Add DC-bias C_eff stima to derating and INFO when bulk C has no HF ceramic.

Keep both as labelled estimates: no Murata lot curve and no invented Z(f) target without f_sw.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/lib/types.ts

@@ -305,6 +305,12 @@ export interface DeratingRow {
   net_plus: string | null;
   net_minus: string | null;
   dielectric_category: "ceramic" | "tantalum" | "electrolytic" | null;
+  dielectric?: string | null;
+  c_nominal_f?: number | null;
+  dc_bias_factor?: number | null;
+  c_eff_f?: number | null;
+  c_eff_formatted?: string | null;
+  dc_bias_model?: "stima" | null;
 }
 
 export interface DeratingSettings {