[joker-777]

Cherry-pick of upstream PR Nozbe#1977 (jsamelak), unchanged, tests and changelog included.

canEncodeMatcher reported queries containing Q.unsafeSqlExpr, Q.unsafeLokiExpr, or a Q.on nested inside Q.and/Q.or as encodable, so query().observe() threw Illegal clause instead of falling back to the reloading observer. Kenhub observes queries with Q.on.

Note: its changelog line sits in the same spot as the one in the RN 0.88 PR, so whichever merges second needs a trivial conflict resolution in CHANGELOG-Unreleased.md.

[Copilot]

🟢 Approval recommended

No active review issues were identified for the matcher-eligibility fix intended to let unsupported queries fall back to the reloading observer.

No open issues 🎉

What changed in this PR

This PR brings in upstream Nozbe#1977 to reject unsupported query clauses before matcher encoding, allowing observation to fall back to the reloading observer instead of throwing Illegal clause.

Changes:

• Recursively checks where clauses, rejecting unsafe expressions and nested Q.on clauses.
• Adds matcher rejection cases and observation-order regression tests.
• Documents the fix in the unreleased changelog.

File	Description
src/​observation/​test.js	Adds observation-order tests for an unencodable Loki expression, with and without observed columns.
src/​observation/​encodeMatcher/​test.js	Extends unsupported-query cases to unsafe expressions and nested joins.
src/​observation/​encodeMatcher/​canEncode.js	Adds recursive clause validation and expands the rejection message.
CHANGELOG-Unreleased.md	Records the matcher eligibility fix.

_{Review effort: Balanced}

[Copilot]

🟢 Approval recommended

There are no active review issues for the query-observation fallback change.

No open issues 🎉

_{Review effort: Balanced}