[Repo Assist] test: add 6 unit tests for sort-desc, UnpinnedOnly filter, and version edge cases (231→237)

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What

Adds 6 new unit tests in src/app.rs covering previously untested branches in apply_filter and compare_versions. Test count grows from 231 → 237.

New tests

Test	What it covers
apply_filter_sort_by_id_desc	Descending ID sort: Z.App → M.App → A.App
apply_filter_sort_by_version_desc	Descending version sort respects numeric ordering: 10.0 > 2.0 > 1.9
apply_filter_unpinned_only_excludes_pinned	PinFilter::UnpinnedOnly removes Blocking-pinned packages
compare_versions_prerelease_beats_older_minor	2.0-beta > 1.9 despite the -beta text suffix on the leading segment
compare_versions_build_metadata_separator	+ is treated as a separator: 1.0+20240101 > 1.0+20230101
local_filter_returns_empty_when_no_match	Filter with no matches yields empty list; selection is clamped to 0

Why

The existing sort tests only covered ascending direction. Descending sort, the UnpinnedOnly pin-filter branch, and version-parsing edge cases (- prerelease and + build-metadata separators) were all untested. These gaps mean a regression in any of these code paths would not be caught by CI.

Test Status

cargo check --all-targets  → clean
cargo fmt -- --check       → clean
cargo clippy -- -D warnings → clean
cargo test                 → 237 passed (was 231) — 6 new tests

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