docs: sync Button widget properties and add related cross-links

[amelia-c0n]

Description

• Sync the Button widget reference with the product: add missing Label styles (Font color, Font size, Emphasis), rename Disabled invalid forms to Disable when form is invalid, and fix the Reference properties section heading plus a setVisibility typo.
• Add cross-links from the Form widget to Button Form settings, and from the Google reCAPTCHA guide to Button Validation properties.

Pull request type

• Review Fixes
• Documentation Overhaul
• Feature/Story
  • feat(widgets): add label styling options to button widget appsmith#41998 (fixes [Feature]-[36.235]:Allow users to customise their button text color, font size, and text decoration appsmith#15065)
• A-Force
• Error in documentation
• Maintenance

Documentation tickets

Checklist

• Checked for Grammarly suggestions.
• Adhered to the writing checklist.
• Adhered to the media checklist.
• Verified and updated cross-references or added redirect rules.
• Tested the redirect rules on deploy preview.
• Validated the modifications made to the content on the deploy preview.
• Validated the CSS modifications on different screen sizes.

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Project	Deployment	Actions	Updated (UTC)
appsmith-docs	Ready	Preview	Aug 4, 2026 3:23pm

[CLAassistant]

All committers have signed the CLA.