fix(chat): tint composer send/stop/mic button with theme primary (#1410)

app/src/test/java/com/m57/hermescontrol/ui/chat/ComposerPaletteTest.kt

@@ -2,6 +2,7 @@ package com.m57.hermescontrol.ui.chat.components
 
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.luminance
+import com.m57.hermescontrol.theme.GlyphWhite
 import com.m57.hermescontrol.theme.ThemePreset
 import com.m57.hermescontrol.theme.resolveColorScheme
 import org.junit.Assert.assertTrue
@@ -66,6 +67,20 @@ class ComposerPaletteTest {
         }
     }
 
+    @Test
+    fun actionButtonFollowsThePresetPrimaryWhenItIsLegible() {
+        forEveryPresetMode { mode, p, _ ->
+            val scheme = resolveColorScheme(ThemePreset.valueOf(mode.substringBefore(" ")), mode.endsWith("true"))
+            if (contrast(scheme.primary, p.card) >= 3f) {
+                assertTrue("$mode action must be primary", p.action == scheme.primary)
+                assertTrue(
+                    "$mode glyph must be white or onPrimary",
+                    p.onAction == scheme.onPrimary || p.onAction == GlyphWhite,
+                )
+            }
+        }
+    }
+
     @Test
     fun controlsAndCardEdgeStayVisibleInEveryPresetMode() {
         forEveryPresetMode { mode, p, background ->