enh: copied-tooltip

[Mazi02]

Motivation and Context

Having a "copied" tooltip makes a better and cleaner UI.

Description

Adding a tooltip to confirm that keys or other things got copied.

Steps for Testing

1. login as admin
2. In admin panel, go to token management and create a new token.
3. Click on the URL and or the key and the tooltip should appear.
4. Also as you make a new stream and copy the rtmp URL and key it should appear.

NOTE: after 1.5 seconds it should disappear.

Screenshots

[Copilot]

Pull request overview

This PR improves the web UI by adding a short-lived “Copied” tooltip when users copy stream URLs/keys and generated admin tokens, making copy actions clearer without adding persistent UI elements.

Changes:

• Added Alpine helpers (copyAndShow, copied, copyTimeout) to display a “Copied” tooltip for various copy-to-clipboard actions.
• Updated course lecture management and admin token templates to wrap copy targets with a tooltip container.
• Introduced a shared .copy-tooltip CSS utility (including an arrow pseudo-element) for consistent tooltip styling.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
web/template/partial/course/manage/lecture-management-card.gohtml	Adds tooltip behavior for copying stream server URL and stream key in lecture management.
web/template/admin/admin_tabs/token.gohtml	Adds tooltip behavior for copying the generated token and RTMP details in the admin token flow.
web/assets/css/main.css	Adds the reusable .copy-tooltip styling (positioning, colors, arrow).

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