**Add robust error handling to `link_frames` macro using `syn::LitStr` and `compile_error!`**

[S0raWasTaken]

141-170: Add robust error handling to link_frames macro using syn::LitStr and compile_error!
link_frames uses multiple unwrap() calls without input validation, producing opaque proc macro panicked errors when:

• No argument is provided
• The argument isn't a string literal
• File I/O, tar, or zstd operations fail

Replace the current token parsing with syn::LitStr parsing and emit compile_error! with clear diagnostics instead. This requires adding syn to Cargo.toml dependencies. Use parse_macro_input! to convert parse failures to compiler diagnostics automatically, and Error::new_spanned() for runtime failures like missing or invalid files.

This would do good as a new issue for a later PR.

Originally posted by @S0raWasTaken in #33 (comment)