feat(desktop): polish desktop shell and shared WebUI surfaces (#4195)

* feat(desktop): add native host scaffold

* feat(webui): track turns and usage in gateway

* feat(webui): polish desktop chat experience

* feat(apps): add ArcGIS and Joplin logos

* feat(desktop): polish shell and shared surfaces

* fix(webui): avoid preview chips for glob references

* test: align CI expectations for token fallback

* feat(webui): preview prompt rail entries

* feat(webui): add prompt navigator drawer

* style(webui): refine prompt navigator placement

* style(webui): align prompt navigator with header actions

* style(webui): simplify prompt navigator header

* refactor(webui): clean thread resource refresh

* feat(desktop): add native reply notifications

* fix(webui): preserve desktop restart and replay state

* fix(desktop): harden gateway proxy startup

* fix(web): fall back when readability is unavailable

* fix(desktop): hide window instead of closing on macos

* fix(webui): unify desktop header actions

* fix(webui): simplify prompt history rows

* fix(desktop): log notification delivery failures

* chore(desktop): clean source package artifacts

* fix(cron): support one-time relative reminders

* fix(webui): reveal scroll button in place

* Revert "fix(cron): support one-time relative reminders"

This reverts commit 4c4661da12.

* refactor(webui): extract token usage heatmap

* docs(desktop): clarify contributor guides

---------

Co-authored-by: chengyongru <2755839590@qq.com>

tests/cli/test_restart_command.py

@@ -214,8 +214,16 @@ class TestRestartCommand:
         assert "Tasks: 3 active" in response.content
 
     @pytest.mark.asyncio
-    async def test_run_agent_loop_resets_usage_when_provider_omits_it(self):
+    async def test_run_agent_loop_estimates_usage_when_provider_omits_it(self, monkeypatch):
         loop, _bus = _make_loop()
+        monkeypatch.setattr(
+            "nanobot.agent.runner.estimate_prompt_tokens_chain",
+            lambda *_args, **_kwargs: (123, "test"),
+        )
+        monkeypatch.setattr(
+            "nanobot.agent.runner.estimate_message_tokens",
+            lambda _message: 7,
+        )
         loop.provider.chat_with_retry = AsyncMock(side_effect=[
             LLMResponse(content="first", usage={"prompt_tokens": 9, "completion_tokens": 4}),
             LLMResponse(content="second", usage={}),
@@ -226,8 +234,9 @@ class TestRestartCommand:
         assert loop._last_usage["completion_tokens"] == 4
 
         await loop._run_agent_loop([])
-        assert loop._last_usage["prompt_tokens"] == 0
-        assert loop._last_usage["completion_tokens"] == 0
+        assert loop._last_usage["prompt_tokens"] == 123
+        assert loop._last_usage["completion_tokens"] == 7
+        assert loop._last_usage["estimated_tokens"] == 130
 
     @pytest.mark.asyncio
     async def test_status_falls_back_to_last_usage_when_context_estimate_missing(self):