feat(web): refine session defaults and chat affordances

design-system/packages/ui/src/primitives/OverflowText/OverflowText.tsx

@@ -86,15 +86,22 @@ export const OverflowText = forwardRef<HTMLElement, OverflowTextProps>(
       if (!element || !content) return;
 
       const distance = Math.max(0, content.scrollWidth - element.clientWidth);
-      const isOverflowing = element.clientWidth > 0 && (distance > 0
-        || (element.clientHeight > 0 && element.scrollHeight > element.clientHeight));
+      // A compact single-line label can have glyph ink extend slightly beyond
+      // its line box without any text being clipped. Only multiline clamps use
+      // vertical overflow as a truncation signal; single-line slots are clipped
+      // exclusively on the inline axis.
+      const hasVerticalClampOverflow = lines !== undefined
+        && element.clientHeight > 0
+        && element.scrollHeight > element.clientHeight;
+      const isOverflowing = element.clientWidth > 0
+        && (distance > 0 || hasVerticalClampOverflow);
       const current = measurementRef.current;
       if (current.distance === distance && current.isOverflowing === isOverflowing) return;
 
       const next = { distance, isOverflowing };
       measurementRef.current = next;
       setMeasurement(next);
-    }, []);
+    }, [lines]);
 
     const prepareTooltip = useCallback(() => {
       const element = elementRef.current;

design-system/packages/ui/tests/overflow-text.test.mjs

@@ -60,6 +60,7 @@ test("OverflowText measures real clipping for fade and marquee treatments", asyn
   ]);
 
   assert.match(source, /content\.scrollWidth - element\.clientWidth/);
+  assert.match(source, /lines !== undefined\s*&& element\.clientHeight > 0\s*&& element\.scrollHeight > element\.clientHeight/s);
   assert.match(source, /measurementRef\.current/);
   assert.match(
     source,

docs/interactive-capabilities/README.md

@@ -1,9 +1,9 @@
 <!-- generated by scripts/generate-interactive-capabilities.mjs; do not edit -->
 # OpenBitFun 功能与设置目录 / OpenBitFun Features & Settings
 
-OpenBitFun Playbook 当前包含 **22 个功能**和 **21 个设置页**，共 **43 个**用户可理解的条目、**321 项**有源码证据的子能力。每个条目有独立 Markdown，并直接服务于说明书网站、OpenBitFun 全局搜索和 `OpenBitFunControl` Agent 工具。
+OpenBitFun Playbook 当前包含 **22 个功能**和 **21 个设置页**，共 **43 个**用户可理解的条目、**322 项**有源码证据的子能力。每个条目有独立 Markdown，并直接服务于说明书网站、OpenBitFun 全局搜索和 `OpenBitFunControl` Agent 工具。
 
-OpenBitFun Playbook currently contains **22 features**, **21 settings pages**, and **321** source-backed sub-capabilities across **43** user-facing entries. Every entry has its own Markdown page and directly powers the website, in-app global search, and the `OpenBitFunControl` agent tool.
+OpenBitFun Playbook currently contains **22 features**, **21 settings pages**, and **322** source-backed sub-capabilities across **43** user-facing entries. Every entry has its own Markdown page and directly powers the website, in-app global search, and the `OpenBitFunControl` agent tool.
 
 ## 唯一事实源 / Single source of truth
 
@@ -33,14 +33,14 @@ Docs, website, search, and agents see only features, settings, and documented su
 
 ## 控制边界 / Control boundary
 
-- 每个子能力都明确标记为直接控制、委托给专用 Agent 工具、需交互打开或不支持；“打开页面”不会再被统计成“Agent 已控制”。当前覆盖：直接 **48**、委托 **61**、需交互 **212**、不支持 **0**。
+- 每个子能力都明确标记为直接控制、委托给专用 Agent 工具、需交互打开或不支持；“打开页面”不会再被统计成“Agent 已控制”。当前覆盖：直接 **48**、委托 **61**、需交互 **213**、不支持 **0**。
 - 稳定行为声明为带 JSON 输入契约的 `operations` 或 `options`，并绑定原生产品控制 Provider；Agent 不接触原始 Tauri Command。
-- `OpenBitFunControl list` 和 `search` 都返回带 `nextCursor` 的精简分页结果；目录可持续增长，不靠固定总量上限。完整目录和 321 项子能力都不会写入 system prompt。
+- `OpenBitFunControl list` 和 `search` 都返回带 `nextCursor` 的精简分页结果；目录可持续增长，不靠固定总量上限。完整目录和 322 项子能力都不会写入 system prompt。
 - 目录发现与契约读取不依赖 React 或可见窗口。普通配置型 option 统一由 Product Assembly 的共享 ConfigService 执行器读、写并回读，因此 Desktop、CLI 与 Headless 表面走同一份实现；只有宿主原生 operation/provider option 和界面导航按表面注册适配器，缺失时必须明确返回不可用，禁止静默回退本机。只读 Agent 只能发现和读取目录。
 
-- Every documented item is classified as direct control, delegated Agent control, interactive opening, or unsupported; opening a page is never counted as direct control. Current coverage is **48 direct**, **61 delegated**, **212 interactive**, and **0 unsupported**.
+- Every documented item is classified as direct control, delegated Agent control, interactive opening, or unsupported; opening a page is never counted as direct control. Current coverage is **48 direct**, **61 delegated**, **213 interactive**, and **0 unsupported**.
 - Stable behavior becomes a typed `operation` or `option` with a JSON input contract and a native product-control provider. Agents never receive raw Tauri commands.
-- `OpenBitFunControl list` and `search` return compact pages with a `nextCursor`; the catalog can grow without a fixed total-size ceiling. Neither the full catalog nor its 321 documented items enters the system prompt.
+- `OpenBitFunControl list` and `search` return compact pages with a `nextCursor`; the catalog can grow without a fixed total-size ceiling. Neither the full catalog nor its 322 documented items enters the system prompt.
 - Discovery and contract lookup do not depend on React or a visible window. Ordinary config-backed options are read, written, and read back by one Product Assembly ConfigService executor shared by Desktop, CLI, and headless surfaces. Only host-native operations/provider options and presentation routes install surface adapters; missing adapters return explicit unavailability without local fallback. Read-only agents may only discover and inspect entries.
 
 ## 防腐化门禁 / Anti-drift gates

docs/interactive-capabilities/capabilities.json

@@ -4,7 +4,7 @@
   "title": "OpenBitFun Playbook",
   "origin": "https://playbook.openbitfun.com",
   "source": "src/shared/interactive-capabilities/catalog.json",
-  "digest": "d7a7419ddd673eb733ae8bd33dbb3dcd3b4d1ce0acfc953067a3403fe26d6699",
+  "digest": "409e6dbef7ebceafccc11606e2855227b9a33fa1ed71f5b4608da04e8a23de7d",
   "ownerDigest": "c0e5c187cf62bc6ed06196ce8520b3eb427bf268cf24659b72d2552fb1d99c54",
   "searchAcceptance": [
     {
@@ -138,11 +138,11 @@
     "features": 22,
     "settings": 21,
     "userFacing": 43,
-    "documentedItems": 321,
+    "documentedItems": 322,
     "controlCoverage": {
       "direct": 48,
       "delegated": 61,
-      "interactive": 212,
+      "interactive": 213,
       "unsupported": 0
     }
   },
@@ -14816,6 +14816,7 @@
       "id": "setting.workspace.session:query",
       "capabilityId": "setting.workspace.session",
       "itemIds": [
+        "default-agent-harness",
         "automatic-titles",
         "title-model",
         "accelerated-search",
@@ -14949,6 +14950,52 @@
         "pageId": "workspace.session"
       }
     },
+    {
+      "id": "setting.workspace.session:open:default-agent-harness",
+      "capabilityId": "setting.workspace.session",
+      "itemIds": [
+        "default-agent-harness"
+      ],
+      "kind": "open",
+      "risk": "ui",
+      "executionHost": "presentationSurface",
+      "availability": {
+        "desktop": {
+          "available": true
+        },
+        "cli": {
+          "available": false,
+          "reason": "This delivery profile has no live presentation surface"
+        },
+        "peer": {
+          "available": true,
+          "requiredCapabilities": [
+            "product_control_v1",
+            "product_control_presentation_v1"
+          ]
+        },
+        "remoteControl": {
+          "available": true
+        },
+        "detachedDispatch": {
+          "available": false,
+          "reason": "This delivery profile has no live presentation surface"
+        }
+      },
+      "inputSchema": {
+        "type": "object",
+        "additionalProperties": false
+      },
+      "outputSchema": {
+        "type": "object",
+        "additionalProperties": true
+      },
+      "openReason": "unstructuredInteraction",
+      "presentationTarget": {
+        "kind": "settings",
+        "pageId": "workspace.session"
+      }
+    },
     {
       "id": "setting.workspace.session:open:title-model",
       "capabilityId": "setting.workspace.session",
@@ -27132,33 +27179,50 @@
       "categoryId": "assistant",
       "titleZh": "会话与工作区设置",
       "titleEn": "Session & workspace settings",
-      "summaryZh": "控制会话标题生成、工作区加速搜索和与项目上下文相关的行为。",
-      "summaryEn": "Control session-title generation, accelerated workspace search, and project-context behavior.",
+      "summaryZh": "控制默认 Agent Harness、会话标题生成、工作区加速搜索和与项目上下文相关的行为。",
+      "summaryEn": "Control the default Agent Harness, session-title generation, accelerated workspace search, and project-context behavior.",
       "keywordsZh": [
         "会话设置",
         "工作区设置",
+        "默认 Harness",
+        "上次选择",
         "标题生成",
         "项目搜索",
         "索引"
       ],
       "keywordsEn": [
         "session settings",
         "workspace settings",
+        "default Harness",
+        "last selection",
         "title generation",
         "project search",
         "index"
       ],
       "highlightsZh": [
+        "跟随上次选择或固定默认 Harness",
         "自动生成会话标题",
         "本地工作区加速搜索",
         "会话使用的标题模型"
       ],
       "highlightsEn": [
+        "Follow the last selection or fix a default Harness",
         "Automatic session titles",
         "Accelerated local-workspace search",
         "Model used for session titles"
       ],
       "items": [
+        {
+          "id": "default-agent-harness",
+          "titleZh": "让普通新会话跟随 ChatInput 上次选择，或固定使用指定 Harness",
+          "titleEn": "Make regular new sessions follow the last ChatInput selection or use a fixed Harness",
+          "control": {
+            "kind": "open",
+            "reasonCode": "unstructuredInteraction",
+            "reasonZh": "“让普通新会话跟随 ChatInput 上次选择，或固定使用指定 Harness”由会话设置页中的关联控件共同管理，目前没有一个能确定完成整个流程的单一结构化 Command；Agent 会打开精确入口，并把选择保留在用户可见界面。",
+            "reasonEn": "“Make regular new sessions follow the last ChatInput selection or use a fixed Harness” is managed by related controls on the session settings page and currently has no single structured Command that can deterministically complete the whole workflow; the Agent opens the exact entry and keeps the selection visible to the user."
+          }
+        },
         {
           "id": "automatic-titles",
           "titleZh": "启用或停用根据会话内容自动生成标题",
@@ -27224,18 +27288,22 @@
       "stepsZh": [
         "打开设置",
         "进入“工作区 > 会话与工作区”",
-        "调整标题或搜索选项"
+        "调整默认 Harness、标题或搜索选项"
       ],
       "stepsEn": [
         "Open Settings",
         "Go to Workspace > Session & Workspace",
-        "Tune title or search controls"
+        "Tune the default Harness, title, or search controls"
       ],
       "agentExamplesZh": [
+        "让新会话跟随 ChatInput 上一次选择的 Harness",
+        "把新会话固定为 Ultimate Harness",
         "关闭自动生成会话标题",
         "启用工作区加速搜索"
       ],
       "agentExamplesEn": [
+        "Make new sessions follow the last Harness selected in ChatInput",
+        "Fix Ultimate as the Harness for new sessions",
         "Turn off automatic session titles",
         "Enable accelerated workspace search"
       ],
@@ -27274,20 +27342,28 @@
         "AI & collaboration",
         "会话设置",
         "工作区设置",
+        "默认 Harness",
+        "上次选择",
         "标题生成",
         "项目搜索",
         "索引",
         "session settings",
         "workspace settings",
+        "default Harness",
+        "last selection",
         "title generation",
         "project search",
         "index",
+        "跟随上次选择或固定默认 Harness",
         "自动生成会话标题",
         "本地工作区加速搜索",
         "会话使用的标题模型",
+        "Follow the last selection or fix a default Harness",
         "Automatic session titles",
         "Accelerated local-workspace search",
         "Model used for session titles",
+        "让普通新会话跟随 ChatInput 上次选择，或固定使用指定 Harness",
+        "Make regular new sessions follow the last ChatInput selection or use a fixed Harness",
         "启用或停用根据会话内容自动生成标题",
         "Enable or disable automatic titles generated from session content",
         "让标题模型继承主模型、快速模型或使用指定模型",
@@ -27298,8 +27374,12 @@
         "Inspect index status and rebuild the workspace index when needed",
         "远程工作区明确降级搜索实现，不把远程路径回退到本机",
         "Use an explicit remote-workspace search path without silently falling back to local files",
+        "让新会话跟随 ChatInput 上一次选择的 Harness",
+        "把新会话固定为 Ultimate Harness",
         "关闭自动生成会话标题",
         "启用工作区加速搜索",
+        "Make new sessions follow the last Harness selected in ChatInput",
+        "Fix Ultimate as the Harness for new sessions",
         "Turn off automatic session titles",
         "Enable accelerated workspace search"
       ],

docs/interactive-capabilities/capabilities/setting.workspace.session.md

@@ -11,12 +11,14 @@ title_en: "Session & workspace settings"
 
 > 设置 / Setting
 
-控制会话标题生成、工作区加速搜索和与项目上下文相关的行为。
+控制默认 Agent Harness、会话标题生成、工作区加速搜索和与项目上下文相关的行为。
 
-Control session-title generation, accelerated workspace search, and project-context behavior.
+Control the default Agent Harness, session-title generation, accelerated workspace search, and project-context behavior.
 
 ## 完整功能清单 / Everything included
 
+- **Agent 可定位入口，需交互完成 / Agent opens; interaction required** · 让普通新会话跟随 ChatInput 上次选择，或固定使用指定 Harness
+  - Make regular new sessions follow the last ChatInput selection or use a fixed Harness
 - **Agent 可直接控制 / Direct Agent control** · 启用或停用根据会话内容自动生成标题
   - Enable or disable automatic titles generated from session content
 - **Agent 可定位入口，需交互完成 / Agent opens; interaction required** · 让标题模型继承主模型、快速模型或使用指定模型
@@ -34,8 +36,8 @@ Control session-title generation, accelerated workspace search, and project-cont
    Open Settings
 2. 进入“工作区 > 会话与工作区”
    Go to Workspace > Session & Workspace
-3. 调整标题或搜索选项
-   Tune title or search controls
+3. 调整默认 Harness、标题或搜索选项
+   Tune the default Harness, title, or search controls
 
 入口 / Entry: OpenBitFun 设置
 
@@ -54,6 +56,10 @@ Control session-title generation, accelerated workspace search, and project-cont
 
 ## 可以直接对 Agent 说 / Try saying
 
+- “让新会话跟随 ChatInput 上一次选择的 Harness”
+  - “Make new sessions follow the last Harness selected in ChatInput”
+- “把新会话固定为 Ultimate Harness”
+  - “Fix Ultimate as the Harness for new sessions”
 - “关闭自动生成会话标题”
   - “Turn off automatic session titles”
 - “启用工作区加速搜索”

docs/interactive-capabilities/technical/product-control-open-audit.json

@@ -1,12 +1,12 @@
 {
   "schemaVersion": 1,
   "generatedFrom": "src/shared/interactive-capabilities/catalog.json",
-  "catalogDigest": "d7a7419ddd673eb733ae8bd33dbb3dcd3b4d1ce0acfc953067a3403fe26d6699",
-  "count": 212,
+  "catalogDigest": "409e6dbef7ebceafccc11606e2855227b9a33fa1ed71f5b4608da04e8a23de7d",
+  "count": 213,
   "reasonCounts": {
     "externalAuth": 4,
     "secretEntry": 5,
-    "unstructuredInteraction": 185,
+    "unstructuredInteraction": 186,
     "visualSelection": 18
   },
   "entries": [
@@ -2891,6 +2891,23 @@
         "command:reset_config"
       ]
     },
+    {
+      "capabilityId": "setting.workspace.session",
+      "itemId": "default-agent-harness",
+      "titleZh": "让普通新会话跟随 ChatInput 上次选择，或固定使用指定 Harness",
+      "titleEn": "Make regular new sessions follow the last ChatInput selection or use a fixed Harness",
+      "reasonCode": "unstructuredInteraction",
+      "reasonZh": "“让普通新会话跟随 ChatInput 上次选择，或固定使用指定 Harness”由会话设置页中的关联控件共同管理，目前没有一个能确定完成整个流程的单一结构化 Command；Agent 会打开精确入口，并把选择保留在用户可见界面。",
+      "reasonEn": "“Make regular new sessions follow the last ChatInput selection or use a fixed Harness” is managed by related controls on the session settings page and currently has no single structured Command that can deterministically complete the whole workflow; the Agent opens the exact entry and keeps the selection visible to the user.",
+      "presentationTarget": {
+        "kind": "settings",
+        "pageId": "workspace.session"
+      },
+      "evidence": [
+        "source:src/web-ui/src/infrastructure/config/components/DefaultHarnessConfig.tsx#DefaultHarnessConfig",
+        "source:src/web-ui/src/locales/zh-CN/settings/runtime.json#defaultHarness.title"
+      ]
+    },
     {
       "capabilityId": "setting.workspace.session",
       "itemId": "title-model",

docs/interactive-capabilities/technical/tauri-command-map.json

@@ -1,7 +1,7 @@
 {
   "schemaVersion": 2,
   "generatedFrom": "src/shared/interactive-capabilities/catalog.json",
-  "catalogDigest": "d7a7419ddd673eb733ae8bd33dbb3dcd3b4d1ce0acfc953067a3403fe26d6699",
+  "catalogDigest": "409e6dbef7ebceafccc11606e2855227b9a33fa1ed71f5b4608da04e8a23de7d",
   "commandCount": 666,
   "coverage": {
     "commandCount": 666,

src/apps/desktop/src/api/custom_agent_api.rs

@@ -399,9 +399,7 @@ pub async fn delete_custom_agent(
             "",
             |config: &mut openbitfun_core::service::config::GlobalConfig| {
                 config.ai.agent_profiles.remove(&agent_id);
-                if config.app.flow_chat.default_mode_id.as_deref() == Some(agent_id.as_str()) {
-                    config.app.flow_chat.default_mode_id = None;
-                }
+                config.app.flow_chat.remove_mode_reference(&agent_id);
                 Ok(())
             },
         )