style: Apply cargo fmt and clippy fixes across codebase

Automated formatting and lint corrections from parallel agent work:

- cargo fmt: import reordering (alphabetical), line wrapping to respect
  max width, trailing comma normalization, destructuring alignment,
  function signature reformatting, match arm formatting
- clippy (pedantic): Range::contains() instead of manual comparisons,
  i64::from() instead of `as i64` casts, .clamp() instead of
  .max().min() chains, let-chain refactors (if-let with &&),
  #[allow(clippy::too_many_arguments)] and
  #[allow(clippy::field_reassign_with_default)] where warranted
- Removed trailing blank lines and extra whitespace

No behavioral changes. All existing tests pass unmodified.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/cli/commands/show.rs

@@ -154,10 +154,7 @@ fn find_issue(conn: &Connection, iid: i64, project_filter: Option<&str>) -> Resu
                  FROM issues i
                  JOIN projects p ON i.project_id = p.id
                  WHERE i.iid = ? AND i.project_id = ?",
-                vec![
-                    Box::new(iid),
-                    Box::new(project_id),
-                ],
+                vec![Box::new(iid), Box::new(project_id)],
             )
         }
         None => (
@@ -346,10 +343,7 @@ fn find_mr(conn: &Connection, iid: i64, project_filter: Option<&str>) -> Result<
                  FROM merge_requests m
                  JOIN projects p ON m.project_id = p.id
                  WHERE m.iid = ? AND m.project_id = ?",
-                vec![
-                    Box::new(iid),
-                    Box::new(project_id),
-                ],
+                vec![Box::new(iid), Box::new(project_id)],
             )
         }
         None => (