✨ feat(tools): show app-fixed tools in the chat-input Pinned section (#15509)

* ✨ feat(tools): show app-fixed tools in the chat-input Pinned section

Surface always-on, runtime-owned tools (lobe-agent + always-on infra) read-only
at the top of the Tools popover "Pinned" group, so users can see what the app
keeps active for every conversation. These have no toggle — a Pin indicator with
a hint replaces the per-tool policy menu.

- builtin-tools: add `fixedDisplayToolIds` ([lobe-agent, ...alwaysOnToolIds])
- builtin selectors: add `fixedDisplayMetaList` (reads hidden tools by id)
- useControls: render read-only fixed items, prepend to Pinned, fold into counts
- i18n: add `tools.activation.fixed.hint` + `tools.builtins.lobe-agent.*`

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* 🐛 fix(tools): make lobe-agent actually always-on; gate fixed display to runtime

The Pinned section was rendering tools that aren't enabled every turn:
- lobe-agent was only enabled when injected into plugins/runtime ids (it has no
  rule in the engine, so it defaulted to disabled) — showing it as "always on"
  was a UI lie.
- manual skill-activate mode strips manualModeExcludeToolIds (activator,
  skill-store) from the defaults, so they're off — but they still showed as fixed.

Fixes:
- Add lobe-agent to alwaysOnToolIds so its core capabilities (plan/todo, sub-agent
  dispatch, visual-media fallback) are genuinely on every agent-mode turn. Chat
  mode still drops alwaysOn entirely.
- Derive fixedDisplayToolIds from alwaysOnToolIds (single source of truth, no drift).
- Make fixedDisplayMetaList mode-aware: drop manualModeExcludeToolIds in manual mode
  so the Pinned list matches what the engine actually enables.
- Update engine tests that asserted the old "lobe-agent off by default" behavior.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* ♻️ refactor(tools): drop fixedDisplayToolIds alias, use alwaysOnToolIds directly

fixedDisplayToolIds was just `= alwaysOnToolIds`; collapse it. The selector now
reads alwaysOnToolIds directly and still applies the manual-mode exclusion.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

locales/en-US/setting.json

@@ -1014,6 +1014,7 @@
   "tab.usage": "Usage",
   "tools.activation.auto": "Auto",
   "tools.activation.auto.desc": "Smart",
+  "tools.activation.fixed.hint": "Always on — managed by the app and can’t be turned off",
   "tools.activation.pinned": "Pinned",
   "tools.activation.pinned.desc": "Always On",
   "tools.add": "Add Skill",
@@ -1033,6 +1034,8 @@
   "tools.builtins.lobe-agent-documents.title": "Documents",
   "tools.builtins.lobe-agent-management.description": "Create, manage, and orchestrate AI agents",
   "tools.builtins.lobe-agent-management.title": "Agent Management",
+  "tools.builtins.lobe-agent.description": "Built-in Lobe Agent capabilities: plan and todo management, sub-agent dispatch, and visual media analysis",
+  "tools.builtins.lobe-agent.title": "Lobe Agent",
   "tools.builtins.lobe-artifacts.description": "Generate and preview interactive UI components and visualizations",
   "tools.builtins.lobe-artifacts.readme": "Generate and live-preview interactive UI components, data visualizations, charts, SVG graphics, and web applications. Create rich visual content that users can interact with directly.",
   "tools.builtins.lobe-artifacts.title": "Artifacts",

locales/zh-CN/setting.json

@@ -1015,6 +1015,7 @@
   "tab.usage": "用量",
   "tools.activation.auto": "自动",
   "tools.activation.auto.desc": "智能调用",
+  "tools.activation.fixed.hint": "由应用强制开启，始终可用，无法关闭",
   "tools.activation.pinned": "固定启用",
   "tools.activation.pinned.desc": "始终注入",
   "tools.add": "集成技能",
@@ -1034,6 +1035,8 @@
   "tools.builtins.lobe-agent-documents.title": "文档",
   "tools.builtins.lobe-agent-management.description": "创建、管理并编排 AI 助手",
   "tools.builtins.lobe-agent-management.title": "助手管理",
+  "tools.builtins.lobe-agent.description": "内置 Lobe Agent 能力：计划与待办管理、子助手调度、视觉媒体分析",
+  "tools.builtins.lobe-agent.title": "Lobe Agent",
   "tools.builtins.lobe-artifacts.description": "生成并预览交互式 UI 组件和可视化内容",
   "tools.builtins.lobe-artifacts.readme": "生成并实时预览交互式 UI 组件、数据可视化、图表、SVG 图形和 Web 应用。创建用户可直接交互的丰富可视化内容。",
   "tools.builtins.lobe-artifacts.title": "Artifacts",