fix: clippy lints — sort_by_key in drift, pub visibility for TUI, assert formatting

- drift.rs: Replace `sorted.sort_by(|a, b| b.1.cmp(&a.1))` with idiomatic
  `sort_by_key(|entry| std::cmp::Reverse(entry.1))` (clippy::use_sort_by_key).

- list.rs: Change `query_issues` and `query_mrs` from `fn` to `pub fn` so the
  TUI crate can call them directly instead of duplicating the query logic.

- vector.rs: Reformat multi-line assert! macro to satisfy rustfmt check
  (body moved onto separate lines with trailing message string).

src/cli/commands/drift.rs

@@ -382,7 +382,7 @@ fn extract_drift_topics(description: &str, notes: &[NoteRow], drift_idx: usize)
     }
 
     let mut sorted: Vec<(String, usize)> = freq.into_iter().collect();
-    sorted.sort_by(|a, b| b.1.cmp(&a.1));
+    sorted.sort_by_key(|entry| std::cmp::Reverse(entry.1));
 
     sorted
         .into_iter()

src/cli/commands/list.rs

@@ -253,7 +253,7 @@ fn query_available_statuses(conn: &Connection) -> Result<Vec<String>> {
     Ok(statuses)
 }
 
-fn query_issues(conn: &Connection, filters: &ListFilters) -> Result<ListResult> {
+pub fn query_issues(conn: &Connection, filters: &ListFilters) -> Result<ListResult> {
     let mut where_clauses = Vec::new();
     let mut params: Vec<Box<dyn rusqlite::ToSql>> = Vec::new();
 
@@ -450,7 +450,7 @@ pub fn run_list_mrs(config: &Config, filters: MrListFilters) -> Result<MrListRes
     Ok(result)
 }
 
-fn query_mrs(conn: &Connection, filters: &MrListFilters) -> Result<MrListResult> {
+pub fn query_mrs(conn: &Connection, filters: &MrListFilters) -> Result<MrListResult> {
     let mut where_clauses = Vec::new();
     let mut params: Vec<Box<dyn rusqlite::ToSql>> = Vec::new();