fix: emcn component library design engineering polish

[adithyaakrishna]

Summary

Comprehensive polish of the emcn compos library along with addressing a11y issues and design token consistency

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation
• Other: Components Polish

Testing

• Visual regression: Button variants (tertiary no longer uses !important, base class restructured), toast auto-dismiss now 5s default, dropdown menu wider
• Touch devices: Verify hover states no longer stick on tap
• Keyboard navigation: Tab through Input, Textarea, Slider, Switch all now show visible focus indicators
• Reduced motion: Toggle prefer reduced motion (macos setting), all animations should be disabled

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

[cursor]

PR Summary

Medium Risk
Medium risk because it introduces new global CSS variables and replaces many hard-coded colors/sizes across auth, landing, blog, and changelog UIs; regressions in contrast/hover states or token availability could impact multiple pages. Minor behavioral tweaks (signup validation reveal animation, marquee pause-on-hover, chat customization default color) could also change user-facing flows.

Overview
Standardizes marketing/auth UI styling around new CSS tokens. Replaces many hard-coded hex colors and pixel-based Tailwind classes across landing, blog, changelog, and auth pages with --landing-* variables and normalized spacing/typography utilities.

Adds shared global design primitives. Introduces a global z-index scale, shadow presets, and theme-aware scrollbar colors in globals.css, and updates branded button CSS variables (--brand*) plus semantic colors (--success, --error, --caution).

Small UX/behavioral polish. Improves signup form validation message presentation (animated expand/collapse), refines enterprise marquee animation to pause on hover, tweaks default chat primaryColor fallback, and removes restrictive viewport scaling settings in apps/docs.

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Project	Deployment	Actions	Updated (UTC)
docs	Skipped		Mar 20, 2026 5:50pm

[icecrasher321]

@adithyaakrishna just ping me when this is ready for review. We'll go through this together.

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

There are 2 total unresolved issues (including 1 from previous review).

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[adithyaakrishna]

@icecrasher321 this is ready