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/examples/card_face_poc.rs

@@ -44,8 +44,8 @@ fn main() {
     // 256×384 = 2:3 aspect at half the default svg_loader resolution.
     // See migration plan § "Output format" for the rationale.
     let target = UVec2::new(256, 384);
-    let image = rasterize_svg(svg.as_bytes(), target)
-        .expect("rasterising the PoC SVG should succeed");
+    let image =
+        rasterize_svg(svg.as_bytes(), target).expect("rasterising the PoC SVG should succeed");
 
     let bytes = image
         .data
@@ -61,11 +61,13 @@ fn main() {
     // bytes from a Pixmap inside `svg_loader`; this round-trip is
     // the cost of going through Bevy's `Image` shape.
     let size = IntSize::from_wh(target.x, target.y).expect("target size is non-zero");
-    let pixmap = Pixmap::from_vec(bytes, size)
-        .expect("RGBA byte buffer should form a valid Pixmap");
+    let pixmap =
+        Pixmap::from_vec(bytes, size).expect("RGBA byte buffer should form a valid Pixmap");
 
     let out = "/tmp/ace_spades_terminal.png";
-    pixmap.save_png(out).expect("writing the PNG should succeed");
+    pixmap
+        .save_png(out)
+        .expect("writing the PNG should succeed");
 
     println!(
         "Wrote {} ({}×{} RGBA8, {} bytes on disk)",