Peter Baker e0d66b2fd0 Fix ambiguous column in SQLite FTS multi-term search (#2688)
* Fix multi-term SQLite FTS5 search causing a 500 error

When filtering cards by more than one term, `matching` was called
once per term via an association join. Rails did not deduplicate
association joins, resulting in two JOINs to `search_records_fts`
in a single query. SQLite FTS5 then raised "ambiguous column name"
when evaluating the MATCH condition.

Fix by using a string join instead, which Rails deduplicates so
only one JOIN to `search_records_fts` is generated regardless of
how many terms are searched.

Fixes: https://github.com/basecamp/fizzy/discussions/2354

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* test: verify multi-term search requires ALL terms to match

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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: Mike Dalessio <mike@37signals.com>
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Fizzy

This is the source code of Fizzy, the Kanban tracking tool for issues and ideas by 37signals.

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