feat: add CommandCombobox component for selecting slash commands and update PropertyPanel to use it

refactor: remove unused liteTasks localization from common.json and zh/common.json
refactor: consolidate liteTasks localization into lite-tasks.json and zh/lite-tasks.json
refactor: simplify MultiCliTab type in LiteTaskDetailPage
refactor: enhance task display in LiteTasksPage with additional metadata

ccw/frontend/src/locales/en/common.json

@@ -267,71 +267,6 @@
       "expandAria": "Expand sidebar"
     }
   },
-  "liteTasks": {
-    "title": "Lite Tasks",
-    "type": {
-      "plan": "Lite Plan",
-      "fix": "Lite Fix",
-      "multiCli": "Multi-CLI Plan"
-    },
-    "quickCards": {
-      "tasks": "Tasks",
-      "context": "Context"
-    },
-    "multiCli": {
-      "discussion": "Discussion",
-      "discussionRounds": "Discussion Rounds",
-      "discussionDescription": "Multi-CLI collaborative planning with iterative analysis and cross-verification",
-      "summary": "Summary",
-      "goal": "Goal",
-      "solution": "Solution",
-      "implementation": "Implementation",
-      "feasibility": "Feasibility",
-      "risk": "Risk",
-      "planSummary": "Plan Summary"
-    },
-    "createdAt": "Created",
-    "rounds": "rounds",
-    "tasksCount": "tasks",
-    "untitled": "Untitled Task",
-    "discussionTopic": "Discussion Topic",
-    "contextPanel": {
-      "loading": "Loading context data...",
-      "error": "Failed to load context",
-      "empty": "No context data available",
-      "explorations": "Explorations",
-      "explorationsCount": "{count} explorations",
-      "diagnoses": "Diagnoses",
-      "diagnosesCount": "{count} diagnoses",
-      "contextPackage": "Context Package",
-      "focusPaths": "Focus Paths",
-      "summary": "Summary",
-      "taskDescription": "Task Description",
-      "complexity": "Complexity"
-    },
-    "status": {
-      "completed": "Completed",
-      "inProgress": "In Progress",
-      "blocked": "Blocked",
-      "pending": "Pending"
-    },
-    "subtitle": "{count} sessions",
-    "empty": {
-      "title": "No {type} sessions",
-      "message": "No sessions found for this type"
-    },
-    "noResults": {
-      "title": "No results",
-      "message": "No sessions match your search"
-    },
-    "searchPlaceholder": "Search sessions...",
-    "sortBy": "Sort by",
-    "sort": {
-      "date": "Date",
-      "name": "Name",
-      "tasks": "Tasks"
-    }
-  },
   "askQuestion": {
     "defaultTitle": "Questions",
     "description": "Please answer the following questions",