fix(web): scope dashboard config Reset button to the current tab (#16813)

* Port from Kilo-Org/kilocode#9448: roll up subagent costs into parent session total

Child subagents built by delegate_task() each track their own
session_estimated_cost_usd, but the parent agent's total never folded
those numbers in.  On runs where the parent mostly delegates and the
children do the expensive work, the footer/UI was reporting a fraction
of the actual spend — sometimes $0.00 when the parent itself made no
billed calls.

Fix:
- Capture each child's session_estimated_cost_usd into _child_cost_usd
  on the result entry (before child.close() drops the counter).
- After the existing subagent_stop hook loop, sum the children's costs
  and add the total to parent.session_estimated_cost_usd.
- Promote session_cost_source from 'none' -> 'subagent' when the parent
  had no direct spend but children did, so the UI doesn't label the
  total as having unknown provenance.  Real sources (openrouter,
  anthropic, etc.) are preserved.

Nested orchestrator -> worker trees roll up naturally: each layer's own
delegate_task() folds its direct children in, and when the orchestrator
itself returns, its parent folds the orchestrator's now-inflated total
on top.

Internal fields (_child_cost_usd, _child_role) are stripped from the
results dict before it's serialised back to the model — same contract
as _child_role already followed.

Tests: TestSubagentCostRollup (5 cases) covers single-child, batch,
zero-cost-children, preserved-source, and legacy-fixture paths.

Source: https://github.com/Kilo-Org/kilocode/pull/9448

* fix(web): scope dashboard config Reset button to the current tab

Reported by @ykmfb001 via X: clicking 'Restore Defaults' (恢复默认值) on
the Auxiliary page wiped the entire config.yaml to defaults, not just
the auxiliary section. The button sits next to the category tabs and
users reasonably assumed 'reset this tab', not 'reset everything'.

Changes:
- handleReset now scopes to the fields in the current view:
  active category's fields (form mode) or search-matched fields
  (search mode). Only those keys are copied from defaults; the rest
  of the config is left alone.
- Added a window.confirm() with the scope name before applying.
- Button is hidden in YAML mode (scoping doesn't apply there).
- Tooltip/aria-label now name the scope, e.g. 'Reset Auxiliary to
  defaults'.
- i18n: new resetScopeTooltip / confirmResetScope / resetScopeToast
  strings in en + zh; resetDefaults key preserved for compat.

tests/tools/test_delegate.py

@@ -568,6 +568,163 @@ class TestDelegateObservability(unittest.TestCase):
             self.assertEqual(result["results"][0]["exit_reason"], "max_iterations")
 
 
+class TestSubagentCostRollup(unittest.TestCase):
+    """Port of Kilo-Org/kilocode#9448 — parent's session_estimated_cost_usd
+    must include subagent spend, not just the parent's own API calls."""
+
+    def _make_parent_with_cost_counters(self, depth=0, starting_cost=0.0):
+        parent = _make_mock_parent(depth=depth)
+        # The fields AIAgent exposes and the footer reads from.  Set real
+        # floats/strings so the rollup can add to them rather than tripping
+        # on MagicMock auto-attrs.
+        parent.session_estimated_cost_usd = starting_cost
+        parent.session_cost_status = "unknown"
+        parent.session_cost_source = "none"
+        return parent
+
+    def test_single_child_cost_folded_into_parent(self):
+        parent = self._make_parent_with_cost_counters(starting_cost=0.10)
+
+        with patch("run_agent.AIAgent") as MockAgent:
+            mock_child = MagicMock()
+            mock_child.model = "claude-sonnet-4-6"
+            mock_child.session_prompt_tokens = 1000
+            mock_child.session_completion_tokens = 200
+            mock_child.session_estimated_cost_usd = 0.42
+            mock_child.run_conversation.return_value = {
+                "final_response": "done",
+                "completed": True,
+                "interrupted": False,
+                "api_calls": 2,
+                "messages": [],
+            }
+            MockAgent.return_value = mock_child
+
+            result = json.loads(delegate_task(goal="do stuff", parent_agent=parent))
+
+        # Parent footer must reflect parent_cost + child_cost.
+        self.assertAlmostEqual(parent.session_estimated_cost_usd, 0.52, places=6)
+        # Rollup must strip the internal field before serialising to the model.
+        self.assertNotIn("_child_cost_usd", result["results"][0])
+        self.assertNotIn("_child_role", result["results"][0])
+
+    def test_batch_children_costs_sum_into_parent(self):
+        parent = self._make_parent_with_cost_counters(starting_cost=0.00)
+
+        with patch("tools.delegate_tool._run_single_child") as mock_run:
+            mock_run.side_effect = [
+                {
+                    "task_index": 0,
+                    "status": "completed",
+                    "summary": "A",
+                    "api_calls": 2,
+                    "duration_seconds": 1.0,
+                    "_child_role": "leaf",
+                    "_child_cost_usd": 0.15,
+                },
+                {
+                    "task_index": 1,
+                    "status": "completed",
+                    "summary": "B",
+                    "api_calls": 2,
+                    "duration_seconds": 1.0,
+                    "_child_role": "leaf",
+                    "_child_cost_usd": 0.27,
+                },
+                {
+                    "task_index": 2,
+                    "status": "failed",
+                    "summary": "",
+                    "error": "boom",
+                    "api_calls": 0,
+                    "duration_seconds": 0.1,
+                    "_child_role": "leaf",
+                    "_child_cost_usd": 0.03,
+                },
+            ]
+            result = json.loads(
+                delegate_task(
+                    tasks=[{"goal": "A"}, {"goal": "B"}, {"goal": "C"}],
+                    parent_agent=parent,
+                )
+            )
+
+        # 0.15 + 0.27 + 0.03 even though one child failed — the API calls it
+        # made before failing still cost money.
+        self.assertAlmostEqual(parent.session_estimated_cost_usd, 0.45, places=6)
+        # cost_source promoted from "none" since the parent had no direct spend.
+        self.assertEqual(parent.session_cost_source, "subagent")
+        self.assertEqual(parent.session_cost_status, "estimated")
+        # All internal fields stripped from results.
+        for entry in result["results"]:
+            self.assertNotIn("_child_cost_usd", entry)
+            self.assertNotIn("_child_role", entry)
+
+    def test_zero_cost_children_leave_parent_source_untouched(self):
+        """If every child reports 0 cost (e.g. free local model), we should
+        not invent a fake 'subagent' source — the parent's 'none' stays."""
+        parent = self._make_parent_with_cost_counters(starting_cost=0.00)
+
+        with patch("tools.delegate_tool._run_single_child") as mock_run:
+            mock_run.return_value = {
+                "task_index": 0,
+                "status": "completed",
+                "summary": "done",
+                "api_calls": 1,
+                "duration_seconds": 0.5,
+                "_child_role": "leaf",
+                "_child_cost_usd": 0.0,
+            }
+            delegate_task(goal="free local run", parent_agent=parent)
+
+        self.assertEqual(parent.session_estimated_cost_usd, 0.0)
+        self.assertEqual(parent.session_cost_source, "none")
+
+    def test_parent_with_real_source_not_overwritten(self):
+        """If the parent already has its own cost billed (cost_source != 'none'),
+        adding subagent cost must not clobber the existing source label."""
+        parent = self._make_parent_with_cost_counters(starting_cost=0.20)
+        parent.session_cost_status = "exact"
+        parent.session_cost_source = "openrouter"
+
+        with patch("tools.delegate_tool._run_single_child") as mock_run:
+            mock_run.return_value = {
+                "task_index": 0,
+                "status": "completed",
+                "summary": "done",
+                "api_calls": 1,
+                "duration_seconds": 0.5,
+                "_child_role": "leaf",
+                "_child_cost_usd": 0.30,
+            }
+            delegate_task(goal="billed run", parent_agent=parent)
+
+        self.assertAlmostEqual(parent.session_estimated_cost_usd, 0.50, places=6)
+        # Real source label preserved.
+        self.assertEqual(parent.session_cost_source, "openrouter")
+        self.assertEqual(parent.session_cost_status, "exact")
+
+    def test_rollup_tolerates_missing_cost_fields(self):
+        """Older fixtures / fabricated error entries may not carry
+        _child_cost_usd.  Rollup must degrade to zero-add silently."""
+        parent = self._make_parent_with_cost_counters(starting_cost=0.10)
+
+        with patch("tools.delegate_tool._run_single_child") as mock_run:
+            mock_run.return_value = {
+                "task_index": 0,
+                "status": "completed",
+                "summary": "done",
+                "api_calls": 1,
+                "duration_seconds": 0.5,
+                # no _child_role, no _child_cost_usd
+            }
+            result = json.loads(delegate_task(goal="legacy", parent_agent=parent))
+
+        # Parent cost unchanged.
+        self.assertEqual(parent.session_estimated_cost_usd, 0.10)
+        self.assertEqual(len(result["results"]), 1)
+
+
 class TestBlockedTools(unittest.TestCase):
     def test_blocked_tools_constant(self):
         for tool in ["delegate_task", "clarify", "memory", "send_message", "execute_code"]: