File copy UI

[jamiepine]

Closes #(issue)

[cursor]

PR Summary

Adds a file copy/move modal with drag-and-drop and sidebar reordering, introduces ephemeral watcher/job handling and globally deterministic content UUIDs, and improves copy conflict handling and event filtering.

• UI:
  • File operations: New modal for copy/move with conflict resolution (overwrite/rename/skip) and progress; drag-and-drop from explorer to locations/groups/folders; multi-file drag; sounds for actions.
  • Spaces sidebar: Reorder groups/items (sortable), insert at space/group, new Devices/Tags groups wiring.
  • Explorer: Grid virtualization, improved Column/List navigation/selection, folder drop targets, refined DnD previews.
• File Copy Backend:
  • Adds Skip resolution and per-file rename/skip/overwrite handling; smarter destination path resolution; FastCopy delegates directories; options plumbed through actions/jobs.
• Jobs:
  • Introduces DynJob::should_persist and ephemeral jobs that skip DB/event emission; manager logs/behavior updated accordingly.
• Watcher/Events:
  • Context includes location_watcher; ephemeral indexing auto-registers shallow watches; metrics track ephemeral watches; skip locations with IndexMode::None.
  • Event filtering checks alternate_paths; platform handlers process ephemeral paths; tests cover ephemeral watcher flow.
• Indexing/Content:
  • ContentIdentity UUIDs now globally deterministic from content_hash only; storage/linking updated; docs revised.
• Libraries/Spaces:
  • Create default Devices and Tags space groups; adjust group order; API accepts optional group_id for item reordering.
• SDK/Docs/Infra:
  • TS types for new enums/queries (core.ephemeral_status, FileConflictResolution::Skip); indexing docs expanded; Tailwind/font tweaks; minor package/config updates.

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