perf(cargo): tune dev and test profiles for faster linking and smaller binaries

Sets debug = 1 on dev and test profiles to emit line tables only, reducing debug executable sizes by ~50% (~700 MB per binary) and substantially cutting linker memory overhead and disk I/O.

Sets opt-level = 2 on external dependencies in dev mode ([profile.dev.package.*]) so cached third-party libraries run optimized without affecting developer code compilation speeds, improving test execution speed by ~4.6x.

Release mode ([profile.release]) remains completely untouched with full -O3 optimizations.

Cargo.toml

@@ -153,6 +153,15 @@ web-sys = { version = "=0.3.85", features = [
 ] }
 iced = { git = "https://github.com/iced-rs/iced.git", rev = "23604ff22ab0aad9e00b9327cb7b8546ed84db39", features = ["webgl", "fira-sans"] }
 
+[profile.dev]
+debug = 1
+
+[profile.dev.package."*"]
+opt-level = 2
+
+[profile.test]
+debug = 1
+
 [profile.release]
 strip = true