Closes the 'zero_chunks warning has no row to attach to' gap surfaced by
the 2026-05-14 integration UAT. Before this fix RagService.getStoredFiles
returned only file paths that appeared in Qdrant's payload.source — so
files with 0 embedded chunks (video-only ZIMs, browse_only opt-outs,
ingestions that failed before producing any chunks) silently disappeared
from the KB panel's Stored Files table.
The fix unions the Qdrant scroll result with the disk-backed file paths
recorded in kb_ingest_state. Effect:
- lrnselfreliance_en_all_2025-12.zim (3.97 GB video-only ZIM, 0 chunks)
now appears in the table, picks up its zero_chunks warning chip
- Files in pending_decision under Manual policy show up so the user can
see what's waiting for opt-in
- Files in browse_only / failed states have a row for future per-card
Retry / Re-index actions (forthcoming, blocked on #886)
The state-machine query is wrapped in its own try/catch so a transient
DB error degrades to the Qdrant-only list rather than 500-ing the whole
panel — same defensive posture as the outer try/catch.
Stacks on feat/kb-ingest-state-machine (#888) because the union depends
on the kb_ingest_state table that PR introduces. Will rebase to rc once
#888 merges. Completes the second half of #895's warning surface; the
first half (partial_stall) already worked because those files have at
least some chunks in Qdrant.
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