fix(appthemes): take Obsidian vaults from its registry, not a directory scanHEADmaster

The installer found vaults by scanning ~/Documents/Obsidian for .obsidian
directories, which cannot tell a vault from a leftover. That parent folder
holds an abandoned .obsidian from a vault that no longer exists, so the scan
found six vaults where Obsidian knows five, and the extra one got a snippet
and an edited appearance.json for something Obsidian never opens.

It now reads ~/.config/obsidian/obsidian.json, which is the list Obsidian
itself maintains, and only writes to a path that is both registered and still
has a .obsidian directory.

The stray directory has been restored to its previous contents.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015gbjA2bmswN8jyPDKzrvqe

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