Feature request: Custom URI schemes (e.g., `obsidian://`) are not clickable in Wire

[StephanGeorg]

Description:
When pasting links with custom URI schemes (e.g., obsidian://open?vault=MyVault&file=Projects%2F2026%2FQ2%2FRoadmap) into Wire chat, they are not rendered as clickable links. This prevents users from directly opening applications that use custom URI schemes, such as Obsidian, from Wire.

Steps to Reproduce:

1. Copy a link with a custom URI scheme (e.g., obsidian://open?vault=MyVault&file=Projects%2F2026%2FQ2%2FRoadmap).
2. Paste it into a Wire chat (iOS, Android, or Desktop).
3. Observe that the link is not clickable.

Expected Behavior:
The link should be clickable and open the associated application (if installed) or prompt the user to handle it appropriately.

Actual Behavior:
The link appears as plain text and is not interactive.

Additional Context:

• Custom URI schemes are widely used by applications (e.g., Obsidian, Notion, Slack) to enable deep linking.
• Obsidian URI scheme is documented here as an example.
• This affects both wire-ios and wire-desktop repositories.
• Standard URI schemes (e.g., http://, mailto:) work as expected in Wire.

Possible Solution:
Wire should recognize and handle custom URI schemes (e.g., obsidian://, notion://, etc.) as clickable links, similar to how it handles standard URI schemes.