fix(web): show text input for adding projects on Linux desktop

[eggfriedrice24]

Summary

On Linux/Wayland, the GTK file picker is broken for folder selection in Electron apps, completely blocking adding projects. This shows the web-style text input on Linux desktop instead of immediately opening the native file picker.

Closes #966
Closes #270

Changes

• Skip the immediate file picker open on Linux desktop (isElectron && /linux/i.test(navigator.platform))
• Linux users now see the path text input with an Add button (same UX as web mode)
• Mac/Windows behavior is unchanged

Test plan

• On Linux desktop: clicking "+" shows text input instead of opening file picker
• On Mac/Windows desktop: clicking "+" still opens native file picker immediately
• On web: behavior unchanged
• Typing a path and pressing Enter adds the project

Note

Show text input for adding projects on Linux desktop in Sidebar

On Linux Electron, the native file browser dialog cannot be used to add projects, so the text input path entry is shown instead. Adds isLinuxPlatform to utils.ts and uses it in Sidebar.tsx to set shouldBrowseForProjectImmediately to false on Linux Electron.

^{Macroscope summarized 9757ff5.}

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[eggfriedrice24]

@juliusmarminge sorry for tagging I know you are busy but can you take a look at this? One line change, closes 2 issues and helps linux users, thanks...

[juliusmarminge]

extract Linux matcher to helper. We already have for Windows and Mac

[eggfriedrice24]

Done, thanks!

[eggfriedrice24]

rebased on latest main, ready for another look