redesign: modern indigo UI, new app icon, edge-to-edge theme

App icon: deep indigo-to-violet gradient background with white sync arrows;
replaced flat #2196F3 with layered adaptive icon.

Theme: disabled dynamic color; rich indigo/teal/amber Material3 palette;
edge-to-edge with transparent status bar; tighter typography letterSpacing.

HomeScreen: colored left accent bar per status; URL-decoded SAF paths;
relative timestamps (Just now / N min ago / N hr ago); indigo status pills;
FilledTonalButton empty state.

PairDetailScreen: hero StatusBanner with large icon and relative time;
InfoCard as bordered grid with icon backgrounds; colored dot event timeline;
URL-decoded local path display.

SettingsScreen: section headers with primary left bar; AccountCard with
primaryContainer icon backgrounds; Security/About in bordered cards.

Bump version to 1.0.13 (code 14).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/src/main/kotlin/com/syncflow/ui/theme/Color.kt

@@ -2,8 +2,27 @@ package com.syncflow.ui.theme
 
 import androidx.compose.ui.graphics.Color
 
-val SyncBlue = Color(0xFF2196F3)
-val SyncGreen = Color(0xFF4CAF50)
-val SyncOrange = Color(0xFFFF9800)
-val SyncRed = Color(0xFFF44336)
-val SyncPurple = Color(0xFF9C27B0)
+// Primary — indigo
+val Indigo600  = Color(0xFF4F46E5)
+val Indigo900  = Color(0xFF312E81)
+val Indigo100  = Color(0xFFE0E7FF)
+val Indigo50   = Color(0xFFEEF2FF)
+
+// Secondary — teal
+val Teal600    = Color(0xFF0D9488)
+val Teal100    = Color(0xFFCCFBF1)
+
+// Tertiary — amber
+val Amber500   = Color(0xFFF59E0B)
+val Amber100   = Color(0xFFFEF3C7)
+
+// Neutrals
+val Slate50    = Color(0xFFF8FAFC)
+val Slate100   = Color(0xFFF1F5F9)
+val Slate200   = Color(0xFFE2E8F0)
+val Slate600   = Color(0xFF475569)
+val Slate900   = Color(0xFF0F172A)
+
+// Semantic
+val GreenSuccess = Color(0xFF16A34A)
+val RedError     = Color(0xFFDC2626)

app/src/main/kotlin/com/syncflow/ui/theme/Theme.kt

@@ -1,50 +1,77 @@
 package com.syncflow.ui.theme
 
 import android.app.Activity
-import android.os.Build
 import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.material3.*
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.SideEffect
-import androidx.compose.ui.graphics.toArgb
-import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalView
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.sp
 import androidx.core.view.WindowCompat
 
 private val LightColors = lightColorScheme(
-    primary = SyncBlue,
-    onPrimary = androidx.compose.ui.graphics.Color.White,
-    secondary = SyncGreen,
-    tertiary = SyncPurple,
+    primary            = Indigo600,
+    onPrimary          = Color.White,
+    primaryContainer   = Indigo100,
+    onPrimaryContainer = Indigo900,
+    secondary          = Teal600,
+    onSecondary        = Color.White,
+    secondaryContainer = Teal100,
+    tertiary           = Amber500,
+    tertiaryContainer  = Amber100,
+    background         = Slate50,
+    surface            = Color.White,
+    surfaceVariant     = Slate100,
+    onSurfaceVariant   = Slate600,
+    error              = RedError,
+    errorContainer     = Color(0xFFFEE2E2),
+    outline            = Slate200,
 )
 
 private val DarkColors = darkColorScheme(
-    primary = SyncBlue,
-    secondary = SyncGreen,
-    tertiary = SyncPurple,
+    primary            = Color(0xFF818CF8),
+    onPrimary          = Indigo900,
+    primaryContainer   = Color(0xFF3730A3),
+    onPrimaryContainer = Indigo100,
+    secondary          = Color(0xFF2DD4BF),
+    onSecondary        = Color(0xFF003731),
+    secondaryContainer = Color(0xFF00504A),
+    tertiary           = Amber500,
+    tertiaryContainer  = Color(0xFF92400E),
+    background         = Color(0xFF0F0F1A),
+    surface            = Color(0xFF1A1A2E),
+    surfaceVariant     = Color(0xFF252538),
+    onSurfaceVariant   = Color(0xFF94A3B8),
+    error              = Color(0xFFF87171),
+    errorContainer     = Color(0xFF7F1D1D),
+    outline            = Color(0xFF334155),
+)
+
+private val AppTypography = Typography(
+    titleLarge  = TextStyle(fontWeight = FontWeight.Bold,     fontSize = 22.sp, letterSpacing = (-0.5).sp),
+    titleMedium = TextStyle(fontWeight = FontWeight.SemiBold, fontSize = 16.sp, letterSpacing = (-0.25).sp),
+    titleSmall  = TextStyle(fontWeight = FontWeight.SemiBold, fontSize = 14.sp, letterSpacing = 0.sp),
+    labelMedium = TextStyle(fontWeight = FontWeight.Medium,   fontSize = 12.sp, letterSpacing = 0.1.sp),
+    labelSmall  = TextStyle(fontWeight = FontWeight.Medium,   fontSize = 11.sp, letterSpacing = 0.1.sp),
 )
 
 @Composable
 fun SyncFlowTheme(
     darkTheme: Boolean = isSystemInDarkTheme(),
-    dynamicColor: Boolean = true,
     content: @Composable () -> Unit,
 ) {
-    val colorScheme = when {
-        dynamicColor && Build.VERSION.SDK_INT >= Build.VERSION_CODES.S -> {
-            val ctx = LocalContext.current
-            if (darkTheme) dynamicDarkColorScheme(ctx) else dynamicLightColorScheme(ctx)
-        }
-        darkTheme -> DarkColors
-        else -> LightColors
-    }
+    val colorScheme = if (darkTheme) DarkColors else LightColors
     val view = LocalView.current
     if (!view.isInEditMode) {
         SideEffect {
             val window = (view.context as Activity).window
-            window.statusBarColor = colorScheme.primary.toArgb()
+            WindowCompat.setDecorFitsSystemWindows(window, false)
+            window.statusBarColor = android.graphics.Color.TRANSPARENT
             WindowCompat.getInsetsController(window, view).isAppearanceLightStatusBars = !darkTheme
         }
     }
-    MaterialTheme(colorScheme = colorScheme, typography = Typography(), content = content)
+    MaterialTheme(colorScheme = colorScheme, typography = AppTypography, content = content)
 }