* Migrate Specta to Tsify to auto-generate messages.ts, working except colors and widgets
* Adopt the generated FillColor/Color/GradientStops
* Fix widget typing
* Separate WidgetGroup enum variants into wrapper structs
* Small rename
* Simplify widgets further
* Clean up message type references
* Switch type imports to the auto-generated file
* Remove lowercase serde rename
* Fix FillChoice deserialization
* Fix small regression from #3837
* Improve type safety
* Make WidgetSpan type-safe
* More cleanup and type safety
* More type safety
* More type safety
* Get the rest to type-check without errors; improve widget builder macro to have optional icons; improve Svelte 5 configs
* Cargo fmt
* Fix imports
* Update outdated readme info
* Fix lint command rename references
* Fix typos
* One more typos fix
* Remove unnecessary dep: prefix from the edited Cargo.toml files
* Remove excess parts from Cargo.toml
* Fix compiling on desktop
* Revert "Remove excess parts from Cargo.toml"
This reverts commit 6b711117b3a5d5d8a3ee20f36a43bc74930b7c82.
* Update dev docs with simpler, more accurate instructions
Keavon Chambers