🤖 Remove unused stats.calculate IPC method

The stats.calculate endpoint is no longer used. Commit 221e81e moved consumer
calculation to the frontend using pure functions (consumerCalculator.ts) with
backend tokenization via tokens.countBulk.

Removed:
- STATS_CALCULATE IPC handler (~20 lines)
- STATS_CALCULATE constant
- stats.calculate from preload API
- stats interface from IPCApi type
- statsCalculate.test.ts (125 lines testing dead code)

Impact:
- Simpler IPC surface (one tokenization endpoint vs two)
- -150 LoC removed
- All 528 tests still pass
- No functionality lost (calculation moved to frontend)

Author: ammar-agent

src/constants/ipc-constants.ts

@@ -38,9 +38,6 @@ export const IPC_CHANNELS = {
   // Window channels
   WINDOW_SET_TITLE: "window:setTitle",
 
-  // Stats channels
-  STATS_CALCULATE: "stats:calculate",
-
   // Token channels
   TOKENS_COUNT_BULK: "tokens:countBulk",
 

src/preload.ts

@@ -110,10 +110,6 @@ const api: IPCApi = {
   window: {
     setTitle: (title: string) => ipcRenderer.invoke(IPC_CHANNELS.WINDOW_SET_TITLE, title),
   },
-  stats: {
-    calculate: (workspaceId: string, model: string) =>
-      ipcRenderer.invoke(IPC_CHANNELS.STATS_CALCULATE, workspaceId, model),
-  },
   tokens: {
     countBulk: (model: string, texts: string[]) =>
       ipcRenderer.invoke(IPC_CHANNELS.TOKENS_COUNT_BULK, model, texts),

src/services/ipcMain.ts

@@ -159,7 +159,6 @@ export class IpcMain {
 
     this.registerDialogHandlers(ipcMain);
     this.registerWindowHandlers(ipcMain);
-    this.registerStatsHandlers(ipcMain);
     this.registerTokenHandlers(ipcMain);
     this.registerWorkspaceHandlers(ipcMain);
     this.registerProviderHandlers(ipcMain);
@@ -195,29 +194,7 @@ export class IpcMain {
     });
   }
 
-  private registerStatsHandlers(ipcMain: ElectronIpcMain): void {
-    ipcMain.handle(
-      IPC_CHANNELS.STATS_CALCULATE,
-      async (_event, workspaceId: string, model: string) => {
-        try {
-          const historyResult = await this.historyService.getHistory(workspaceId);
-          if (!historyResult.success) {
-            return null;
-          }
 
-          // Dynamic import to lazy-load tokenizer (prevents ~3-4s startup freeze)
-          // The tokenizer module is large (~2MB) and only needed when viewing costs tab
-          /* eslint-disable no-restricted-syntax */
-          const { calculateTokenStats } = await import("@/utils/tokens/tokenStatsCalculator");
-          /* eslint-enable no-restricted-syntax */
-          return calculateTokenStats(historyResult.data, model);
-        } catch (error) {
-          log.error(`Failed to calculate stats for workspace ${workspaceId}:`, error);
-          return null;
-        }
-      }
-    );
-  }
 
   private registerTokenHandlers(ipcMain: ElectronIpcMain): void {
     ipcMain.handle(

src/types/ipc.ts

@@ -231,9 +231,6 @@ export interface IPCApi {
   window: {
     setTitle(title: string): Promise<void>;
   };
-  stats: {
-    calculate(workspaceId: string, model: string): Promise<ChatStats | null>;
-  };
   tokens: {
     countBulk(model: string, texts: string[]): Promise<number[] | null>;
   };