feat(settings): add toggle for dialog backdrop blur

[Maskar]

Summary

New setting to enable/disable the backdrop blur effect when dialogs are open. Found in Settings > Behavior.

Motivation

The blur effect can be distracting when monitoring terminal output behind a dialog. This lets users disable it while keeping the dark overlay for focus.

Details

• New dialogBlur boolean in store (persisted, defaults to true)
• CSS split: .dialog-overlay has no blur, .dialog-overlay.dialog-blur adds it
• Dialog.tsx conditionally applies the blur class based on the setting

Test plan

• Default: dialogs blur the background (existing behavior)
• Uncheck setting: dialogs show dark overlay without blur
• Setting persists across restarts

[Maskar]

Also, it helps to see how the themes and font changes reflect on the actual interface.

[johannesjo]

Thank you very much! Lets just make it the default. Not a big fan of adding settings for everything :)

[Maskar]

Simplified — now just removes the blur by default, no setting. Single line change.

[johannesjo]

Thank you!