merge: hoàn tất merge origin/feature/teamhoa/r05-r06 vào feature/delta-team/epic-R04

Resolve 3 file conflict:
- docs/refactor/Refactoring_Checklist.md: giữ nội dung incoming (phía HEAD
  trống ở đoạn conflict).
- tests/integration/test_routing_surfaces.py: khôi phục từ incoming (bị mất
  ở merge trước đó), điều chỉnh lại cho khớp API hiện tại của
  RoutingApplicationService (resolve()/RouteEvaluation/mode_resolver thay vì
  route_turn()/mode_reader cũ), bỏ 2 test pin một lớp RoutingDecision không
  còn tồn tại trên nhánh này.
- ui/folder_tab.py: chấp nhận xoá (deleted by them) — đã được thay thế hoàn
  toàn bởi presentation/folder/* (R08-T12), không còn nơi nào import module
  cũ.

Sửa thêm 2 chỗ lệch API bị auto-merge không báo conflict (phát hiện khi chạy
lại test):
- presentation/folder/ai_edit_model_resolver.py + ai_file_editor_dialog.py:
  AiEditModelResolver.apply_routing() gọi route_turn() đã bị xoá khỏi
  RoutingApplicationService — chuyển sang build_routing_application_service()
  .resolve(RoutingRequest(...)) giống chat_panel.py/co4e_chat.py; sửa luôn
  chữ ký _confirm_routing_switch nhận thêm timeout cho khớp contract confirm
  mới.
- config.py: import JsonConfigRepository ở đầu file gây circular import với
  core/tasks.py (cần CONFIG_DIR) qua chuỗi mới
  infrastructure/persistence/json/task_repository_impl.py (R07). Dời import
  xuống ngay trước chỗ dùng đầu tiên.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

application/monitoring/__init__.py

@@ -1 +1,18 @@
-"""Application monitoring package: Monitoring query service for audit and metrics."""
+"""Read-only query services for monitoring/dashboard screens (EPIC R08).
+
+⚠️ Ownership note (R08-T13): per ``docs/refactor/Feature_Architecture_
+Proposal.md``'s file-split diagram, ``dashboard_query_service.py`` lives
+under ``application/monitoring/`` alongside the Dashboard split — but the
+SAME document's "Ranh giới phân hệ" table assigns ``application/monitoring/``
+to Team Nam (R08-T07→T10, Monitoring's own 8-tab split). This directory did
+not exist yet when Team Hoa reached R08-T13, so creating it here does not
+collide with any file Team Nam has written — same situation R06-T02 flagged
+for ``infrastructure/persistence/json/atomic_write.py`` vs. Team Nam's
+planned ``atomic_json_file.py``. Team Nam should confirm when they start
+R08-T07→T10 whether ``DashboardQueryService`` belongs here permanently or
+should move once Monitoring's own query service exists.
+"""
+
+from .dashboard_query_service import DashboardQueryService
+
+__all__ = ["DashboardQueryService"]

application/monitoring/dashboard_query_service.py

@@ -0,0 +1,110 @@
+"""DashboardQueryService - read-only usage/cost queries for the Dashboard
+screen (R08-T13, extracted from ``ui/dashboard_tab.py::DashboardTab``, lines
+196-199/256-261/284-322 of the original 437-line file: ``_pricing``,
+``_period_range``'s date-math, and the ``period_totals``/``period_breakdown``
+calls ``_refresh_chart`` made directly).
+
+``ui/dashboard_tab.py`` called ``core/usage_tracker.py``/``core/model_
+pricing.py`` directly from FIVE different methods spread across what is now
+three widgets (``token_usage_card_widget.py``, ``usage_chart_widget.py``,
+``habits_widget.py``) — each recomputing the same merged pricing dict. This
+service is the one place that merge happens now; the three widgets share it
+instead of each calling ``core.usage_tracker``/``core.model_pricing`` on
+their own.
+
+Pure Python: no Qt. Wraps ``core/usage_tracker.py`` (a plain-Python module
+already) rather than reimplementing any of its date/cost math.
+"""
+from __future__ import annotations
+
+from datetime import date, timedelta
+from typing import Any, Dict, List, Tuple
+
+
+class DashboardQueryService:
+    """Usage/cost queries scoped to one ``AppContext``.
+
+    Args:
+        ctx: ``AppContext`` — read for ``ctx.config`` (pricing table,
+            currency, budget) and nothing else; this class does no I/O of
+            its own beyond what ``core.usage_tracker`` already does.
+    """
+
+    def __init__(self, ctx: Any) -> None:
+        self.ctx = ctx
+
+    def pricing(self) -> Dict[str, Any]:
+        """The merged price table (defaults + user overrides), synced from
+        Monitoring's model-pricing table first so cost figures always agree
+        between the two screens."""
+        from cowork_local.core import model_pricing as mp
+        from cowork_local.core import usage_tracker as ut
+
+        mp.sync_to_usage(self.ctx.config)
+        return {**ut.DEFAULT_PRICING, **(self.ctx.config.data.get("usage") or {})}
+
+    def period_range(self, granularity: str, offset: int) -> Tuple[date, date]:
+        """The SELECTED period as an inclusive ``(start, end)`` date range —
+        drives every widget on the screen (cards, chart, habits)."""
+        from cowork_local.core import usage_tracker as ut
+
+        start, end = ut.period_bounds(granularity, offset)
+        return start, end - timedelta(days=1)   # load_events end is inclusive
+
+    def summary(self, start: date, end: date) -> Dict[str, Any]:
+        """Everything the stat cards + habits panel need for one period:
+        the raw events, ``usage_tracker.summarize``'s aggregate stats, the
+        per-bucket costs, and their total — computed once so both widgets
+        read the same numbers instead of loading events twice."""
+        from cowork_local.core import usage_tracker as ut
+
+        events = ut.load_events(start, end)
+        pricing = self.pricing()
+        stats = ut.summarize(events)
+        costs = ut.cost_usd_events(events, pricing)
+        return {
+            "events": events,
+            "pricing": pricing,
+            "stats": stats,
+            "costs": costs,
+            "total_cost": sum(costs.values()),
+        }
+
+    def chart_series(self, granularity: str, offset: int, metric: str
+                     ) -> List[Tuple[str, float]]:
+        """``(label, value)`` points for the spline chart — WEEK -> 7 days,
+        MONTH -> weeks, YEAR -> 12 months, in whichever ``metric``
+        ("tokens" | "cost") was selected."""
+        from cowork_local.core import usage_tracker as ut
+
+        events = ut.load_events()   # all events; breakdown slices by period
+        pricing = self.pricing()
+        parts = ut.period_breakdown(events, granularity, pricing, offset=offset)
+        mi = 0 if metric == "tokens" else 1   # (label, tokens, cost) -> +1 for the value
+        return [(row[0], float(row[mi + 1])) for row in parts]
+
+    def period_totals(self, granularity: str, offset: int) -> Tuple[float, float]:
+        """``(tokens, cost)`` totals for one period — used to compute the
+        vs-previous-period delta the chart's reference line shows."""
+        from cowork_local.core import usage_tracker as ut
+
+        events = ut.load_events()
+        return ut.period_totals(events, granularity, self.pricing(), offset)
+
+    def period_range_label(self, granularity: str, offset: int) -> str:
+        from cowork_local.core import usage_tracker as ut
+
+        return ut.period_range_label(granularity, offset)
+
+    def budget_status(self):
+        from cowork_local.core import usage_tracker as ut
+
+        return ut.budget_status(self.ctx.config)
+
+    def set_budget(self, amount: float, currency: str) -> None:
+        from cowork_local.core import usage_tracker as ut
+
+        ut.set_budget(self.ctx.config, amount, currency)
+
+
+__all__ = ["DashboardQueryService"]