Refac: Centralize storage file management (#4078)

Co-authored-by: Taylor Mullen <ntaylormullen@google.com>

packages/cli/src/ui/hooks/slashCommandProcessor.ts

@@ -16,6 +16,7 @@ import {
   makeSlashCommandEvent,
   SlashCommandStatus,
   ToolConfirmationOutcome,
+  Storage,
 } from '@google/gemini-cli-core';
 import { useSessionStats } from '../contexts/SessionContext.js';
 import { runExitCleanup } from '../../utils/cleanup.js';
@@ -82,11 +83,14 @@ export const useSlashCommandProcessor = (
     if (!config?.getProjectRoot()) {
       return;
     }
-    return new GitService(config.getProjectRoot());
+    return new GitService(config.getProjectRoot(), config.storage);
   }, [config]);
 
   const logger = useMemo(() => {
-    const l = new Logger(config?.getSessionId() || '');
+    const l = new Logger(
+      config?.getSessionId() || '',
+      config?.storage ?? new Storage(process.cwd()),
+    );
     // The logger's initialize is async, but we can create the instance
     // synchronously. Commands that use it will await its initialization.
     return l;