Fix: restore all saved boards when editing an InvokeAI board album

[lstein]

Bug

When editing a previously-saved InvokeAI board-backed album, the board checklist showed only "Uncategorized" checked, even though more boards (or all of them) had been selected and indexed successfully.

Root cause

populateBoardAlbumEditForm (album-manager.js) renders a placeholder checklist immediately — but with board names still unresolved, that render only paints the prepended "Uncategorized" box. It then kicks off the async loadBoards() to fetch the real list. The trouble was how loadBoards chose which boxes to check:

selectedIds: collectSelectedBoardIds(boardsContainer).length
  ? collectSelectedBoardIds(boardsContainer)   // reads the DOM → just ["none"]
  : album.invokeai_board_ids || [],            // the real saved list (skipped!)

When the saved selection included Uncategorized (none), the placeholder render left that box checked, so collectSelectedBoardIds() returned ["none"] (truthy) and the full album.invokeai_board_ids was never used. Every other saved board came back unchecked. (The bug only bit when none was among the saved boards — otherwise the DOM scrape returned [] and the fallback kicked in.)

Fix

loadBoards now takes an explicit preferredIds:

• The initial auto-load passes album.invokeai_board_ids directly — no DOM scrape.
• The manual "Connect & Load Boards" button passes the current in-DOM selection, so an in-progress edit isn't clobbered on reconnect.

Testing

• New regression test reproduces the exact scenario (all boards incl. Uncategorized) — verified it fails without the fix, passes with it.
• Added a test that manual reconnect preserves the user's in-progress selection.
• npm test (381 tests), npm run lint, npm run format:check all clean.

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