fix: support canvas view prompts without context payload

app/(chat)/api/chat/route.ts

@@ -881,6 +881,16 @@ export async function POST(request: Request) {
         return "";
       }
     })();
+    const isCanvasPageRequest = (() => {
+      const referer = request.headers.get("referer");
+      if (!referer) return false;
+      try {
+        const pathname = new URL(referer).pathname;
+        return pathname === "/canvas" || pathname.startsWith("/canvas/");
+      } catch {
+        return false;
+      }
+    })();
     const requestTextContent = message.parts
       .filter((part): part is { type: "text"; text: string } => part.type === "text")
       .map((part) => part.text)
@@ -900,7 +910,8 @@ export async function POST(request: Request) {
       composerMode !== "agent" &&
       (contextPayload?.source === "canvas" ||
         contextPayload?.source === "realtime-canvas" ||
-        Boolean(requestCanvasAgentContext)) &&
+        Boolean(requestCanvasAgentContext) ||
+        isCanvasPageRequest) &&
       shouldBypassCanvasImagePointsPrecheckForAgentControl({
         text: requestTextContent,
         activeComposerMode: composerMode,
@@ -3213,8 +3224,11 @@ export async function POST(request: Request) {
     const resolveCanvasViewOperationPlan = (): CanvasViewOperationPlan | null => {
       if (!canvasAgentFeatures.viewOperationEnabled) return null;
       if (composerMode !== "agent" && !hasCanvasControlIntentFastPath) return null;
-      if (contextPayload?.source !== "canvas" || !contextPayload.projectId) return null;
+      const projectId =
-      if (!requestCanvasAgentContext) return null;
+        contextPayload?.projectId ||
+        requestCanvasAgentContext?.projectId ||
+        (hasCanvasControlIntentFastPath ? id : undefined);
+      if (!projectId) return null;
 
       const text = requestTextContent.trim();
       if (!text) return null;
@@ -3234,10 +3248,48 @@ export async function POST(request: Request) {
 
       const viewOperationId = `${message.id}:canvas-view:${Date.now()}`;
 
+      if (!requestCanvasAgentContext) {
+        if (/看全局|看整体|看全部|全局|整体/.test(lowerText)) {
+          return {
+            version: 1,
+            viewOperationId,
+            operation: "fit_all",
+            projectId,
+            padding: 140,
+            persist: false,
+            reason: "fit_all_canvas",
+          };
+        }
+
+        if (/缩小|拉远|zoom\s*out/.test(lowerText)) {
+          return {
+            version: 1,
+            viewOperationId,
+            operation: "zoom_out",
+            projectId,
+            persist: false,
+            reason: "zoom_out_canvas",
+          };
+        }
+
+        if (/放大|拉近|zoom\s*in/.test(lowerText)) {
+          return {
+            version: 1,
+            viewOperationId,
+            operation: "zoom_in",
+            projectId,
+            persist: false,
+            reason: "zoom_in_canvas",
+          };
+        }
+
+        return null;
+      }
+
       if (hasLatestResultViewIntent) {
         const latestResultViewPlan = buildCanvasAgentLatestResultViewPlan({
           userText: text,
-          projectId: contextPayload.projectId,
+          projectId,
           operationId: viewOperationId,
         });
         if (latestResultViewPlan) return latestResultViewPlan;
@@ -3270,7 +3322,7 @@ export async function POST(request: Request) {
       if (hasComparisonViewIntent) {
         const comparisonViewPlan = buildCanvasAgentComparisonViewPlan({
           context: requestCanvasAgentContext,
-          projectId: contextPayload.projectId,
+          projectId,
           operationId: viewOperationId,
         });
         if (comparisonViewPlan) return comparisonViewPlan;
@@ -3281,7 +3333,7 @@ export async function POST(request: Request) {
           version: 1,
           viewOperationId,
           operation: "fit_all",
-          projectId: contextPayload.projectId,
+          projectId,
           padding: 140,
           persist: false,
           reason: "fit_all_canvas",
@@ -3293,7 +3345,7 @@ export async function POST(request: Request) {
           version: 1,
           viewOperationId,
           operation: "zoom_out",
-          projectId: contextPayload.projectId,
+          projectId,
           persist: false,
           reason: "zoom_out_canvas",
         };
@@ -3313,7 +3365,7 @@ export async function POST(request: Request) {
           version: 1,
           viewOperationId,
           operation: nodeIds.length > 1 ? "focus_nodes" : "focus_selection",
-          projectId: contextPayload.projectId,
+          projectId,
           nodeIds,
           anchorNodeId: anchorNode?.nodeId,
           padding: 120,
@@ -3326,7 +3378,7 @@ export async function POST(request: Request) {
         const panViewPlan = buildCanvasAgentPanViewPlan({
           userText: text,
           context: requestCanvasAgentContext,
-          projectId: contextPayload.projectId,
+          projectId,
           operationId: viewOperationId,
         });
         if (panViewPlan) return panViewPlan;
@@ -3337,7 +3389,7 @@ export async function POST(request: Request) {
           version: 1,
           viewOperationId,
           operation: "zoom_in",
-          projectId: contextPayload.projectId,
+          projectId,
           persist: false,
           reason: "zoom_in_canvas",
         };