feat(cli): add streaming output to Dashboard and child process termination

- Add broadcastStreamEvent() for real-time CLI output to Dashboard
- Send CLI_EXECUTION_STARTED/OUTPUT/COMPLETED events via /api/hook
- Add killCurrentCliProcess() to terminate child CLI on SIGINT/SIGTERM
- Track child process reference for cleanup on interruption
- Make CLI stream viewer panel full-height (calc(100vh - 32px))
- Fix completion status not updating by using consistent executionId

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ccw/src/templates/dashboard-css/33-cli-stream-viewer.css

@@ -22,11 +22,12 @@
 /* ===== Main Panel ===== */
 .cli-stream-viewer {
   position: fixed;
-  top: 60px;
+  top: 16px;
   right: 16px;
-  width: 650px;
+  bottom: 16px;
+  width: 700px;
   max-width: calc(100vw - 32px);
-  max-height: calc(100vh - 80px);
+  height: calc(100vh - 32px);
   background: hsl(var(--card));
   border: 1px solid hsl(var(--border));
   border-radius: 8px;
@@ -357,8 +358,7 @@
 /* ===== Terminal Content ===== */
 .cli-stream-content {
   flex: 1;
-  min-height: 300px;
-  max-height: 500px;
+  min-height: 0;
   overflow-y: auto;
   padding: 12px 16px;
   background: hsl(220 13% 8%);
@@ -566,15 +566,11 @@
 /* ===== Responsive ===== */
 @media (max-width: 768px) {
   .cli-stream-viewer {
-    top: 56px;
+    top: 8px;
     right: 8px;
     left: 8px;
+    bottom: 8px;
     width: auto;
-    max-height: calc(100vh - 72px);
-  }
-  
-  .cli-stream-content {
-    min-height: 200px;
-    max-height: 350px;
+    height: calc(100vh - 16px);
   }
 }