fix(engine): fix classic-card corner label colours and HUD-band overlap

card_plugin: AndroidCornerLabel used CARD_FACE_COLOUR (dark ~#1a1a1a) as
the background and BLACK_SUIT_COLOUR (near-white) for clubs/spades text —
both designed for the Terminal theme. On classic PNG cards (white face),
this produced an ugly dark box with invisible black-suit text. Switch the
corner-label background to Color::WHITE and black-suit text to
CARD_FACE_COLOUR (dark ink on white), matching traditional card printing.

layout: HUD_BAND_HEIGHT on Android raised 80 → 112 px. The HUD column has
4 flex tiers plus 3 inter-tier gaps (4 px each) and a SPACE_2 = 8 px top
offset. With empty tiers still occupying gap height in Bevy's flex layout,
the actual rendered HUD could reach ~80 px, overlapping the top card row
by up to one text line. 112 px provides ~28 px clearance in the common
case (Tiers 1 + 3 visible) and remains workable even when Tier 1 wraps.

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

CLAUDE.md

@@ -355,7 +355,7 @@ Must always be handled explicitly:
 * The gesture/navigation bar at the bottom (≈132px physical on common
   devices) is inside the Bevy viewport; use `SafeAreaInsets.bottom` to
   avoid placing interactive elements in that zone
-* `HUD_BAND_HEIGHT` is 128px on Android (two-row wrap) vs 64px on desktop;
+* `HUD_BAND_HEIGHT` is 112px on Android vs 64px on desktop;
   layout constants are `#[cfg(target_os = "android")]` gated
 * JNI calls must use `attach_current_thread_permanently` — not
   `attach_current_thread` — to avoid detach-on-drop panics

solitaire_engine/src/card_plugin.rs

@@ -1147,11 +1147,13 @@ fn add_android_corner_label(
     let bg_w = font_size * 2.0;
     let bg_h = font_size * 1.25;
 
-    // Solid background that hides the card art's small corner label.
+    // Background covers the PNG's baked-in small corner text.
+    // Classic PNG cards have a white face, so the background must be white too.
+    // (CARD_FACE_COLOUR is the Terminal theme's dark face colour — wrong here.)
     parent.spawn((
         AndroidCornerBg,
         Sprite {
-            color: CARD_FACE_COLOUR,
+            color: Color::WHITE,
             custom_size: Some(Vec2::new(bg_w, bg_h)),
             ..default()
         },
@@ -1165,6 +1167,22 @@ fn add_android_corner_label(
     // Large rank+suit text drawn on top of the background. FiraMono must be
     // wired here explicitly — the suit glyphs (U+2660–U+2666) are not in
     // Bevy's built-in font and render as a coloured rectangle without it.
+    //
+    // Classic PNG cards have a white face: red suits stay the same saturated
+    // red, but black suits must use a dark colour (CARD_FACE_COLOUR ≈ #1a1a1a)
+    // rather than the near-white BLACK_SUIT_COLOUR designed for the dark
+    // Terminal theme background.
+    let text_col = if card.suit.is_red() {
+        if color_blind {
+            RED_SUIT_COLOUR_CBM
+        } else if high_contrast {
+            RED_SUIT_COLOUR_HC
+        } else {
+            RED_SUIT_COLOUR
+        }
+    } else {
+        CARD_FACE_COLOUR
+    };
     let label_text = mobile_label_for(card);
     parent.spawn((
         AndroidCornerLabel(label_text.clone()),
@@ -1175,7 +1193,7 @@ fn add_android_corner_label(
             font_size,
             ..default()
         },
-        TextColor(text_colour(card, color_blind, high_contrast)),
+        TextColor(text_col),
         Anchor::TOP_LEFT,
         Transform::from_xyz(
             -card_size.x / 2.0 + inset,

solitaire_engine/src/layout.rs

@@ -96,13 +96,16 @@ const MAX_TABLEAU_CARDS: f32 = 13.0;
 /// below this band so the HUD doesn't bleed into the play surface.
 ///
 /// Desktop: 64 px fits the score/moves/time + mode badge rows.
-/// Android: 80 px gives the same content rows comfortable clearance.
+/// Android: 112 px — the HUD column has 4 flex tiers with 3 inter-tier
-/// (Previously 128 px when action buttons lived in the top band; those are
+/// gaps (4 px each) plus a SPACE_2 = 8 px top offset. With empty tiers
-/// now in the bottom bar so the larger reserve is no longer needed.)
+/// still contributing gap height in Bevy's flex layout, the actual HUD
+/// height can reach ~80 px before the grid starts; 112 px gives ~28 px
+/// of clearance between the HUD bottom and the top card edge, preventing
+/// the overlap seen with the previous 80 px value.
 #[cfg(not(target_os = "android"))]
 pub const HUD_BAND_HEIGHT: f32 = 64.0;
 #[cfg(target_os = "android")]
-pub const HUD_BAND_HEIGHT: f32 = 80.0;
+pub const HUD_BAND_HEIGHT: f32 = 112.0;
 
 /// Table background colour (dark green felt).
 pub const TABLE_COLOUR: [f32; 3] = [0.059, 0.322, 0.196];