Josh 0ce6c6a561 Strengthen Rust tests for #209/#210: call production code instead of re-implementing parsing
- Extract compute_capture_range() in copy_mode.rs as shared utility
- test_issue209: replace display-message re-implementation with execute_command_string() calls, add show-options popup test, flag combo tests (22->25 tests)
- test_issue210_captures: replace arithmetic formula tests with compute_capture_range() calls, add edge cases (11->12 tests)
- test_issue210_fixes: replace eval_session_filter() helper with expand_format() production calls (34->30 tests)
- Label all server-side contract tests with production code file/line refs
- All 999+ tests pass with 0 failures
2026-04-14 12:47:15 +05:30
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