Fix advanced search refine/extend combination logic

[level09]

Fixes BYNT-1760.

Multi-block advanced search (Refine/Extend) combined query blocks incorrectly in two ways:

1. OR flattened block conditions. or_(*conditions, *next_conditions) OR-ed every individual condition instead of (block1) OR (block2). A block with "tag X AND access group G" degraded to "tag X OR access group G", inflating results.
2. Chained blocks dropped earlier ones. The or branch read from the first block's condition list instead of the accumulated result, so with three or more blocks intermediate blocks were silently discarded.

Both bulletin and actor paths are fixed with a left-associative fold: each block's conditions are grouped with AND, then combined with the accumulated query using the block's op. Empty blocks are skipped.

Added focused tests compiling the generated SQL for grouping, chained ORs, and AND-after-OR.

Present since the search rewrite in #97, so this affects existing deployments, not just recent branches.

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