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 Electron

On Linux, the native file browser dialog is not triggered immediately when adding a project in Electron. Instead, Sidebar.tsx now detects Linux via a case-insensitive check on navigator.platform and shows the project path text input instead.

^{Macroscope summarized 387d58a.}

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