fix(core,cli): properly resolve nested paths and plan dirs in exit_plan_mode

- **exit_plan_mode.ts**: Fixed an issue where `path.basename` incorrectly stripped nested directories (e.g., `tracks/123/index.md` to `index.md`) by adopting `resolveAndValidatePlanPath`.
- **UI Components**: Updated `ExitPlanModeDialog.tsx` and `planCommand.ts` to use `config.getPlansDir()` instead of `config.storage.getPlansDir()`. This ensures the UI respects active extension plan directories (like Conductor) rather than falling back to the default temporary directory.
- **write-file.ts**: Updated to use `config.getPlansDir()` for consistency.

packages/cli/src/ui/commands/planCommand.ts

@@ -82,7 +82,7 @@ export const planCommand: SlashCommand = {
     try {
       const content = await processSingleFileContent(
         approvedPlanPath,
-        config.storage.getPlansDir(),
+        config.getPlansDir(),
         config.getFileSystemService(),
       );
       const fileName = path.basename(approvedPlanPath);

packages/cli/src/ui/components/ExitPlanModeDialog.tsx

@@ -84,7 +84,7 @@ function usePlanContent(planPath: string, config: Config): PlanContentState {
       try {
         const pathError = await validatePlanPath(
           planPath,
-          config.storage.getPlansDir(),
+          config.getPlansDir(),
         );
         if (ignore) return;
         if (pathError) {
@@ -101,7 +101,7 @@ function usePlanContent(planPath: string, config: Config): PlanContentState {
 
         const result = await processSingleFileContent(
           planPath,
-          config.storage.getPlansDir(),
+          config.getPlansDir(),
           config.getFileSystemService(),
         );