diff --git a/apps/detail-agent-pi/src/workflow-execute.mjs b/apps/detail-agent-pi/src/workflow-execute.mjs
index 26fcd45d..1813f7e1 100644
--- a/apps/detail-agent-pi/src/workflow-execute.mjs
+++ b/apps/detail-agent-pi/src/workflow-execute.mjs
@@ -2,8 +2,13 @@ import { randomUUID } from 'node:crypto';
 import { setTimeout as delay } from 'node:timers/promises';
 import { workflowResult } from './workflow-context.mjs';
 
+// The native image worker can wait 10 minutes for the POST and 3 more for
+// read-only recovery. Leave one minute for local preparation and final receipts.
+const IMAGE_OPERATION_WAIT_MS = 14 * 60_000;
+const LOCAL_OPERATION_WAIT_MS = 120_000;
+
 // One new operation, then only read its status. No transport or model retry.
-export async function executeWorkflow(host, args, signal, { timeoutMs = 120000, pause = delay } = {}) {
+export async function executeWorkflow(host, args, signal, { timeoutMs, pause = delay } = {}) {
   if (host.canvasNotificationsDetached || host.canvasWritesStopped) throw Error('原项目已切换或原操作需核查，本轮不再派发');
   if (host.nativeUnresolved) throw Error('原操作结果未知，先核查原请求；可使用 native_reconcile 只读核查，不会重发');
   if (host.nativeToolActive) throw Error('已有原生操作正在执行，请依次等待');
@@ -30,13 +35,13 @@ export async function executeWorkflow(host, args, signal, { timeoutMs = 120000,
       if (host.canvasNotificationsDetached || host.canvasWritesStopped) throw Error('原项目已切换或用户已接手，未派发采纳');
     }
     dispatched = true;
-    const deadline = Date.now() + timeoutMs;
+    const saveDeadline = Date.now() + (timeoutMs ?? LOCAL_OPERATION_WAIT_MS);
     let result = await host.canvas.workflowExecute({ ...args, operationId });
     while (result?.operationId === operationId && result.phase === 'waiting_save' && result.dispatched === false) {
       dispatched = false;
       checkTurn();
       signal?.throwIfAborted();
-      if (Date.now() >= deadline) throw Error('项目仍在保存，本次尚未开始处理');
+      if (Date.now() >= saveDeadline) throw Error('项目仍在保存，本次尚未开始处理');
       await pause(100, undefined, { signal });
       checkTurn();
       signal?.throwIfAborted();
@@ -67,9 +72,10 @@ export async function executeWorkflow(host, args, signal, { timeoutMs = 120000,
     }
     if (result?.operationId !== operationId || result.phase !== 'submitted') throw Error('工作流操作提交状态无效，原操作需核查；不会重发');
     await host.store.appendEvent({ type:'workflow_operation_submitted', run:host.canvas.run, operationId, intent:args.intent, slotId:args.slotId, productVariantId:args.productVariantId });
+    const deadline = Date.now() + (timeoutMs ?? (args.intent === 'generate_candidate' ? IMAGE_OPERATION_WAIT_MS : LOCAL_OPERATION_WAIT_MS));
     while (result.phase === 'submitted' && Date.now() < deadline) {
       signal?.throwIfAborted();
-      await pause(200, undefined, { signal });
+      await pause(args.intent === 'generate_candidate' ? 500 : 200, undefined, { signal });
       result = await host.canvas.workflowPoll(operationId);
       checkTurn();
       if (result?.operationId !== operationId || !['submitted','complete','failed','unknown'].includes(result.phase)) throw Error('工作流操作回执无效，原操作需核查；不会重发');
diff --git a/apps/detail-agent-pi/test/workflow-execute.test.mjs b/apps/detail-agent-pi/test/workflow-execute.test.mjs
index f1dab472..2c3019e6 100644
--- a/apps/detail-agent-pi/test/workflow-execute.test.mjs
+++ b/apps/detail-agent-pi/test/workflow-execute.test.mjs
@@ -66,3 +66,15 @@ test('generation never requests a write lease',async()=>{
   const x=setup(['complete']);x.host.canvas.read=async()=>{throw Error('unexpected canvas read')};x.host.canvas.requestWrite=async()=>{throw Error('unexpected permission')};
   await executeWorkflow(x.host,args,undefined,{pause:async()=>{}});assert.equal(x.host.canvasWriteRequested,undefined);
 });
+
+test('a long image generation keeps polling the original operation after the former two-minute cutoff', async t => {
+  const x = setup(['submitted', 'submitted', 'complete']);
+  let now = 0;
+  t.mock.method(Date, 'now', () => now);
+  const result = await executeWorkflow(x.host, args, undefined, {
+    pause: async () => { now += 65_000; },
+  });
+  assert.equal(result.operation.phase, 'complete');
+  assert.deepEqual(x.calls.map(([type]) => type), ['execute', 'poll', 'poll', 'poll', 'read']);
+  assert.ok(x.calls.filter(([type]) => type === 'poll').every(([, id]) => id === x.calls[0][1].operationId));
+});
diff --git a/apps/detail-photocraft/apps/photocraft/src/jiansun_canvas_workspace.rs b/apps/detail-photocraft/apps/photocraft/src/jiansun_canvas_workspace.rs
index d3476444..6db96f4f 100644
--- a/apps/detail-photocraft/apps/photocraft/src/jiansun_canvas_workspace.rs
+++ b/apps/detail-photocraft/apps/photocraft/src/jiansun_canvas_workspace.rs
@@ -823,8 +823,14 @@ impl Backend {
             let brand = json!({"name":creation["brief"]["brandName"],"tone":profile["tone"],"visualRules":visual.chars().take(4000).collect::<String>(),"fontFamily":"Noto Sans SC"});
             let call = self.image_job(Some(Arc::new(references)), &json!({"doc":doc,"revision":input["baseRevision"],"model":model,"mode":if parent.is_some(){"refine"}else{"generate"},"text":prompt,"screen":output["name"],"references":layers,"slotBinding":binding,"slotFrame":field["frame"],"brand":if knowledge.is_null(){brand}else{json!({"name":creation["brief"]["brandName"],"knowledge":knowledge})},"facts":creation["facts"]}), false, events, ctx);
             let file = dir.join("image-jobs").join(&candidate).join("task.json");
-            let journal =
+            let mut journal =
                 if file.is_file() { read_json(&file)? } else { json!({"id":candidate,"slotBinding":binding,"phase":"prepared","notDispatched":true}) };
+            let mut call = call;
+            // Keep the same worker and original candidate until read-only recovery settles.
+            if matches!(journal["phase"].as_str(), Some("dispatched" | "running" | "unknown")) {
+                call = self.recover_original_image(doc, &candidate, events, ctx);
+                journal = read_json(&file)?;
+            }
             candidate_result = Some(candidate_receipt(&reconcile_candidate(&dir, &journal)?));
             operation_error = call.err();
         } else if method == "slot-recover" {
diff --git a/apps/detail-photocraft/apps/photocraft/src/jiansun_images.rs b/apps/detail-photocraft/apps/photocraft/src/jiansun_images.rs
index 098cf354..ad7ff5ad 100644
--- a/apps/detail-photocraft/apps/photocraft/src/jiansun_images.rs
+++ b/apps/detail-photocraft/apps/photocraft/src/jiansun_images.rs
@@ -343,6 +343,8 @@ pub(super) fn retry_original_queries(
             _ => return result,
         };
         let transient = message.contains("processing")
+            || message.contains("原任务仍在生成")
+            || message.contains("HTTP 202")
             || message.contains("连接中断")
             || message.contains("HTTP 502")
             || message.contains("HTTP 503")
@@ -449,6 +451,15 @@ impl Backend {
             egui::ColorImage::from_rgba_unmultiplied([w, h], &rgba),
         ))
     }
+    pub(super) fn recover_original_image(&mut self, doc: u64, task: &str, tx: &mpsc::Sender<Event>, ctx: &egui::Context) -> R<Value> {
+        let started = Instant::now();
+        retry_original_queries(
+            |budget| self.image_job(None, &json!({"doc":doc,"taskId":task,"recoveryBudgetMs":budget.as_millis() as u64}), true, tx, ctx),
+            std::thread::sleep,
+            || started.elapsed(),
+        )
+    }
+
     pub(super) fn image_job(&mut self, doc: Option<Arc<Document>>, input: &Value, recover: bool, tx: &mpsc::Sender<Event>, ctx: &egui::Context) -> R<Value> {
         let deadline = if recover { input["recoveryBudgetMs"].as_u64().map(|ms| Instant::now() + Duration::from_millis(ms.min(180_000))) } else { None };
         let id = doc.as_ref().map(|d| d.id.0).or_else(|| input["doc"].as_u64()).ok_or("请先打开项目")?;
diff --git a/apps/detail-photocraft/crates/ui-egui/src/jiansun.rs b/apps/detail-photocraft/crates/ui-egui/src/jiansun.rs
index db6a8fbf..c84fe33d 100644
--- a/apps/detail-photocraft/crates/ui-egui/src/jiansun.rs
+++ b/apps/detail-photocraft/crates/ui-egui/src/jiansun.rs
@@ -2727,8 +2727,13 @@ impl Workspace {
             self.note("本地 Agent 连接已断开，草稿已保留");
         }
         if self.pi_run.is_some() {
-            let pointer = ui.input(|i| i.pointer.any_pressed() && i.pointer.interact_pos().is_some_and(|p| app.last_canvas_rect.contains(p)));
-            if pointer || current != self.owner_doc.map(|id| (id, self.expected_revision)) {
+            // Browsing is allowed during conversation and candidate generation.
+            // A primary press can still interrupt an explicitly authorized canvas write.
+            let editing_pointer = self.allow_apply && ui.input(|input| {
+                input.pointer.primary_pressed()
+                    && input.pointer.interact_pos().is_some_and(|position| app.last_canvas_rect.contains(position))
+            });
+            if editing_pointer || current != self.owner_doc.map(|id| (id, self.expected_revision)) {
                 self.handover();
             }
         }
diff --git a/apps/detail-photocraft/crates/ui-egui/src/jiansun/workflow_bridge.rs b/apps/detail-photocraft/crates/ui-egui/src/jiansun/workflow_bridge.rs
index 89469878..9447152a 100644
--- a/apps/detail-photocraft/crates/ui-egui/src/jiansun/workflow_bridge.rs
+++ b/apps/detail-photocraft/crates/ui-egui/src/jiansun/workflow_bridge.rs
@@ -540,15 +540,26 @@ fn execute(w: &mut Workspace, app: &mut PhotocraftApp, input: &Value, version: u
     if w.workflow.operations.iter().filter(|op| matches!(op["phase"].as_str(), Some("complete" | "failed"))).count() < excess {
         return Err("本次会话操作记录已达上限，未执行新操作".into());
     }
-    if !available || w.pi_write_blocked || w.agent_effects_paused || w.unknown || w.pi_unknown || w.unknown_image
-        || w.agent_native.cancelled(&run) || w.pending_project_open.is_some() || !w.queue.is_empty()
-        || w.pending_image.is_some() || w.pending_slot_apply.is_some()
+    if !available || w.pending_project_open.is_some() {
+        return Err("当前项目资料尚未就绪或已切换，请确认项目后继续".into());
+    }
+    if w.unknown || w.pi_unknown || w.unknown_image {
+        return Err("有一项原请求需要核查，请先查看该请求的结果".into());
+    }
+    if app.session.active().is_none_or(|active| active.revision != w.expected_revision) {
+        return Err("画布版本已变化，请确认当前图位后继续".into());
+    }
+    if w.pi_write_blocked || w.agent_effects_paused || w.agent_native.cancelled(&run) {
+        return Err("当前回合的画布操作已取消，可在对话中确认下一步".into());
+    }
+    if w.config || w.model_settings || w.key_settings || !w.api_key.is_empty() || w.delete_confirm.is_some()
+        || app.file_dialog_open() || app.discard.is_some() {
+        return Err("请先完成当前设置或确认窗口中的操作".into());
+    }
+    if !w.queue.is_empty() || w.pending_image.is_some() || w.pending_slot_apply.is_some()
         || w.canvas_workspace.scope_switch_in_flight || w.canvas_workspace.pending_adoption.is_some()
-        || w.workflow.operation_in_flight(&run) || w.busy.as_deref() != Some("pi-agent")
-        || w.config || w.model_settings || w.key_settings || !w.api_key.is_empty() || w.delete_confirm.is_some()
-        || app.file_dialog_open() || app.discard.is_some()
-        || app.session.active().is_none_or(|active| active.revision != w.expected_revision) {
-        return Err("用户已接手或原任务尚未落定，未执行操作".into());
+        || w.workflow.operation_in_flight(&run) || w.busy.as_deref() != Some("pi-agent") {
+        return Err("工作台正在处理其他操作，请等它结束后继续".into());
     }
     if w.template_workflow["canvasFirst"] != true || input["version"].as_u64() != Some(version) || w.workflow.last_read_version != Some(version) {
         return Err("工作流已变化或不支持直接执行，请重新读取".into());
@@ -1171,6 +1182,31 @@ mod tests {
         assert!(requests.try_recv().is_err());
     }
 
+    #[test]
+    fn canvas_click_or_pan_without_edits_does_not_stop_candidate_dispatch() {
+        for button in [egui::PointerButton::Primary, egui::PointerButton::Middle] {
+            let (mut w, mut app, requests, ctx) = direct_fixture();
+            w.observed_doc = w.owner_doc;
+            app.last_canvas_rect = egui::Rect::from_min_size(egui::Pos2::ZERO, egui::vec2(800.0, 600.0));
+            let position = egui::pos2(100.0, 100.0);
+            let input = egui::RawInput {
+                screen_rect: Some(app.last_canvas_rect),
+                events: vec![
+                    egui::Event::PointerMoved(position),
+                    egui::Event::PointerButton { pos: position, button, pressed: true, modifiers: Default::default() },
+                ],
+                ..Default::default()
+            };
+            let mut frame = ctx.run_ui(input, |ui| assert!(w.tick_context(&mut app, ui)));
+            frame.textures_delta.clear();
+            let read = private_call(&mut w, &mut app, &ctx, "pi-workflow-read", json!({})).unwrap();
+            let result = private_call(&mut w, &mut app, &ctx, "pi-workflow-execute", direct_input(read["version"].clone())).unwrap();
+            assert_eq!(result["phase"], "submitted", "{button:?}: {result}");
+            assert!(result["__workflowDelegation"].is_object());
+            assert!(requests.try_recv().is_err(), "only the delegation can dispatch the candidate");
+        }
+    }
+
     #[test]
     fn private_dispatch_waits_for_save_ack_before_one_delegation() {
         let (mut w, mut app, requests, ctx) = direct_fixture();
@@ -1211,6 +1247,14 @@ mod tests {
             assert_eq!(rejected["phase"], "not_dispatched", "{scenario}");
             assert_eq!(rejected["accepted"], false);
             assert_eq!(rejected["dispatched"], false);
+            assert_eq!(rejected["error"]["message"], match scenario {
+                "stale" => "工作流已变化或不支持直接执行，请重新读取",
+                "handover" => "当前回合的画布操作已取消，可在对话中确认下一步",
+                "unknown" => "有一项原请求需要核查，请先查看该请求的结果",
+                "drift" => "画布版本已变化，请确认当前图位后继续",
+                "adoption" => "本轮原生操作尚未取得当前修订许可",
+                _ => unreachable!(),
+            });
             assert_eq!(rejected["run"], w.pi_run.as_deref().unwrap());
             assert_eq!(rejected["documentId"], w.owner_doc.unwrap());
             assert_eq!(rejected["baseRevision"], app.session.active().unwrap().revision);