fixed missing period times in the ios widget ruler and unreadable tiles on tinted and clear home screens

A .systemLarge widget only gets ~27pt per period, below the 30pt threshold
shared with Android, so iOS now shows the times from 24pt with a tighter
cell. In non-full-color rendering modes the opaque tiles and the today
circle flattened into solid slabs hiding their text; they are drawn
translucent with an outline there and use the light-text palette.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

ios/TimetableWidgetExtension/TimetableDayView.swift

@@ -147,7 +147,8 @@ struct PeriodRuler: View {
                 .font(.system(size: timeFont))
                 .foregroundStyle(palette.textSecondary)
                 .lineLimit(1)
-                .padding(.vertical, 2)
+                .minimumScaleFactor(0.8)
+                .padding(.vertical, 1)
             }
         }
         .frame(width: RULER_WIDTH, height: height)
@@ -304,6 +305,8 @@ private struct LessonTile: View {
     let metrics: TileMetrics
     let layout: TileTextLayout
 
+    @Environment(\.widgetRenderingMode) private var renderingMode
+
     private static let cancelledRed =
         Color(red: 244 / 255, green: 67 / 255, blue: 54 / 255).opacity(200 / 255)
 
@@ -326,7 +329,7 @@ private struct LessonTile: View {
         .padding(.vertical, TILE_PADDING_V)
         .frame(maxWidth: .infinity, alignment: .topLeading)
         .frame(height: height, alignment: .topLeading)
-        .background(lesson.tileColor)
+        .background { tileBackground(shape) }
         .clipShape(shape)
         .overlay(alignment: .bottomTrailing) {
             if let count = lesson.siblingCount, count > 0 {
@@ -357,6 +360,22 @@ private struct LessonTile: View {
         .padding(.horizontal, TILE_MARGIN_H)
     }
 
+    /// Tinted / clear home screens flatten an opaque colour block into a
+    /// solid slab the white text disappears on; a translucent fill with an
+    /// outline keeps tile and text apart in every rendering mode.
+    @ViewBuilder
+    private func tileBackground(_ shape: RoundedRectangle) -> some View {
+        if renderingMode == .fullColor {
+            lesson.tileColor
+        } else {
+            ZStack {
+                shape.fill(Color.white.opacity(0.18))
+                shape.strokeBorder(Color.white.opacity(0.55), lineWidth: 1)
+            }
+            .widgetAccentable()
+        }
+    }
+
     private var titleRow: some View {
         HStack(alignment: .center, spacing: 3) {
             Text(layout.title)