Sonar theme = Android's real default: teal 4FD1C5 accent (not coral), dark ink on teal, logo tile #0B1220 with teal hairline, single-accent-color ping logo; icon.png regenerated teal-on-#0B1220 to match Android launcher

app/src/main/kotlin/com/shonar/desktop/Theme.kt

@@ -77,6 +77,11 @@ data class ShonarPalette(
     /** Vertical page gradient endpoints; default flat = [background]. */
     val backgroundTop: Color = background,
     val backgroundBottom: Color = background,
+    /** Header logo-tile treatment; default = the generic surface/border
+     *  look. The Sonar theme overrides these to Android's launcher
+     *  treatment: #0B1220 tile with a teal hairline. */
+    val tileBackground: Color = surface,
+    val tileBorder: Color = border,
 )
 
 /** Charcoal with a faint blue cast, per the reference: page #16181C,
@@ -126,29 +131,31 @@ private val LightPalette = ShonarPalette(
 )
 
 /** The Android companion app's palette (android/.../ui/theme/Theme.kt):
- *  deep-sea sonar navy + the phone's coral accent (#E76F51), flat
- *  background (no gradient). Values are 1:1 with the Android tokens:
- *  DeepNavy/NavySurface/NavyElevated/BorderDark/TextPrimary-Dark etc.
- *  Android derives ink-on-accent from luminance; coral (0.29) < 0.4 →
- *  white, matching the phone. Kept in sync by hand — if Android's
- *  palette changes, change this too. */
+ *  deep-sea sonar navy + teal accent — the app's built-in default,
+ *  exactly what the phone shows (screenshot Sep 21). Values are 1:1
+ *  with the Android tokens: DeepNavy/NavySurface/NavyElevated/
+ *  BorderDark/Teal etc. Android derives ink-on-accent from luminance;
+ *  teal (0.55) > 0.4 → Ink, matching the phone. Kept in sync by hand —
+ *  if Android's palette changes, change this too. */
 private val SonarPalette = ShonarPalette(
     background = Color(0xFF070D18),      // DeepNavy
     surface = Color(0xFF0F1A2B),         // NavySurface
     surfaceAlt = Color(0xFF16233A),      // NavyElevated
     border = Color(0xFF22364F),          // BorderDark
-    accent = Color(0xFFE76F51),          // phone's accent_color setting
-    accentStrong = Color(0xFFC95B41),    // filled-accent hover depth
-    accentGlow = Color(0x33E76F51),      // soft halo (~20% coral)
-    inkOnAccent = Color(0xFFF4F8FF),     // Android: white on coral
+    accent = Color(0xFF4FD1C5),          // Android Teal (default accent)
+    accentStrong = Color(0xFF2A9D94),    // Android TealDark
+    accentGlow = Color(0x334FD1C5),      // soft halo (~20% teal)
+    inkOnAccent = Color(0xFF10141A),     // Android Ink: dark on bright teal
     textPrimary = Color(0xFFE6EDF3),
     textSecondary = Color(0xFF9FB3C8),
     textMuted = Color(0xFF6B7E94),
     error = Color(0xFFFF6B6B),           // Android ErrorDark
     onError = Color(0xFF10141A),         // Android Ink
     // Android's background is flat — no gradient.
-    highlight = Color(0xFFFF8A70),       // warm coral-tint for title text
-    highlightTint = Color(0xFF3A1D16),   // coral row wash on navy
+    tileBackground = Color(0xFF0B1220),  // Android ic_launcher_background
+    tileBorder = Color(0xFF4FD1C5),      // teal hairline tile, per phone header
+    highlight = Color(0xFF5EEAD4),       // TealBright for title text
+    highlightTint = Color(0xFF0B2E26),   // deep teal row wash on navy
 )
 
 /** Which palette the app renders in. Persisted as "sonar" / "meridian"
@@ -411,42 +418,40 @@ fun ShonarTheme(
  */
 @Composable
 fun SonarLogo(size: Dp = 32.dp, modifier: Modifier = Modifier) {
-    // Brand blue — same #6190E5 as the launcher icon and the theme's
-    // interactive accent, per the user's request (Sep 21).
-    val accent = Shonar.BrandBlue
-    val accentStrong = Shonar.BrandBlueDeep
+    // Single-color glyph like Android's launcher foreground (teal under
+    // Sonar): logo and UI accent can never disagree.
+    val accent = Shonar.Accent
     Canvas(modifier = modifier.size(size)) {
         val s = this.size.minDimension / 108f
         fun c(x: Float, y: Float) = Offset(x * s, y * s)
         // Center dot: r=6 at (54,54)
         drawCircle(accent, radius = 6f * s, center = c(54f, 54f))
-        // Upper-right quarter arcs (teal), centered on the dot.
         val arcStyle = Stroke(width = 4f * s, cap = StrokeCap.Round)
-        fun arc(color: Color, startDeg: Float, boxTopLeft: Float) {
+        fun arc(startDeg: Float, boxTopLeft: Float) {
             val box = when (boxTopLeft) { 38f -> 32f; else -> 56f }
             drawArc(
-                color, startAngle = startDeg, sweepAngle = 90f, useCenter = false,
+                accent, startAngle = startDeg, sweepAngle = 90f, useCenter = false,
                 topLeft = c(boxTopLeft, boxTopLeft),
                 size = androidx.compose.ui.geometry.Size(box * s, box * s),
                 style = arcStyle,
             )
         }
-        arc(accent, -90f, 38f)
-        arc(accent, -90f, 26f)
-        // Lower-left quarter arcs (teal-dark).
-        arc(accentStrong, 90f, 38f)
-        arc(accentStrong, 90f, 26f)
+        arc(-90f, 38f)
+        arc(-90f, 26f)
+        arc(90f, 38f)
+        arc(90f, 26f)
     }
 }
 
-/** The reference header's logo treatment: ping inside a hairline
- *  rounded tile. */
+/** The header's logo treatment: ping inside a rounded tile. Under the
+ *  Sonar theme this is Android's launcher look — teal ping on #0B1220
+ *  with a teal hairline border. */
 @Composable
 fun SonarLogoTile(modifier: Modifier = Modifier, size: Dp = 40.dp) {
     Surface(
         modifier = modifier.size(size)
-            .border(Shonar.BorderW, Shonar.Border, Shonar.ShapeCard),
-        color = Shonar.Surface,
+            .border(Shonar.BorderW, Shonar.LocalPalette.current.tileBorder, Shonar.ShapeCard),
+        color = Shonar.LocalPalette.current.tileBackground,
         shape = Shonar.ShapeCard,
     ) {
         Column(