fix(assets,theme): remove assert in svg_loader, log theme failures, fix default theme id (#58, #63, #64)

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

solitaire_engine/src/assets/svg_loader.rs

@@ -24,6 +24,7 @@ use std::sync::{Arc, OnceLock};
 use bevy::asset::io::Reader;
 use bevy::asset::{AssetLoader, LoadContext, RenderAssetUsages};
 use bevy::image::Image;
+use bevy::log::warn;
 use bevy::math::UVec2;
 use bevy::reflect::TypePath;
 use bevy::render::render_resource::{Extent3d, TextureDimension, TextureFormat};
@@ -156,7 +157,7 @@ pub fn rasterize_svg(svg_bytes: &[u8], target: UVec2) -> Result<Image, SvgLoader
 /// share the same canonical face.
 const BUNDLED_FONT_BYTES: &[u8] = include_bytes!("../../../assets/fonts/main.ttf");
 
-/// Returns a process-wide font database holding only the bundled
+/// Returns a process-wide font database that tries to load the bundled
 /// FiraMono-Medium face. Initialised lazily on first SVG that references
 /// text, then shared (via `Arc`) across every subsequent rasterisation.
 ///
@@ -165,17 +166,19 @@ const BUNDLED_FONT_BYTES: &[u8] = include_bytes!("../../../assets/fonts/main.ttf
 /// such request directly to FiraMono so rasterisation is deterministic
 /// across machines and the system font path is never consulted.
 ///
-/// Aborts the program if the embedded bytes don't parse — bundled at
-/// compile time, so a parse failure means the binary is corrupt.
+/// If the embedded bytes fail to yield any faces, log a warning and
+/// fall back to an empty database so startup can continue.
 fn shared_fontdb() -> Arc<fontdb::Database> {
     static DB: OnceLock<Arc<fontdb::Database>> = OnceLock::new();
     DB.get_or_init(|| {
         let mut db = fontdb::Database::new();
-        db.load_font_data(BUNDLED_FONT_BYTES.to_vec());
-        assert!(
-            db.faces().next().is_some(),
-            "bundled FiraMono failed to parse — binary is corrupt"
-        );
+        let loaded_faces = db.load_font_source(fontdb::Source::Binary(Arc::new(
+            BUNDLED_FONT_BYTES.to_vec(),
+        )));
+        if loaded_faces.is_empty() {
+            let e = "no faces loaded from bundled bytes";
+            warn!("Failed to load bundled FiraMono font: {e}");
+        }
         Arc::new(db)
     })
     .clone()