feat: Add `activityStatus` state and `handleCancel` to App.ts… (+4 more)

- ✅ Add `activityStatus` state and `handleCancel` to App.tsx; update Escape handler
- ✅ Extend `onClaudeMessage` handler: tool_progress, task_progress, restructure result block
- ✅ Pass `activityStatus` and `onCancel` props to `<ChatPane>` in App.tsx
- ✅ Update ChatPane.tsx props interface and loading bubble render
- ✅ Add loading bubble CSS (flex layout, cancel × styles, pulse animation)

3 files changed, 123 insertions, 33 deletions

diff --git a/renderer/src/App.tsx b/renderer/src/App.tsx
index c3eafd4..36d3a82 100644
--- a/renderer/src/App.tsx
+++ b/renderer/src/App.tsx
@@ -52,6 +52,7 @@ export function App() {
   const [documentContent, setDocumentContent] = useState<string>("");
   const [originalContent, setOriginalContent] = useState<string>("");
   const [isLoading, setIsLoading] = useState(false);
+  const [activityStatus, setActivityStatus] = useState<string | null>(null);
   const [tokenUsage, setTokenUsage] = useState<TokenUsage>({
     inputTokens: 0,
     outputTokens: 0,
@@ -84,6 +85,13 @@ export function App() {
     localStorage.setItem("cf-chat-collapsed", String(chatCollapsed));
   }, [chatCollapsed]);
 
+  const handleCancel = () => {
+    if (!selectedSession) return;
+    api.interruptSession(selectedSession.id);
+    setIsLoading(false);
+    setActivityStatus(null);
+  };
+
   const handleToggleTheme = () =>
     setTheme((t) => (t === "dark" ? "light" : "dark"));
 
@@ -121,6 +129,7 @@ export function App() {
       if (e.key === "Escape" && isLoading && selectedSession) {
         api.interruptSession(selectedSession.id);
         setIsLoading(false);
+        setActivityStatus(null);
       }
       // Cmd/Ctrl + Enter to submit
       if (
@@ -178,43 +187,73 @@ export function App() {
     const unsubscribe = api.onClaudeMessage((sessionId, msg) => {
       if (sessionId !== selectedSession?.id) return;
 
-      if (msg.type === "result" && msg.subtype === "success") {
+      // ── Live activity indicator ──────────────────────────────────────
+      // Primary: tool_progress fires periodically while a tool is running
+      if (msg.type === "tool_progress") {
+        const elapsed = Math.round(msg.elapsed_time_seconds);
+        setActivityStatus(
+          elapsed > 0
+            ? `Using ${msg.tool_name} (${elapsed}s)`
+            : `Using ${msg.tool_name}…`
+        );
+      }
+
+      // Secondary: task_progress carries last_tool_name for sub-agent tasks
+      if (
+        msg.type === "system" &&
+        msg.subtype === "task_progress" &&
+        (msg as { last_tool_name?: string }).last_tool_name
+      ) {
+        setActivityStatus(
+          `Using ${(msg as { last_tool_name: string }).last_tool_name}…`
+        );
+      }
+
+      // ── Result (success or error) ────────────────────────────────────
+      // Always clear loading state on any result subtype so error results
+      // don't leave the UI stuck in the loading/thinking state.
+      if (msg.type === "result") {
         setIsLoading(false);
-        if (msg.usage) {
-          setTokenUsage({
-            inputTokens: msg.usage.input_tokens,
-            outputTokens: msg.usage.output_tokens,
-            cacheHits: msg.usage.cache_read_input_tokens,
-          });
-        }
-        // Reload artifact after Claude updates it
-        if (selectedProject && selectedSession) {
-          const filename =
-            selectedSession.phase === "research" ? "research.md" : "plan.md";
-          // Capture for the async closure
-          const sessionAtTrigger = selectedSession;
-          api
-            .readSessionArtifact(selectedProject.id, sessionAtTrigger.id, filename)
-            .then((content) => {
-              const text = content || "";
-              setDocumentContent(text);
-              setOriginalContent(text);
-
-              // Auto-name: only during research, only while name is still the default
-              if (
-                sessionAtTrigger.phase === "research" &&
-                /^Session \d+$/.test(sessionAtTrigger.name) &&
-                text.length > 0
-              ) {
-                const derived = extractSessionName(text);
-                if (derived) {
-                  handleRenameSession(sessionAtTrigger.id, derived);
-                }
-              }
+        setActivityStatus(null);
+
+        if (msg.subtype === "success") {
+          if (msg.usage) {
+            setTokenUsage({
+              inputTokens: msg.usage.input_tokens,
+              outputTokens: msg.usage.output_tokens,
+              cacheHits: msg.usage.cache_read_input_tokens,
             });
+          }
+          // Reload artifact after Claude updates it
+          if (selectedProject && selectedSession) {
+            const filename =
+              selectedSession.phase === "research" ? "research.md" : "plan.md";
+            // Capture for the async closure
+            const sessionAtTrigger = selectedSession;
+            api
+              .readSessionArtifact(selectedProject.id, sessionAtTrigger.id, filename)
+              .then((content) => {
+                const text = content || "";
+                setDocumentContent(text);
+                setOriginalContent(text);
+
+                // Auto-name: only during research, only while name is still the default
+                if (
+                  sessionAtTrigger.phase === "research" &&
+                  /^Session \d+$/.test(sessionAtTrigger.name) &&
+                  text.length > 0
+                ) {
+                  const derived = extractSessionName(text);
+                  if (derived) {
+                    handleRenameSession(sessionAtTrigger.id, derived);
+                  }
+                }
+              });
+          }
         }
       }
 
+      // ── Assistant message ────────────────────────────────────────────
       if (msg.type === "assistant") {
         const content = (
           msg.message.content as Array<{ type: string; text?: string }>
@@ -432,6 +471,8 @@ export function App() {
           collapsed={chatCollapsed}
           chatWidth={chatWidth}
           onToggleCollapse={() => setChatCollapsed((c) => !c)}
+          activityStatus={activityStatus}
+          onCancel={handleCancel}
         />
       </div>
 
diff --git a/renderer/src/components/ChatPane.tsx b/renderer/src/components/ChatPane.tsx
index 40e682c..c2cdfbb 100644
--- a/renderer/src/components/ChatPane.tsx
+++ b/renderer/src/components/ChatPane.tsx
@@ -10,6 +10,8 @@ interface ChatPaneProps {
   collapsed: boolean;
   chatWidth: number;
   onToggleCollapse: () => void;
+  activityStatus?: string | null;
+  onCancel?: () => void;
 }
 
 export function ChatPane({
@@ -21,6 +23,8 @@ export function ChatPane({
   collapsed,
   chatWidth,
   onToggleCollapse,
+  activityStatus,
+  onCancel,
 }: ChatPaneProps) {
   const [input, setInput] = useState("");
   const messagesEndRef = useRef<HTMLDivElement>(null);
@@ -57,7 +61,18 @@ export function ChatPane({
             ))}
             {isLoading && (
               <div className="message assistant loading">
-                <div className="message-content">Thinking...</div>
+                <div className="message-content">
+                  <span>{activityStatus ?? "Thinking…"}</span>
+                  {onCancel && (
+                    <button
+                      className="loading-cancel-x"
+                      onClick={onCancel}
+                      title="Cancel (Esc)"
+                    >
+                      ×
+                    </button>
+                  )}
+                </div>
               </div>
             )}
             <div ref={messagesEndRef} />
diff --git a/renderer/src/styles/globals.css b/renderer/src/styles/globals.css
index 03c7443..7a8ae45 100644
--- a/renderer/src/styles/globals.css
+++ b/renderer/src/styles/globals.css
@@ -490,6 +490,40 @@ html[data-theme="light"] .session-rename-input {
 .message.loading {
   color: var(--text-secondary);
   font-style: italic;
+  animation: thinking-pulse 1.8s ease-in-out infinite;
+}
+
+/* Flex row so the activity text and cancel × sit on one line */
+.message.loading .message-content {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  white-space: normal;
+}
+
+/* Cancel × button inside the Thinking bubble */
+.loading-cancel-x {
+  background: transparent;
+  border: none;
+  color: var(--text-secondary);
+  cursor: pointer;
+  font-size: 16px;
+  line-height: 1;
+  padding: 0 2px;
+  opacity: 0.45;
+  flex-shrink: 0;
+  font-family: inherit;
+  transition: opacity 0.15s, color 0.15s;
+}
+
+.loading-cancel-x:hover {
+  opacity: 1;
+  color: var(--text-primary);
+}
+
+@keyframes thinking-pulse {
+  0%, 100% { opacity: 0.55; }
+  50%       { opacity: 1;    }
 }
 
 .chat-input {