feat: unified terminal + session system

[itzzjustmateo]

What

I implemented a multi "session" system with a "New Terminal" modal asking you to either choose Powershell 5, Command Prompt, Git Bash, Default Shell, WSL (Windows Only) or SSH (with the ability to save them). I also implemented a media preview if you need to look at e.g. your favicon.ico in some project. I also remade some parts of the general settings to be more user-friendly, like adding a reset button, or making it fit the UI of the Shortcuts section. I also integrated the ACP

Why

This will close 4 issues:

1. My own, Multi-Type "Sessions" #268
2. My own, Add Middleclick Terminal Closer #267
3. And another one, similar to mine, Add Bash, WSL, and Multi-Terminal Support for Windows in Terax-AI Terminal #224
4. Another one, Feature Request: Show remote directory tree when connected via SSH #235
5. Another one, Claude Code support via ACP #289

How

The multi sessions are implemented through a simple modal, this can be skipped using Ctrl + Click.

Testing

I ran the test server using pnpm tauri dev and verified everything is working by going through it manually

• pnpm exec tsc --noEmit clean
• Manual smoke-test of the affected feature
• (If you touched src-tauri/) cargo check clean
• (If UI) tested in pnpm tauri dev

Screenshots / GIFs

Notes for reviewer

Provided Nothing

[itzzjustmateo]

I am now making some fixes to the sidebar

[itzzjustmateo]

btw. the modal did not replace the little dropdown, it just opens when you click "Terminal" in the little dropdown

[itzzjustmateo]

This still needs some work as there are some errors

[itzzjustmateo]

Currently implementing ACP

[itzzjustmateo]

This took way too long xD
BUT I am finished

[felipesja]

Nice. I really need gitbash. :)