Follow up to #1815
- Improved detection / responsiveness to unavailable browser
- Disable Save buttons when browser disconnected / unavailable
- Only add unload handler when browser is available
- Consistency between new and edit views: new profile view also has
cancel button with confirmation
- Don't show cancel confirmation if browser is already unavailable.
Various text tweaks for consistency / accuracy:
- Save New Profile... to indicate new profile will be saved after dialog
- Load new browser to indicate new browser will be created
- Mention connection to browser is lost in disconnected message.
Also: migrated to LiteElement -> TailwindElement for browser-profiles-new
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Co-authored-by: emma <hi@emma.cafe>
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