidNeutral = Color(0xFF9D9D9D),
+            solidNeutralBackground = Color(0xFF2E2E2E),
+        )
+    } else {
+        SystemColors(
+            attention = Color(0xFF0070CB),
+            attentionBackground = Color(0x80F6F6F6),
+            solidAttentionBackground = Color(0xFFF7F7F7),
+            success = Color(0xFF0F7B0F),
+            successBackground = Color(0xFFDFF6DD),
+            caution = Color(0xFF9D5D00),
+            cautionBackground = Color(0xFFFFF4CE),
+            critical = Color(0xFFC42B1C),
+            criticalBackground = Color(0xFFFDE7E9),
+            neutral = Color(0xFF72000000),
+            neutralBackground = Color(0x06000000),
+            solidNeutral = Color(0xFF8A8A8A),
+            solidNeutralBackground = Color(0xFFF3F3F3),
+        )
+    }
+}