feat: visual refresh — lighter typography, message animations, richer themes

Typography: body text W400→W300 for airier feel, headings scaled up
(H1 26sp, H2 22sp, H3 18sp), W600/W500 weight hierarchy for contrast.

Animations: animateItem() on LazyColumn messages — 350ms fade-in,
spring placement, 200ms fade-out.

Themes: blobs 20% larger + better full-screen distribution, higher
alpha on OLED (0.48 peak), light mode factor 0.65→0.78, reduced
vignette, distinct primaryDeep per theme for richer gradients.

app/src/main/java/dev/kaizen/app/chat/Background.kt

@@ -45,7 +45,7 @@ fun MeshBackground(animateBlobs: Boolean = true, content: @Composable BoxScope.(
     val dark = isSystemInDarkTheme()
     val accent = LocalKaizenAccent.current
     val base = MaterialTheme.colorScheme.background
-    val factor = if (dark) 1f else 0.65f
+    val factor = if (dark) 1f else 0.78f
 
     val drift = if (animateBlobs) {
         val transition = rememberInfiniteTransition(label = "blobs")
@@ -70,14 +70,14 @@ fun MeshBackground(animateBlobs: Boolean = true, content: @Composable BoxScope.(
                 drawRect(brush = ditherBrush, alpha = DITHER_ALPHA)
             },
     ) {
-        Blob(accent.blob1, 360.dp, (-60f + drift * 30f).dp, (-40f + drift * 24f).dp, 0.42f * factor)
+        Blob(accent.blob1, 440.dp, (-80f + drift * 40f).dp, (-60f + drift * 30f).dp, 0.48f * factor)
-        Blob(accent.blob2, 380.dp, (170f - drift * 44f).dp, (150f + drift * 40f).dp, 0.36f * factor)
+        Blob(accent.blob2, 460.dp, (140f - drift * 50f).dp, (200f + drift * 50f).dp, 0.40f * factor)
-        Blob(accent.blob3, 320.dp, (220f + drift * 36f).dp, (80f - drift * 28f).dp, 0.30f * factor)
+        Blob(accent.blob3, 400.dp, (-30f + drift * 60f).dp, (450f - drift * 40f).dp, 0.36f * factor)
-        Blob(accent.blob4, 300.dp, (30f + drift * 50f).dp, (560f - drift * 36f).dp, 0.34f * factor)
+        Blob(accent.blob4, 420.dp, (180f + drift * 40f).dp, (620f - drift * 44f).dp, 0.38f * factor)
         if (dark) {
             Box(
                 Modifier.fillMaxSize().background(
-                    Brush.radialGradient(listOf(Color.Transparent, base.copy(alpha = 0.40f))),
+                    Brush.radialGradient(listOf(Color.Transparent, base.copy(alpha = 0.35f))),
                 ),
             )
         }

app/src/main/java/dev/kaizen/app/chat/ChatComponents.kt

@@ -135,11 +135,11 @@ fun EmptyHero(userName: String, onPick: (String) -> Unit, modifier: Modifier = M
     ) {
         KaizenOrb(104.dp)
         Spacer(Modifier.height(24.dp))
-        Text("${greeting(now.hour)}, $userName", color = cs.onSurfaceVariant, fontSize = 17.sp)
+        Text("${greeting(now.hour)}, $userName", color = cs.onSurfaceVariant, fontSize = 17.sp, fontWeight = FontWeight.W300)
         Spacer(Modifier.height(6.dp))
-        Text(stringResource(R.string.hero_headline), color = cs.onBackground, fontSize = 32.sp, fontWeight = FontWeight.Bold)
+        Text(stringResource(R.string.hero_headline), color = cs.onBackground, fontSize = 32.sp, fontWeight = FontWeight.W600)
         Spacer(Modifier.height(8.dp))
-        Text(dateLine, color = cs.onSurfaceVariant.copy(alpha = 0.7f), fontSize = 13.sp)
+        Text(dateLine, color = cs.onSurfaceVariant.copy(alpha = 0.7f), fontSize = 13.sp, fontWeight = FontWeight.W300)
     }
 }
 
@@ -520,7 +520,7 @@ fun MessageRow(
                         if (hasAttachments) AttachmentGrid(message.attachments, Modifier.padding(6.dp))
                         if (message.content.isNotBlank()) {
                             Text(
-                                message.content, color = cs.onBackground, fontSize = 16.sp, lineHeight = 26.sp,
+                                message.content, color = cs.onBackground, fontSize = 16.sp, lineHeight = 26.sp, fontWeight = FontWeight.W300,
                                 modifier = Modifier.padding(start = 16.dp, end = 16.dp, top = if (hasAttachments) 4.dp else 13.dp, bottom = 13.dp),
                             )
                         }
@@ -784,10 +784,11 @@ fun ChatInput(
                         stringResource(R.string.chat_input_placeholder),
                         color = cs.onSurfaceVariant.copy(alpha = 0.5f),
                         fontSize = 16.sp,
+                        fontWeight = FontWeight.W300,
                     )
                     BasicTextField(
                         value = value, onValueChange = onValueChange,
-                        textStyle = TextStyle(color = cs.onBackground, fontSize = 16.sp, lineHeight = 24.sp),
+                        textStyle = TextStyle(color = cs.onBackground, fontSize = 16.sp, lineHeight = 24.sp, fontWeight = FontWeight.W300),
                         cursorBrush = SolidColor(accent.primary), maxLines = 6, modifier = Modifier.fillMaxWidth(),
                     )
                 }

app/src/main/java/dev/kaizen/app/chat/ChatScreen.kt

@@ -88,6 +88,9 @@ import android.media.MediaPlayer
 import android.media.MediaRecorder
 import android.widget.Toast
 import androidx.core.content.ContextCompat
+import androidx.compose.animation.core.Spring
+import androidx.compose.animation.core.spring
+import androidx.compose.animation.core.tween
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.async
 import kotlinx.coroutines.launch
@@ -866,6 +869,11 @@ fun ChatScreen(
                                 verticalArrangement = Arrangement.spacedBy(24.dp),
                             ) {
                                 items(messages, key = { it.id }) { message ->
+                                    Box(Modifier.animateItem(
+                                        fadeInSpec = tween(350),
+                                        placementSpec = spring(stiffness = Spring.StiffnessMediumLow),
+                                        fadeOutSpec = tween(200),
+                                    )) {
                                     MessageRow(
                                         message = message,
                                         onDelete = if (conversationId != null && !isStreaming) { wireId ->
@@ -904,6 +912,7 @@ fun ChatScreen(
                                         } else null,
                                         isPlayingTts = playingTtsForId == message.id,
                                     )
+                                    }
                                 }
                             }
 
@@ -1014,7 +1023,7 @@ fun ChatScreen(
                                                 modelDisplayName(displayModel, models),
                                                 color = MaterialTheme.colorScheme.onBackground,
                                                 fontSize = 13.sp,
-                                                fontWeight = FontWeight.Medium,
+                                                fontWeight = FontWeight.W300,
                                                 maxLines = 1,
                                                 modifier = Modifier.widthIn(max = 180.dp),
                                                 overflow = androidx.compose.ui.text.style.TextOverflow.Ellipsis,

app/src/main/java/dev/kaizen/app/chat/Markdown.kt

@@ -461,9 +461,9 @@ fun MarkdownText(text: String, streaming: Boolean = false, modifier: Modifier =
                     if (idx > 0) Spacer(Modifier.height(18.dp))
                     val rendered = inlineMarkdown(block.text + if (isLast) cursor else "", cs.onBackground, inlineCodeColor, inlineCodeBg, linkColor)
                     ClickableMarkdownText(rendered, context, cs.onBackground,
-                        fontSize = when (block.level) { 1 -> 22.sp; 2 -> 19.sp; else -> 17.sp },
+                        fontSize = when (block.level) { 1 -> 26.sp; 2 -> 22.sp; else -> 18.sp },
-                        fontWeight = FontWeight.Bold,
+                        fontWeight = when (block.level) { 1 -> FontWeight.W600; 2 -> FontWeight.W600; else -> FontWeight.W500 },
-                        lineHeight = when (block.level) { 1 -> 30.sp; 2 -> 27.sp; else -> 24.sp },
+                        lineHeight = when (block.level) { 1 -> 34.sp; 2 -> 30.sp; else -> 26.sp },
                     )
                     Spacer(Modifier.height(8.dp))
                 }
@@ -592,7 +592,7 @@ fun MarkdownText(text: String, streaming: Boolean = false, modifier: Modifier =
                             val appendCursor = isLast && itemIdx == block.items.lastIndex
                             val rendered = inlineMarkdown(item.text + if (appendCursor) cursor else "", cs.onBackground, inlineCodeColor, inlineCodeBg, linkColor)
                             ClickableMarkdownText(rendered, context, cs.onBackground,
-                                fontSize = 16.sp, lineHeight = 26.sp,
+                                fontSize = 16.sp, lineHeight = 26.sp, fontWeight = FontWeight.W300,
                                 modifier = Modifier.weight(1f),
                             )
                         }
@@ -641,7 +641,7 @@ fun MarkdownText(text: String, streaming: Boolean = false, modifier: Modifier =
                     if (idx > 0) Spacer(Modifier.height(12.dp))
                     val rendered = inlineMarkdown(block.text + if (isLast) cursor else "", cs.onBackground, inlineCodeColor, inlineCodeBg, linkColor)
                     ClickableMarkdownText(rendered, context, cs.onBackground,
-                        fontSize = 16.sp, lineHeight = 26.sp,
+                        fontSize = 16.sp, lineHeight = 26.sp, fontWeight = FontWeight.W300,
                     )
                 }
 

app/src/main/java/dev/kaizen/app/ui/theme/Type.kt

@@ -88,14 +88,14 @@ val Typography = Typography(
     ),
     bodyLarge = TextStyle(
         fontFamily = InterVariable,
-        fontWeight = FontWeight.W400,
+        fontWeight = FontWeight.W300,
         fontSize = 16.sp,
         lineHeight = 24.sp,
         letterSpacing = 0.08.sp,
     ),
     bodyMedium = TextStyle(
         fontFamily = InterVariable,
-        fontWeight = FontWeight.W400,
+        fontWeight = FontWeight.W300,
         fontSize = 14.sp,
         lineHeight = 20.sp,
         letterSpacing = 0.11.sp,

app/src/main/java/dev/kaizen/app/ui/theme/themes/AmberTheme.kt

@@ -12,7 +12,7 @@ val AmberTheme = KaizenThemeSpec(
     label = "Amber",
     light = KaizenAccentScheme(
         primary     = p3(0.811f, 0.608f, 0.126f),  // oklch(0.72 0.14 83)
-        primaryDeep = p3(0.811f, 0.608f, 0.126f),
+        primaryDeep = p3(0.680f, 0.480f, 0.050f),  // oklch(0.62 0.15 83) richer gold
         onPrimary   = p3(0.015f, 0.013f, 0.009f),  // oklch(0.10 0.005 83)
         ring        = p3(0.811f, 0.608f, 0.126f),
         blob1       = p3(0.992f, 0.767f, 0.282f),  // oklch(0.85 0.15 83)  gold

app/src/main/java/dev/kaizen/app/ui/theme/themes/AuroraTheme.kt

@@ -14,7 +14,7 @@ val AuroraTheme = KaizenThemeSpec(
     label = "Aurora",
     light = KaizenAccentScheme(
         primary     = p3(0.724f, 0.328f, 0.812f),  // oklch(0.62 0.20 320) purple
-        primaryDeep = p3(0.724f, 0.328f, 0.812f),
+        primaryDeep = p3(0.580f, 0.200f, 0.700f),  // oklch(0.50 0.22 320) deeper purple
         onPrimary   = p3(1.000f, 0.979f, 1.000f),  // oklch(0.99 0.01 320)
         ring        = p3(0.724f, 0.328f, 0.812f),
         blob1       = p3(0.855f, 0.540f, 0.926f),  // oklch(0.75 0.16 320) purple

app/src/main/java/dev/kaizen/app/ui/theme/themes/BlauTheme.kt

@@ -12,7 +12,7 @@ val BlauTheme = KaizenThemeSpec(
     label = "Blau",
     light = KaizenAccentScheme(
         primary     = p3(0.168f, 0.513f, 0.962f),  // oklch(0.62 0.19 257)
-        primaryDeep = p3(0.168f, 0.513f, 0.962f),
+        primaryDeep = p3(0.090f, 0.380f, 0.820f),  // oklch(0.52 0.20 257) deeper blue
         onPrimary   = p3(0.971f, 0.989f, 1.000f),  // oklch(0.99 0.01 257)
         ring        = p3(0.168f, 0.513f, 0.962f),
         blob1       = p3(0.464f, 0.725f, 1.000f),  // oklch(0.78 0.15 257) sky

app/src/main/java/dev/kaizen/app/ui/theme/themes/MonoTheme.kt

@@ -12,7 +12,7 @@ val MonoTheme = KaizenThemeSpec(
     label = "Mono",
     light = KaizenAccentScheme(
         primary     = p3(0.104f, 0.104f, 0.104f),  // oklch(0.22 0 255)  near-black
-        primaryDeep = p3(0.104f, 0.104f, 0.104f),
+        primaryDeep = p3(0.050f, 0.050f, 0.050f),  // oklch(0.14 0 255)  deeper black
         onPrimary   = p3(0.987f, 0.987f, 0.987f),  // oklch(0.99 0 255)  near-white
         ring        = p3(0.104f, 0.104f, 0.104f),
         blob1       = p3(0.806f, 0.806f, 0.806f),  // oklch(0.85 0 255) light gray