* Build radio widget entries from choice type metadata so variants display their icons
* Route the node properties enum radio through the shared choice type entry builder
* Introduce the GradientRamp exchange struct as the serialized TaggedValue::Gradient payload
* Unify FillChoice and FillChoiceUI into one enum generic over color format, carrying GradientRamp stops
* Rename the TaggedValue::Gradient variant to GradientRamp to match its payload
* Move the Color variant into the tagged_value macro list since its stored and wire forms match
Fix missing welcome panel after closing all documents
Closing all documents left the Welcome panel as the only tab, but the old active document index could still point to a tab that no longer existed. The fix is to reset it to 0 when the document list becomes empty.
* Break out VisualColorPickersInput.svelte
* Break out ColorComparisonInput.svelte and ColorPresetsInput.svelte
* Add backend definitions and plumbing for the 4 new widgets
* Port the ColorPicker.svelte layout and business logic to Rust
* Port more ColorComparisonInput.svelte logic to Rust
* Port more SpectrumInput.svelte logic to Rust
* Port more frontend logic to Rust
* Code review
* Code review
* Fix some CSS
* Add interactive panel docking
* Preserve active tab when a panel group is docked
* Add inter-panel gutter hover color
* Code review fixes
* More code review
* Add support for dragging panel tabs docked into other panel tab bars
* Fix terminology
* Add Group suffix to PanelGroupId enums variants
* Code review
* Remove the unused Editor.raw/wasmMemory/wasmImport
* Split out Editor.subscriptions
* Replace editor.handle.* with editor.* (1 of 2)
* Replace editor.handle.* with editor.* (2 of 2)
* Replace Editor typedef with EditorHandle import
* Pluralize subscription-router and rename subscriptionsRef->subscriptionsRouter and editorRef->editorHandle
* Remove editor.ts
* Update the readme
* Fix demo art loading bug
* Replace parameter passing with getContext and extract destroy functions to module-level exports
* Resend layouts from Rust when editor is re-mounted on HMR
* Code review
* Clean up component setup/tear-down side effects
* Clean up more component setup/tear-down side effects
* Remove nonfunctional debouncer
* Clean up even more component setup/tear-down side effects
* Reuse backend state
* Fix HMR for IO Managers and for State Providers
* Rename IO Managers -> Managers and State Providers -> Stores
* Restructure and partially flatten managers/stores
* Code review fixes
* Review fixes
