fix: update imports to use import type for verbatimModuleSyntax compa…

[Om-singh-ui]

Fixes #8499

Changes Made

• ✅ Updated all type-only imports in apps/www/registry/**/ui/** to use import type
• ✅ Updated all type-only imports in apps/v4/app/examples/playground/components/** to use import type
• ✅ Maintained proper separation between type and value imports as required by verbatim module syntax
• ✅ No runtime behavior changes - purely TypeScript import syntax improvements

Benefits

• Improved Compatibility: Enables usage with strict TypeScript configurations
• Cleaner Imports: Explicit separation between type and value imports
• Better Build Performance: Helps bundlers and compilers optimize more effectively
• Future-Proof: Aligns with TypeScript's direction for module syntax

Verification

• ✅ pnpm build:registry runs successfully without errors
• ✅ All components build and render correctly
• ✅ No runtime behavior changes detected
• ✅ TypeScript compilation passes with verbatimModuleSyntax: true enabled

Testing

Steps to Verify:

1. Enable "verbatimModuleSyntax": true in tsconfig.json
2. Run pnpm build:registry (or build the www workspace)
3. Observe no build errors
4. Verify all components render correctly in the playground

Before:

import { SliderProps, ButtonProps } from "@/components/ui/slider";
// TS1487 Error with verbatimModuleSyntax

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[Om-singh-ui]

@shadcn-team Could you please review this PR? It fixes #8499 by updating type-only imports to use import type.