[Repo Assist] test: add 5 unit tests for OperationComplete and Error message handling (231→236)

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🤖 This PR was created by Repo Assist, an automated AI assistant.

What

Adds 5 unit tests covering the OperationComplete and Error message paths in process_messages, which previously had no dedicated test coverage for single-operation scenarios.

Test	What it verifies
process_messages_operation_complete_single_op_invalidates_cache	detail_cache is evicted when a successful Upgrade completes
process_messages_operation_complete_failure_no_refresh	Failed operation sets "failed" status, clears loading, does not set post_refresh_status
process_messages_operation_complete_success_sets_post_refresh_status	Successful Pin sets post_refresh_status carrying the operation message
process_messages_operation_complete_unpin_invalidates_cache	detail_cache is evicted after Unpin
process_messages_error_clears_loading_and_post_refresh_status	Error handler resets both loading and post_refresh_status (existing test only covered detail_loading + status text)

Why

The only OperationComplete test that existed before was for the BatchUpgrade path (multi-select clearing). The five code paths for single operations (Install / Uninstall / Upgrade / Pin / Unpin) were exercised by the code but not covered by tests — a regression in cache-invalidation or refresh-triggering logic would have gone unnoticed.

Test Status

cargo check --all-targets  → clean
cargo fmt -- --check       → clean
cargo clippy -- -D warnings → clean
cargo test                 → 236 passed (was 231) — 5 new tests

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