fix(multi-cli): populate multiCliPlan sessions in liteTaskDataStore

Fix task click handlers not working in multi-CLI planning detail page.

Root cause: liteTaskDataStore was not being populated with multiCliPlan
sessions during initialization, so task click handlers couldn't access
session data using currentSessionDetailKey.

Changes:
- navigation.js: Add code to populate multiCliPlan sessions in liteTaskDataStore
- notifications.js: Add code to populate multiCliPlan sessions when data refreshes

Now when task detail page loads, liteTaskDataStore contains the correct key
'multi-cli-${sessionId}' matching currentSessionDetailKey, allowing task
click handlers to find session data and open detail drawer.

Verified: Task clicks now properly open detail panel for all 7 tasks.

ccw/src/utils/codexlens-path.ts

@@ -0,0 +1,60 @@
+/**
+ * CodexLens Path Utilities
+ *
+ * Provides centralized path resolution for CodexLens data directory,
+ * respecting the CODEXLENS_DATA_DIR environment variable.
+ *
+ * Priority order (matching Python implementation):
+ * 1. CODEXLENS_DATA_DIR environment variable
+ * 2. Default: ~/.codexlens
+ */
+
+import { join } from 'path';
+import { homedir } from 'os';
+
+/**
+ * Get the CodexLens data directory.
+ * Respects CODEXLENS_DATA_DIR environment variable.
+ *
+ * @returns Path to CodexLens data directory
+ */
+export function getCodexLensDataDir(): string {
+  const envOverride = process.env.CODEXLENS_DATA_DIR;
+  if (envOverride) {
+    return envOverride;
+  }
+  return join(homedir(), '.codexlens');
+}
+
+/**
+ * Get the CodexLens virtual environment path.
+ *
+ * @returns Path to CodexLens venv directory
+ */
+export function getCodexLensVenvDir(): string {
+  return join(getCodexLensDataDir(), 'venv');
+}
+
+/**
+ * Get the Python executable path in the CodexLens venv.
+ *
+ * @returns Path to python executable
+ */
+export function getCodexLensPython(): string {
+  const venvDir = getCodexLensVenvDir();
+  return process.platform === 'win32'
+    ? join(venvDir, 'Scripts', 'python.exe')
+    : join(venvDir, 'bin', 'python');
+}
+
+/**
+ * Get the pip executable path in the CodexLens venv.
+ *
+ * @returns Path to pip executable
+ */
+export function getCodexLensPip(): string {
+  const venvDir = getCodexLensVenvDir();
+  return process.platform === 'win32'
+    ? join(venvDir, 'Scripts', 'pip.exe')
+    : join(venvDir, 'bin', 'pip');
+}

ccw/src/utils/uv-manager.ts

@@ -14,6 +14,7 @@ import { existsSync, mkdirSync } from 'fs';
 import { join, dirname } from 'path';
 import { homedir, platform, arch } from 'os';
 import { EXEC_TIMEOUTS } from './exec-constants.js';
+import { getCodexLensDataDir, getCodexLensVenvDir } from './codexlens-path.js';
 
 /**
  * Configuration for UvManager
@@ -767,9 +768,9 @@ export class UvManager {
  * @returns Configured UvManager instance
  */
 export function createCodexLensUvManager(dataDir?: string): UvManager {
-  const baseDir = dataDir ?? join(homedir(), '.codexlens');
+  const baseDir = dataDir ?? getCodexLensDataDir();
   return new UvManager({
-    venvPath: join(baseDir, 'venv'),
+    venvPath: getCodexLensVenvDir(),
     pythonVersion: '>=3.10,<3.13', // onnxruntime compatibility
   });
 }