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/assets/svg_loader.rs

@@ -248,8 +248,7 @@ mod tests {
 
     #[test]
     fn rasterizes_svg_with_unmatched_font_family() {
-        let image =
-            rasterize_svg(TEST_SVG_WITH_TEXT, UVec2::new(64, 96)).expect("rasterisation");
+        let image = rasterize_svg(TEST_SVG_WITH_TEXT, UVec2::new(64, 96)).expect("rasterisation");
         assert_eq!(image.size().x, 64);
         assert_eq!(image.size().y, 96);
     }
@@ -262,9 +261,11 @@ mod tests {
 
     #[test]
     fn pixmap_data_is_rgba_with_target_byte_count() {
-        let image =
-            rasterize_svg(TEST_SVG, UVec2::new(32, 48)).expect("rasterisation");
-        let pixels = image.data.as_ref().expect("rasterised image carries pixel data");
+        let image = rasterize_svg(TEST_SVG, UVec2::new(32, 48)).expect("rasterisation");
+        let pixels = image
+            .data
+            .as_ref()
+            .expect("rasterised image carries pixel data");
         // 32 × 48 × 4 (RGBA bytes) = 6144 bytes
         assert_eq!(pixels.len(), 32 * 48 * 4);
     }