fix: centralize denormalized property resolution with from/to awareness

[genezhang]

Summary

• Enhanced resolve_denormalized_property_in_expr() in plan_builder_utils.rs to handle both table alias rewriting AND property name mapping, replacing the alias-only approach from PR fix: denormalized node alias rewriting in WITH CTE body #224
• From/to distinction: a.city → r.OriginCityName (from_node) vs b.city → r.DestCityName (to_node) now correctly resolved using get_properties_with_table_alias() which is aware of the node's position in the relationship
• Cross-side correction: When rewrite_expression_with_property_mapping maps a property to the wrong side's DB column (e.g., b.city → OriginCityName), the function reverse-lookups through the node schema's from_properties/to_properties to find the original Cypher property name, then resolves it through the correct side's denormalized mapping
• Also handles CASE expressions, coupled schema aliases, and recursive descent through all expression types
• Removed 6 xfail markers from now-passing tests (3 denormalized + 3 coupled schema WITH aggregation tests)

Test plan

• All 1,588 Rust unit tests pass
• Pattern schema matrix: 0 xpassed (clean), 110 passed, 78 xfailed
• Pattern matrix: 0 xpassed (clean), 141 passed, 54 xfailed
• Schema variations comprehensive: 77 passed, 4 xfailed (unchanged)
• Social benchmark WITH aggregation queries work correctly (no regression)
• Total 9 tests promoted from xfail to passing (3 from PR fix: denormalized node alias rewriting in WITH CTE body #224 + 6 here)

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