Add "Add Bot" button on bot profiles + in-app invite link popup support

[Ariz-z]

Problem

Right now, users can't add a bot directly from its profile inside the app, which causes friction — they have to leave the app entirely and go through a browser flow. Similarly, when a user pastes a bot invite link in chat and taps it, it opens the web browser instead of handling it natively within the app, which causes a broken and slow experience, especially on mobile.

Proposed solution

Add a visible "Add Bot" button directly on bot profile pages inside the Fluxer app, so users can add a bot to their server without ever leaving the app.
Additionally, add in-app invite link interception — when a user pastes or taps a bot invite link inside a chat, it should trigger a native popup/modal (similar to how Discord handles it) that lets the user select a server and authorize the bot directly within the app, instead of redirecting to the web OAuth flow.

Notes (optional)

Notes:

• The "Add Bot" button UX could mirror how Discord's bot profile shows an "Add App" button
• The in-app invite popup should handle the OAuth permission scopes natively
• This would significantly improve the mobile UX for bot discovery and onboarding

Potential files/areas:

• Bot profile component / screen
• Deep link / URL intent handler for invite links
• OAuth/authorization flow — in-app WebView or native modal

Checks

• I searched for existing discussions and didn't find a duplicate.

[notgapriel]

This is a good idea. Even if it just opens the same link, this achieves the same goal as copying the bot's User ID and pasting it into https://web.fluxer.app/oauth2/authorize?client_id=<client ID>&scope=bot&permissions=0 with less friction. Main thing is you'd, as the bot developer, want an option somewhere (perhaps in the application menu) to set what permissions it'd ask for by default.

[CLtheman1-A]

Not only that, but the screen we currently have when choosing where to add the bot to, is buggy and partially unusable on mobile, because if I select another community other than what's already selected by default, the screen turns black and I can't do anything further. So that screen needs to be fixed for mobile users using Firefox-like(or Mozilla-based) browsers(which is what I use).

[kenderbard]

You should probably make an actual bug report for that if you haven't already.