- Remove rustc_version build dependency that was no longer needed - Remove nightly detection since nightly cfg flag wasn't used anywhere - Simplify build.rs to only set track_caller cfg flag
- Fixed compilation errors in no-std mode (TestError Debug derive, ToString imports) - Addressed consistency issues: Option qualification, StdError naming, Borrow impl - Fixed feature flag logic for supports_color function with proper priority ordering - Added conditional compilation for std-dependent features in panic.rs, handler.rs, theme.rs - Made syntect-highlighter feature explicitly require std - Consolidated duplicate Borrow implementations using core::borrow::Borrow
This commit finishes full no_std support to miette.