feat(Popover): add programmatic close functionality to popover root

[JosephAnson]

🔗 Linked issue

• I've made this PR to help support a change to NuxtUI (feat(Modal/Slideover): add close method in slots nuxt/ui#4219) as it would reduce the amount of internal state needed.
• A similar change was made for the DialogRoot: feat(Dialog): add programmatic close functionality to dialog root #1943

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Implemented programmatic close method for PopoverRoot component.

New Feature:

• Programmatic close method - Popover now exposes a close method through the #default scoped slot, allowing popovers to be closed from within their content without requiring external ref management.

Documentation Updates:

• Shows how to eliminate the need for manual v-model:open ref management.

Benefits:

• No need to create and manage boolean refs for modal state
• Reduces boilerplate code and cognitive load

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/reka-ui@1956

commit: 7c7cdaa