feat(ui): LED projet — exploite les signaux d'interaction CLI custom (#198, QA verte)

Projette l'état d'interaction agent→projet sur la LED via des signaux explicites de la CLI custom:

- projectCliInteractionActivity: modèle d'activité d'interaction (InteractionStarted/Finished/Stopped, interactionId/seq, version).

- useProjectActivity + ProjectTabs: projection live « interaction en cours » → LED, retour immédiat à l'état attendu au stop ou à la fin réelle de l'échange (pas d'état collant).

- CustomAgentChatView: émet les signaux d'interaction CLI custom (début d'envoi, fin de tour, stop) consommés par l'activité projet — sans dériver la LED du texte streamé ou d'heuristiques.

Tout côté frontend: aucun signal runtime manquant (les signaux proviennent de la CLI custom).

Tests QA verts: projectActivity.test.ts, ProjectTabs.test.tsx (+ useProjectActivity.test.tsx, CustomAgentChatView.test.tsx).

frontend/src/features/agents/CustomAgentChatView.test.tsx

@@ -5,6 +5,10 @@ import { beforeEach, describe, expect, it, vi } from "vitest";
 import { DIProvider } from "@/app/di";
 import type { AgentProfile, ReplyChunk } from "@/domain";
 import { PluginRuntimeProvider } from "@/features/plugins";
+import {
+  __resetProjectCliInteractionActivityForTests,
+  hasProjectCliInteraction,
+} from "@/features/projects/projectCliInteractionActivity";
 import {
   PluginCommandRegistry,
   PluginLayoutRegistry,
@@ -71,6 +75,7 @@ describe("CustomAgentChatView", () => {
   beforeEach(() => {
     vi.clearAllMocks();
     __clearCustomAgentChatViewCacheForTests();
+    __resetProjectCliInteractionActivityForTests();
   });
 
   it("repaints attachment labels from user prompt scrollback", async () => {
@@ -381,6 +386,7 @@ describe("CustomAgentChatView", () => {
         expect.any(Function),
       ),
     );
+    expect(hasProjectCliInteraction("project-1")).toBe(true);
     expect(screen.queryByRole("button", { name: "Cancel" })).toBeNull();
 
     fireEvent.click(await screen.findByRole("button", { name: "Stop" }));
@@ -396,6 +402,7 @@ describe("CustomAgentChatView", () => {
       kind: "structured",
     });
     await waitFor(() => expect(onSessionId).toHaveBeenCalledWith(null));
+    expect(hasProjectCliInteraction("project-1")).toBe(false);
     expect(agent.cancelAgentChat).not.toHaveBeenCalled();
     expect(agent.closeAgentChat).not.toHaveBeenCalled();
     expect(
@@ -514,6 +521,7 @@ describe("CustomAgentChatView", () => {
     fireEvent.click(screen.getByRole("button", { name: "Envoyer" }));
 
     await screen.findByText("done");
+    expect(hasProjectCliInteraction("project-1")).toBe(false);
     expect(screen.getAllByText("hello agent")).toHaveLength(1);
     expect(screen.getByText("Terminé").parentElement?.parentElement?.className).toContain(
       "justify-end",

frontend/src/features/agents/CustomAgentChatView.tsx

@@ -27,6 +27,11 @@ import type {
 } from "@/domain";
 import { useGateways } from "@/app/di";
 import { usePluginRuntime } from "@/features/plugins/PluginRuntimeProvider";
+import {
+  markProjectCliInteractionFinished,
+  markProjectCliInteractionStarted,
+  markProjectCliInteractionStopped,
+} from "@/features/projects/projectCliInteractionActivity";
 import { Button, Spinner, cn } from "@/shared";
 import type { ChatAttachmentInput, ChatDraftScope } from "@/ports";
 
@@ -638,6 +643,8 @@ export function CustomAgentChatView({
   detachAgentChatRef.current = agent.detachAgentChat;
   const slashQuerySeqRef = useRef(0);
   const draftSaveSeqRef = useRef(0);
+  const interactionSeqRef = useRef(0);
+  const activeInteractionIdRef = useRef<string | null>(null);
   const draftHydratedRef = useRef(false);
   const draftEditedBeforeHydrationRef = useRef(false);
   const lastPersistedDraftRef = useRef("");
@@ -731,10 +738,33 @@ export function CustomAgentChatView({
   const receive = useCallback(
     (chunk: ReplyChunk) => {
       scrollbackChunkCountRef.current += 1;
+      const activeInteractionId = activeInteractionIdRef.current;
+      if (
+        activeInteractionId &&
+        chunk.kind === "progress" &&
+        chunk.progress.kind === "turn"
+      ) {
+        if (
+          chunk.progress.stage === "started" ||
+          chunk.progress.stage === "delta"
+        ) {
+          markProjectCliInteractionStarted(projectId, activeInteractionId);
+        }
+        if (chunk.progress.stage === "completed") {
+          markProjectCliInteractionFinished(projectId, activeInteractionId);
+          activeInteractionIdRef.current = null;
+        }
+      }
       updateChatViewState((prev) => foldChunk(prev, chunk));
-      if (chunk.kind === "final" || chunk.kind === "error") setBusy(false);
+      if (chunk.kind === "final" || chunk.kind === "error") {
+        if (activeInteractionIdRef.current) {
+          markProjectCliInteractionFinished(projectId, activeInteractionIdRef.current);
+          activeInteractionIdRef.current = null;
+        }
+        setBusy(false);
+      }
     },
-    [updateChatViewState],
+    [projectId, updateChatViewState],
   );
 
   useEffect(() => {
@@ -1328,6 +1358,14 @@ export function CustomAgentChatView({
     const attachmentInputs = outgoingAttachments.map((item) => item.input);
     const attachmentLabels = outgoingAttachments.map((item) => item.label);
     const displayText = text || "Pièce jointe";
+    const interactionId = `${agentId}:${++interactionSeqRef.current}`;
+    activeInteractionIdRef.current = interactionId;
+    markProjectCliInteractionStarted(projectId, interactionId);
+    const finishInteraction = () => {
+      if (activeInteractionIdRef.current !== interactionId) return;
+      markProjectCliInteractionFinished(projectId, interactionId);
+      activeInteractionIdRef.current = null;
+    };
     setDraft("");
     setAttachments([]);
     void clearPersistedDraft();
@@ -1356,6 +1394,7 @@ export function CustomAgentChatView({
           retryAttachNotFound: true,
         }));
       await sendTurn(sid);
+      finishInteraction();
     } catch (e) {
       if (isNotFound(e)) {
         try {
@@ -1366,8 +1405,10 @@ export function CustomAgentChatView({
             retryAttachNotFound: true,
           });
           await sendTurn(recoveredSession);
+          finishInteraction();
           return;
         } catch (recoveryError) {
+          finishInteraction();
           setBusy(false);
           setError(describe(recoveryError));
           updateChatViewState((prev) => ({
@@ -1377,6 +1418,7 @@ export function CustomAgentChatView({
           return;
         }
       }
+      finishInteraction();
       setBusy(false);
       setError(describe(e));
       updateChatViewState((prev) => ({
@@ -1393,6 +1435,10 @@ export function CustomAgentChatView({
     setError(null);
     try {
       const stopped = await agent.stopLiveAgent(projectId, agentId);
+      if (activeInteractionIdRef.current) {
+        markProjectCliInteractionStopped(projectId, activeInteractionIdRef.current);
+        activeInteractionIdRef.current = null;
+      }
       setBusy(false);
       setOpening(false);
       setCurrentSession(null);
@@ -1415,6 +1461,10 @@ export function CustomAgentChatView({
       });
     } catch (e) {
       if (isNotFound(e)) {
+        if (activeInteractionIdRef.current) {
+          markProjectCliInteractionStopped(projectId, activeInteractionIdRef.current);
+          activeInteractionIdRef.current = null;
+        }
         setBusy(false);
         setOpening(false);
         setCurrentSession(null);