perf: replace std.debug.assert with inlined version

See doc comment in `quirks.zig` for reasoning

src/font/SharedGrid.zig

@@ -19,7 +19,7 @@
 const SharedGrid = @This();
 
 const std = @import("std");
-const assert = std.debug.assert;
+const assert = @import("../quirks.zig").inlineAssert;
 const Allocator = std.mem.Allocator;
 const renderer = @import("../renderer.zig");
 const font = @import("main.zig");