UI: Refactor Text component and typography handling (#585)

### TL;DR
Improved text style handling and simplified Text component parameters.

### What changed?
- Removed redundant `fontFamily` parameter from Text component overload
- Added explicit handling of `LocalTextColor` with fallback to theme's `onSurface` color
- Introduced separate `textStyle` and `textColor` variables for clearer style composition
- Modified style merging to use `copy()` for more explicit property updates

### Why make this change?

When the Text API is used inside a Button, it will provide a composition local style for text and color, which should be respected by the Text component. However, Text can also be used independently, requiring a style parameter. If we provide a style parameter, users might misuse it within a Button. To address this, we are merging and giving higher priority to the composition local text and color styles, then falling back to the provided parameters. This ensures consistency and prevents misuse.

taj/src/commonMain/kotlin/xyz/ksharma/krail/taj/components/Text.kt

@@ -26,7 +26,6 @@ fun Text(
     textAlign: TextAlign = TextAlign.Start,
     maxLines: Int = Int.MAX_VALUE,
     overflow: TextOverflow = if (maxLines == Int.MAX_VALUE) TextOverflow.Clip else TextOverflow.Ellipsis,
-    fontFamily: FontFamily? = null,
     onTextLayout: ((TextLayoutResult) -> Unit)? = null,
 ) {
     Text(
@@ -37,7 +36,6 @@ fun Text(
         textAlign = textAlign,
         maxLines = maxLines,
         overflow = overflow,
-        fontFamily = fontFamily,
         onTextLayout = onTextLayout,
     )
 }
@@ -55,11 +53,14 @@ fun Text(
     onTextLayout: ((TextLayoutResult) -> Unit)? = null,
 ) {
     val contentAlpha = LocalContentAlpha.current
+    val textStyle = style.merge(LocalTextStyle.current)
+    val textColor: Color = LocalTextColor.current
+        .takeIf { it != Color.Unspecified } ?: color ?: KrailTheme.colors.onSurface
+
     BasicText(
         text = text,
-        style = style.merge(
-            color = color?.copy(alpha = contentAlpha)
-                ?: LocalTextColor.current.copy(alpha = contentAlpha),
+        style = textStyle.copy(
+            color = textColor.copy(alpha = contentAlpha),
             textAlign = textAlign,
             fontFamily = fontFamily,
         ),

taj/src/commonMain/kotlin/xyz/ksharma/krail/taj/theme/KrailTypography.kt

@@ -2,6 +2,7 @@ package xyz.ksharma.krail.taj.theme
 
 import androidx.compose.runtime.Immutable
 import androidx.compose.runtime.staticCompositionLocalOf
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.text.font.FontFamily
 import androidx.compose.ui.text.font.FontWeight