fix(engine,server): safe area clamp, analytics batch, achievement save order, daily rollover, replay validation, leaderboard opt-in (#56, #60, #61, #62, #66, #68)

- #66: Clamp safe-area insets to 25% of window height with warn!() on excess
- #68: Move fire_flush outside per-event loop in analytics (batch flush once)
- #56: Persist progress before marking reward_granted to prevent XP loss on crash
- #60: Add DateRolloverTimer + check_date_rollover system for midnight seed refresh
- #62: Add validate_header() in replay upload with mode/draw_mode allowlists
- #61: Restore two-query leaderboard opt-in check (SELECT then UPDATE); original
       queries already in .sqlx cache; EXISTS variant would require sqlx prepare

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

solitaire_engine/src/layout.rs

@@ -183,7 +183,12 @@ pub struct Layout {
 /// - Top row (stock, waste, 4 foundations) aligns with tableau columns
 ///   0, 1, 3, 4, 5, 6 — column 2 is intentionally empty to separate the
 ///   waste/stock cluster from the foundations.
-pub fn compute_layout(window: Vec2, safe_area_top: f32, safe_area_bottom: f32, hud_visible: bool) -> Layout {
+pub fn compute_layout(
+    window: Vec2,
+    safe_area_top: f32,
+    safe_area_bottom: f32,
+    hud_visible: bool,
+) -> Layout {
     let window = window.max(MIN_WINDOW);
     let band_h = if hud_visible { HUD_BAND_HEIGHT } else { 0.0 };
 
@@ -213,7 +218,8 @@ pub fn compute_layout(window: Vec2, safe_area_top: f32, safe_area_bottom: f32, h
 
     let fan_factor = 1.0 + (MAX_TABLEAU_CARDS - 1.0) * TABLEAU_FAN_FRAC;
     let height_denom = 0.5 + (1.0 + fan_factor + VERTICAL_GAP_FRAC) * CARD_ASPECT;
-    let card_width_height_based = (window.y - safe_area_top - effective_safe_bottom - band_h).max(0.0) / height_denom;
+    let card_width_height_based =
+        (window.y - safe_area_top - effective_safe_bottom - band_h).max(0.0) / height_denom;
 
     let card_width = card_width_width_based.min(card_width_height_based);
     let card_height = card_width * CARD_ASPECT;
@@ -262,7 +268,8 @@ pub fn compute_layout(window: Vec2, safe_area_top: f32, safe_area_bottom: f32, h
     //
     // avail = distance from the top of the first tableau card to the bottom
     //         margin — i.e. the space available for 12 fan steps.
-    let avail = (tableau_y - (-window.y / 2.0 + effective_safe_bottom + h_gap) - card_height / 2.0).max(0.0);
+    let avail = (tableau_y - (-window.y / 2.0 + effective_safe_bottom + h_gap) - card_height / 2.0)
+        .max(0.0);
     let ideal_fan_frac = if card_height > 0.0 {
         avail / ((MAX_TABLEAU_CARDS - 1.0) * card_height)
     } else {
@@ -298,7 +305,9 @@ mod tests {
         assert!(layout.pile_positions.contains_key(&PileType::Waste));
         for slot in 0..4_u8 {
             assert!(
-                layout.pile_positions.contains_key(&PileType::Foundation(slot)),
+                layout
+                    .pile_positions
+                    .contains_key(&PileType::Foundation(slot)),
                 "missing foundation slot {slot}",
             );
         }