feat: improve Markdown renderer typography and styling

- Increase body text line height from 1.30em to 1.50em for better readability
- Increase paragraph spacing from 18sp to 20sp for more breathing room
- Add explicit fontWeight to headings: Bold for H1-H2, SemiBold for H3-H4, Medium for H5-H6
- Add negative letterSpacing to H1-H2 for tighter display-style headings
- Widen heading size range (32sp-15sp vs 32sp-18sp) for clearer visual hierarchy
- Add internal padding to code blocks (16dp horizontal, 12dp vertical) so text isn't flush against borders
- Add vertical margin (4dp) around code blocks for separation from surrounding text
- Add line height (1.45em) to code block text for better readability
- Add letter spacing (0.3sp) to inline code for better monospace readability
- Fix light theme code block using DarkColorPalette instead of LightColorPalette for background

https://claude.ai/code/session_01PPExHNAdLqddiYsGZi1BgW

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/theme/Theme.kt

@@ -51,6 +51,7 @@ import androidx.compose.ui.text.TextLinkStyles
 import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.text.font.FontFamily
 import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.em
 import androidx.compose.ui.unit.sp
 import androidx.core.view.WindowCompat
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
@@ -301,14 +302,16 @@ val MarkDownStyleOnDark =
                     TextStyle(
                         fontFamily = FontFamily.Monospace,
                         fontSize = Font14SP,
+                        lineHeight = 1.45.em,
                     ),
                 modifier =
                     Modifier
-                        .padding(0.dp)
+                        .padding(vertical = 4.dp)
                         .fillMaxWidth()
                         .clip(shape = QuoteBorder)
                         .border(1.dp, DarkSubtleBorder, QuoteBorder)
-                        .background(DarkColorPalette.onSurface.copy(alpha = 0.05f)),
+                        .background(DarkColorPalette.onSurface.copy(alpha = 0.05f))
+                        .padding(horizontal = 16.dp, vertical = 12.dp),
             ),
         stringStyle =
             RichTextDefaults.stringStyle?.copy(
@@ -324,6 +327,7 @@ val MarkDownStyleOnDark =
                         fontFamily = FontFamily.Monospace,
                         fontSize = Font14SP,
                         background = DarkColorPalette.onSurface.copy(alpha = 0.22f),
+                        letterSpacing = 0.3.sp,
                     ),
             ),
     )
@@ -342,14 +346,16 @@ val MarkDownStyleOnLight =
                     TextStyle(
                         fontFamily = FontFamily.Monospace,
                         fontSize = Font14SP,
+                        lineHeight = 1.45.em,
                     ),
                 modifier =
                     Modifier
-                        .padding(0.dp)
+                        .padding(vertical = 4.dp)
                         .fillMaxWidth()
                         .clip(shape = QuoteBorder)
                         .border(1.dp, LightSubtleBorder, QuoteBorder)
-                        .background(DarkColorPalette.onSurface.copy(alpha = 0.05f)),
+                        .background(LightColorPalette.onSurface.copy(alpha = 0.05f))
+                        .padding(horizontal = 16.dp, vertical = 12.dp),
             ),
         stringStyle =
             RichTextDefaults.stringStyle?.copy(
@@ -365,6 +371,7 @@ val MarkDownStyleOnLight =
                         fontFamily = FontFamily.Monospace,
                         fontSize = Font14SP,
                         background = LightColorPalette.onSurface.copy(alpha = 0.12f),
+                        letterSpacing = 0.3.sp,
                     ),
             ),
     )

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/theme/Type.kt

@@ -61,9 +61,9 @@ val Font14SP = 14.sp
 val Font17SP = 17.sp
 val Font18SP = 18.sp
 
-val MarkdownTextStyle = TextStyle(lineHeight = 1.30.em)
+val MarkdownTextStyle = TextStyle(lineHeight = 1.50.em)
 
-val DefaultParagraphSpacing: TextUnit = 18.sp
+val DefaultParagraphSpacing: TextUnit = 20.sp
 
 internal val DefaultHeadingStyle: HeadingStyle = { level, textStyle ->
     when (level) {
@@ -71,48 +71,57 @@ internal val DefaultHeadingStyle: HeadingStyle = { level, textStyle ->
             Typography.displayLarge.copy(
                 fontSize = 32.sp,
                 lineHeight = 40.sp,
+                fontWeight = FontWeight.Bold,
+                letterSpacing = (-0.5).sp,
             )
         }
 
         1 -> {
             Typography.displayMedium.copy(
-                fontSize = 28.sp,
+                fontSize = 26.sp,
-                lineHeight = 36.sp,
+                lineHeight = 34.sp,
+                fontWeight = FontWeight.Bold,
+                letterSpacing = (-0.25).sp,
             )
         }
 
         2 -> {
             Typography.displaySmall.copy(
-                fontSize = 26.sp,
+                fontSize = 22.sp,
-                lineHeight = 34.sp,
+                lineHeight = 30.sp,
+                fontWeight = FontWeight.SemiBold,
             )
         }
 
         3 -> {
             Typography.displaySmall.copy(
-                fontSize = 24.sp,
+                fontSize = 20.sp,
-                lineHeight = 32.sp,
+                lineHeight = 28.sp,
+                fontWeight = FontWeight.SemiBold,
             )
         }
 
         4 -> {
             Typography.headlineLarge.copy(
-                fontSize = 22.sp,
+                fontSize = 18.sp,
-                lineHeight = 26.sp,
+                lineHeight = 24.sp,
+                fontWeight = FontWeight.Medium,
             )
         }
 
         5 -> {
             Typography.headlineMedium.copy(
-                fontSize = 20.sp,
+                fontSize = 16.sp,
-                lineHeight = 24.sp,
+                lineHeight = 22.sp,
+                fontWeight = FontWeight.Medium,
             )
         }
 
         6 -> {
             Typography.headlineSmall.copy(
-                fontSize = 18.sp,
+                fontSize = 15.sp,
-                lineHeight = 22.sp,
+                lineHeight = 20.sp,
+                fontWeight = FontWeight.Medium,
             )
         }