[Repo Assist] test: add coverage for ARP/MSIX local stubs and detail-cache invalidation

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What

Adds 7 targeted unit tests to src/app.rs that cover two previously untested code paths:

load_detail — local stub creation (4 tests)

load_detail has a branch for IDs that cannot be looked up via winget show --exact: ARP registry entries (ARP\...), MSIX/AppX packages (MSIX\...), and packages with no source. For these, it builds a local detail stub and caches it without calling the backend. None of this was tested.

Test	Branch covered
load_detail_arp_id_creates_local_stub_without_backend_call	ARP prefix → stub, no backend call
load_detail_msix_id_creates_local_stub_without_backend_call	MSIX prefix → stub, no backend call
load_detail_empty_source_creates_local_stub_without_backend_call	empty source → stub, source = "local"
load_detail_local_stub_is_cached	stub is inserted into detail_cache

process_messages — OperationComplete cache invalidation (3 tests)

When an operation (Install / Upgrade / Uninstall / Pin / Unpin) completes, process_messages removes the affected package from detail_cache so the next selection forces a fresh winget show. Only the BatchUpgrade path was previously tested.

Test	Branch covered
operation_complete_upgrade_invalidates_detail_cache	Upgrade removes entry from cache
operation_complete_pin_invalidates_detail_cache	Pin removes entry from cache
operation_complete_failed_single_op_sets_status_and_does_not_refresh	failed op sets error status; no post_refresh_status queued

Test Status

cargo check --all-targets  → clean
cargo fmt -- --check       → clean
cargo clippy -- -D warnings → clean
cargo test                 → 238 passed (was 231) — 7 new tests

No production code changed.

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