Make link preview optional

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Is your feature request related to a problem? Please describe.

Always-on link preview can lead to privacy and usability issues, depending on the user and context.

Examples:

• Privacy: Merely sending a link causes the link to be accessed, leaking information to the server hosting the link.
• Usability: Pages behind authentication will show the login page in the preview.

Describe the solution you'd like

I'd like to have the option to turn off link preview, either globally, per conversation or per device.

Describe alternatives you've considered

Only infeasible alternatives:

• Not sending links.
• Removing the https:// part of the link before sending.
• Switching to another messaging tool.

Thank you for developing spreed!

The issue names no files, tests, or entry points. Start by locating the existing link-preview handling in the Talk codebase and determine whether the setting should apply globally, per conversation, or per device; done means users can disable previews at the supported scope without sending the link for preview access.