Run the preview plate the full row width (#163)

The plate now spans the same width as the option rows beneath it and takes
their outer radius, so preview and options read as one stack instead of a
card floating over a list.

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/ViewPreview.kt

@@ -26,6 +26,7 @@ import androidx.compose.ui.semantics.clearAndSetSemantics
 import androidx.compose.ui.unit.Constraints
 import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
+import de.jeanlucmakiola.floret.components.GroupedListInset
 import de.jeanlucmakiola.floret.identity.rememberReduceMotion
 import kotlin.math.roundToInt
 
@@ -97,13 +98,17 @@ internal fun ScaledViewPreview(
 }
 
 /**
- * The bezel every preview picker frames its preview with, cross-fading as
- * [selected] changes.
+ * The stage every preview picker sets its preview on, cross-fading as [selected]
+ * changes.
  *
  * A preview draws the app's own surface, so on a chooser screen — which draws the
- * same surface — it had no edge of its own and dissolved into the page. The tonal
- * ring gives it one: the preview reads as a screen being shown rather than as
- * part of the screen showing it.
+ * same surface — it had no edge of its own and dissolved into the page. A tonal
+ * plate gives it one: the preview reads as a screen being shown rather than as
+ * part of the screen showing it. The plate takes the width and the outer radius
+ * of the grouped rows underneath, so the two read as one stack.
+ *
+ * Only vertical spacing is the caller's to pass — the horizontal inset is the
+ * rows' own, and the alignment is the point.
  */
 @Composable
 internal fun <T> ViewPreviewFrame(
@@ -114,35 +119,35 @@ internal fun <T> ViewPreviewFrame(
 ) {
     val reduceMotion = rememberReduceMotion()
     Box(
-        modifier = modifier.fillMaxWidth(),
+        modifier = modifier
+            .fillMaxWidth()
+            .padding(horizontal = GroupedListInset)
+            .clip(FRAME_SHAPE)
+            .background(MaterialTheme.colorScheme.surfaceContainerHigh)
+            .padding(FRAME_INSET),
         contentAlignment = Alignment.Center,
     ) {
-        Box(
-            modifier = Modifier
-                .clip(FRAME_SHAPE)
-                .background(MaterialTheme.colorScheme.surfaceContainerHigh)
-                .padding(FRAME_INSET),
-        ) {
-            Crossfade(
-                targetState = selected,
-                animationSpec = if (reduceMotion) snap() else tween(durationMillis = 250),
-                label = label,
-            ) { shown ->
-                // Each preview renders the real view at phone size and scales it
-                // down, so its own corners are square — the frame rounds them.
-                Box(
-                    modifier = Modifier
-                        .clip(PREVIEW_SHAPE)
-                        .background(MaterialTheme.colorScheme.surface)
-                        .clipToBounds(),
-                ) {
-                    content(shown)
-                }
+        Crossfade(
+            targetState = selected,
+            animationSpec = if (reduceMotion) snap() else tween(durationMillis = 250),
+            label = label,
+        ) { shown ->
+            // Each preview renders the real view at phone size and scales it
+            // down, so its own corners are square — the plate rounds them.
+            Box(
+                modifier = Modifier
+                    .clip(PREVIEW_SHAPE)
+                    .background(MaterialTheme.colorScheme.surface)
+                    .clipToBounds(),
+            ) {
+                content(shown)
             }
         }
     }
 }
 
 private val FRAME_INSET = 8.dp
-private val FRAME_SHAPE = RoundedCornerShape(20.dp)
+
+/** The grouped rows' own outer radius, so the stack shares one silhouette. */
+private val FRAME_SHAPE = RoundedCornerShape(22.dp)
 private val PREVIEW_SHAPE = RoundedCornerShape(12.dp)

app/src/main/java/de/jeanlucmakiola/calendula/ui/onboarding/ViewStep.kt

@@ -197,10 +197,7 @@ private fun <T> StepPreview(selected: T, content: @Composable (T) -> Unit) {
     ViewPreviewFrame(
         selected = selected,
         label = "step-preview",
-        modifier = Modifier.padding(
-            horizontal = 12.dp,
-            vertical = OnboardingSpace.xs,
-        ).padding(bottom = OnboardingSpace.sm),
+        modifier = Modifier.padding(top = OnboardingSpace.xs, bottom = OnboardingSpace.md),
         content = content,
     )
 }

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/MonthViewStylePicker.kt

@@ -47,7 +47,7 @@ internal fun MonthViewStylePicker(
         ViewPreviewFrame(
             selected = selected,
             label = "month-style-preview",
-            modifier = Modifier.padding(horizontal = 12.dp, vertical = 8.dp),
+            modifier = Modifier.padding(vertical = 8.dp),
         ) { shown ->
             MonthStylePreview(
                 style = shown,

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/WeekStartPicker.kt

@@ -43,7 +43,7 @@ internal fun WeekStartPicker(
         ViewPreviewFrame(
             selected = resolved,
             label = "week-start-preview",
-            modifier = Modifier.padding(horizontal = 12.dp, vertical = 8.dp),
+            modifier = Modifier.padding(vertical = 8.dp),
         ) { day ->
             MonthStylePreview(
                 style = monthStyle,