feat(viz): bit manipulation types

frontend/src/lib/visualizations/types.ts

@@ -99,6 +99,8 @@ export interface DataState {
   tries?: TrieState[];
   // Union-Find support
   unionFind?: UnionFindState[];
+  // Bit Manipulation support
+  bitManipulation?: BitManipulationState[];
 }
 
 /** Single step in the visualization */
@@ -382,6 +384,28 @@ export interface TrieState {
   searchIndex?: number;    // Current character index
 }
 
+// ============================================
+// Bit Manipulation Types
+// ============================================
+
+/** State of a bit representation display */
+export interface BitState {
+  id: string;
+  value: number;
+  bits: string;  // Binary string like "0010"
+  label?: string;
+  state: 'normal' | 'highlighted' | 'comparing' | 'result' | 'cancelled';
+}
+
+/** Complete bit manipulation state */
+export interface BitManipulationState {
+  id: string;
+  operands: BitState[];
+  operation?: 'XOR' | 'AND' | 'OR' | 'NOT';
+  result?: BitState;
+  label?: string;
+}
+
 // ============================================
 // Union-Find Types
 // ============================================