fix: satisfy clippy 1.97 lints failing on CI

- sanitize_current_ratio: and_then if/else -> filter
- screener/graph sorts: sort_by with reversed cmp -> sort_by_key(Reverse)
- insert_ksei_holdings_rows: manual Result match -> ?

Fixes the Clippy step on ubuntu-latest (rust 1.97) that the nix
toolchain (1.93.1) did not flag.

src/api/msn/map.rs

@@ -184,13 +184,7 @@ fn normalize_percentish(value: Option<f64>) -> Option<f64> {
 }
 
 fn sanitize_current_ratio(value: Option<f64>) -> Option<f64> {
-    value.and_then(|number| {
-        if !number.is_finite() || number < 0.01 {
-            None
-        } else {
-            Some(number)
-        }
-    })
+    value.filter(|number| number.is_finite() && *number >= 0.01)
 }
 
 fn round_price(value: f64) -> i64 {