[Repo Assist] test: add prefer_package and dedupe_packages edge-case tests (231→241)

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What

Adds 10 new unit tests covering two previously under-tested functions in cli_backend.rs, plus a minor consistency fix in handler.rs.

prefer_package — 7 tests

This function decides which of two duplicate package entries to keep during deduplication. Previously it was only exercised indirectly through dedupe_packages. New direct tests cover every branch:

Test	Scenario
prefer_package_newer_version_wins	Candidate has higher semver
prefer_package_older_version_loses	Candidate has lower semver
prefer_package_equal_versions_more_metadata_wins	Tie on version; candidate has source + available
prefer_package_equal_versions_equal_metadata_returns_false	Identical metadata → keep existing
prefer_package_unknown_version_loses_to_real	"unknown" < any real version
prefer_package_real_version_beats_unknown	Real version > "unknown"
prefer_package_equal_versions_one_source_field_wins	Source field alone tips the score

dedupe_packages — 3 tests

The existing test only checked version ordering. New tests cover:

Test	Scenario
dedupe_packages_different_sources_are_kept_separately	Same ID, different sources → both kept
dedupe_packages_keeps_entry_with_most_metadata	Equal versions → entry with available_version wins
dedupe_packages_source_comparison_is_case_insensitive	winget and Winget treated as the same source

handler.rs — consistency fix

The o (open homepage) action used "Opening {}..." (three ASCII dots) while c (open changelog) used "Opening changelog {}..." (Unicode ellipsis ...). Changed the homepage message to also use ... for visual consistency.

Why

• prefer_package contains non-trivial branching logic (version comparison + metadata scoring) that wasn't directly tested. These tests document the contract and catch regressions.
• The dedupe_packages cross-source and metadata-score cases are real production paths exercised when winget list returns the same package from multiple sources.
• The ellipsis inconsistency was a minor cosmetic roughness.

Test Status

cargo check --all-targets  → clean
cargo fmt -- --check       → clean
cargo clippy -- -D warnings → clean
cargo test                 → 241 passed, 0 failed (was 231)

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