Open in Obsidian, Actually — Vault Detection and a Cleaner Deal Header
The 'Open in Obsidian' button was silently doing nothing. Turns out `open -a Obsidian /some/folder` is a no-op unless that folder *is* a vault — so we taught the app to walk up to the nearest `.obsidian/` and route through `obsidian://` URIs instead. While we were in there, the deal-workspace header that hosted that button got a long-overdue redesign.