Three stops — purple into blue into black — matches ios!144

#3A1E9E purple, #0B3080 blue, #070A1A black, top down. Less purple than the
two-stop version, because the purple is a third of the sweep rather than half.

🔴 One card colour against three stops has to lift off all three. #0E1745
looked right against the purple and the blue and measured 1.15:1 against the
black end — a card that disappears at the bottom of a long screen. #141C52
lifts 1.41 / 1.33 / 1.23.

The palette test checks the middle stop too. A three-stop gradient checked only
at its ends is two thirds measured, and the middle is where most of a screen
actually sits.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

app/src/main/kotlin/io/flamenet/messenger/app/Theme.kt

@@ -79,11 +79,12 @@ object Palette {
     // the top and 8.4:1 at the bottom, secondary text 8.1:1 and 5.5:1 — the
     // bottom stop binds, and it is where most of the explanatory copy sits.
     // White cards lift off the bottom at 2.4:1, which keeps a card a card.
-    val GroundTop = Color(0xFF3A0CA3)
-    val GroundBottom = Color(0xFF062C8C)
+    val GroundTop = Color(0xFF3A1E9E)     // purple
+    val GroundMid = Color(0xFF0B3080)     // blue
+    val GroundBottom = Color(0xFF070A1A)  // black
     // Kept as the same two colours: there is one theme now.
-    val NightGroundTop = Color(0xFF3A0CA3)
-    val NightGroundBottom = Color(0xFF062C8C)
+    val NightGroundTop = Color(0xFF3A1E9E)
+    val NightGroundBottom = Color(0xFF070A1A)
 
     val Teal = Color(0xFF4BE3C0)   // success and presence
     val Pink = Color(0xFFFF819F)   // the kit's alert accent
@@ -93,13 +94,13 @@ object Palette {
     // ⚠️ Still needed where a gradient cannot go (a single Color parameter, a
     // system bar tint). This is the gradient's mid-tone, so the two never read
     // as different surfaces.
-    val Mist = Color(0xFF201C98)        // the page ground, flat
-    val SurfaceAlt = Color(0xFF2A1875)  // received bubbles, pills, bands
-    val IncomingBubble = Color(0xFF2A1875)
+    val Mist = Color(0xFF191D68)        // the page ground, flat
+    val SurfaceAlt = Color(0xFF1E2A70)  // received bubbles, pills, bands
+    val IncomingBubble = Color(0xFF1E2A70)
     // ⚠️ A blue-tinted grey rather than the flat #F3F3F3: an initials avatar
     // needs to read as a circle against the surface behind it, and two greys a
     // shade apart do not.
-    val AvatarFill = Color(0xFF31207F)
+    val AvatarFill = Color(0xFF243480)
     // 🔴 **Darkened with the ground, not left behind it.** #505C69 read 5.0:1
     // on the old bottom stop and only 3.5:1 on the darker one — below AA, and
     // most of the explanatory copy on these screens is set in it. Measured now:
@@ -126,8 +127,12 @@ object Palette {
     // card lighter than a saturated violet has to be lighter still than that,
     // which puts secondary text below AA on it. Recessed panels invert the
     // problem: the gradient is the bright thing, content sits in dark wells.
-    val InkSurface = Color(0xFF190B4E)   // --panel
-    val NightGround = Color(0xFF201C98)  // --bg, the gradient's mid-tone
+    // 🔴 One card colour against a THREE-stop ground, so it must lift off all
+    // three. #0E1745 looked right against the purple and the blue and measured
+    // 1.15:1 against the black end — a card that disappears at the bottom of a
+    // long screen. This lifts 1.41 / 1.33 / 1.23.
+    val InkSurface = Color(0xFF141C52)   // --panel
+    val NightGround = Color(0xFF191D68)  // --bg, the gradient's mid-tone
 }
 
 /**
@@ -142,7 +147,8 @@ fun groundBrush(): Brush =
     // One theme, so no branch. The Night* pair is kept pointing at the same two
     // colours rather than deleted, because several screens name it directly and
     // a rename across both apps is a separate change.
-    Brush.verticalGradient(listOf(Palette.GroundTop, Palette.GroundBottom))
+    Brush.verticalGradient(
+        listOf(Palette.GroundTop, Palette.GroundMid, Palette.GroundBottom))
 
 /** The primary action's fill. Matches `Theme.primaryGradient*` on iOS. */
 fun accentBrush(): Brush =