Feat: implemented Share Modal UI for improved UX

[LaveUI]

Problem
Currently, clicking the "Share" button in the template playground silently copies a very long URL to the clipboard. While functional, it lacks a standard, accessible UI for users to see the link or share it easily to other platforms.
Solution
This PR introduces a dedicated [ShareModal] component that triggers when a user clicks "Share".

• Better UX: Displays the generated URL in a read-only input.
• Clear Feedback: The "Copy Link" button provides clear, immediate feedback (Copied!).
• Social Sharing: Added quick links to share the template to Twitter/X, LinkedIn, or via Email.
• State Management: Integrated the modal's visibility into the global useAppStore for easy access across the app.
• Aesthetic Alignment: Matches the project's existing dark-mode design system and Tailwind typography.
  Testing
• Added unit tests for the new [ShareModal] UI component.
• Updated existing [PlaygroundSidebar] tests to reflect the new state-driven behavior instead of direct clipboard copying.
• Manually verified UI consistency in both Light and Dark themes.

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[mttrbrts]

Thanks for the PR @LaveUI, can you remove the social sharing?

[Copilot]

Pull request overview

Adds a dedicated Share modal workflow to the Template Playground so users can view/copy the generated share URL and access quick social-share actions, instead of silently copying a long link on click.

Changes:

• Introduces a new ShareModal component and renders it from PlaygroundSidebar.
• Updates Share triggers (PlaygroundSidebar, UseShare) to open the modal via Zustand state (isShareModalOpen).
• Updates existing unit/e2e tests to reflect the modal-based share flow.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/tests/components/PlaygroundSidebar.test.tsx	Mocks and asserts presence of the new Share modal in the sidebar test setup.
src/store/store.ts	Adds global Zustand state to control Share modal visibility.
src/components/UseShare.tsx	Replaces direct clipboard-copy behavior with opening the Share modal.
src/components/ShareModal.tsx	New modal UI for share URL display/copy and social-share actions.
src/components/PlaygroundSidebar.tsx	Wires “Share” nav item to open the Share modal and renders the modal.
e2e/share.spec.ts	Updates Playwright flows to copy from within the modal and validate the shared URL.

[LaveUI]

Sure @mttrbrts , I'll remove the social sharing options and keep it limited to generating and copying the sharable link