Make fixes and improvements to PCUI's API reference docs

[willeastcott]

This PR improves and corrects the JSDoc API reference documentation across multiple PCUI components.

Bug Fixes

• ArrayInput: Fixed EVENT_LINK_ELEMENT and EVENT_UNLINK_ELEMENT constants that used : instead of = (TypeScript syntax error)
• NumericInput: Fixed incorrect default value for precision in JSDoc (was "2", should be "7")

Documentation Improvements

Event Constants Added

Added properly documented static event constants with @event tags and usage examples to:

• NumericInput: EVENT_CHANGE, EVENT_SLIDER_MOUSEDOWN, EVENT_SLIDER_MOUSEUP
• SelectInput: EVENT_CHANGE, EVENT_FOCUS, EVENT_BLUR
• VectorInput: EVENT_CHANGE, EVENT_FOCUS, EVENT_BLUR

Missing JSDoc Added

• Button: focus(), blur() methods
• Label: value, values, placeholder, renderChanges properties
• InputElement: focus(), blur() methods with parameter documentation
• TextInput: values setter
• NumericInput: value getter/setter, values setter
• ArrayInput: value getter/setter, values setter, renderChanges getter/setter
• VectorInput: focus(), blur() methods, value, values, binding, placeholder, inputs, renderChanges properties
• SelectInput: focus(), blur() methods, options, invalidOptions, disabledValue, disabledOptions, fallbackOrder, multiSelect, value, values, placeholder, renderChanges properties

[Copilot]

Pull request overview

This PR fixes critical TypeScript syntax errors and significantly improves JSDoc API reference documentation across PCUI components by adding missing documentation and correcting inaccurate defaults.

• Fixed TypeScript syntax errors in ArrayInput event constants (using : instead of =)
• Corrected NumericInput precision default documentation from "2" to "7"
• Added comprehensive event constant documentation with usage examples for NumericInput, SelectInput, and VectorInput
• Documented previously undocumented methods and properties across 8 components

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/components/ArrayInput/index.ts	Fixed TypeScript syntax for EVENT_LINK_ELEMENT and EVENT_UNLINK_ELEMENT constants, added JSDoc for value/values/renderChanges properties
src/components/NumericInput/index.ts	Corrected precision default from 2 to 7, added EVENT constants with examples, documented value/values properties
src/components/SelectInput/index.ts	Added EVENT constants with examples, documented focus/blur methods and all property getters/setters
src/components/VectorInput/index.ts	Added EVENT constants with examples, documented focus/blur methods and all properties
src/components/TextInput/index.ts	Added JSDoc for values setter
src/components/Label/index.ts	Added JSDoc for value, values, placeholder, and renderChanges properties
src/components/InputElement/index.ts	Added JSDoc for focus and blur methods with parameter documentation
src/components/Button/index.ts	Added JSDoc for focus and blur methods

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