refactor(pages): 抽取时间选择策略为 TimeSelectMaker，将 Overlay 基类更名为 Dialog

将 findBestTimeOption 中的预约/续约双分支逻辑抽象为策略模式：
- TimeOptionReader 负责从 WebElement 提取时间数据（ReserveTimeReader / RenewTimeReader）
- TimeDecisionMaker 执行纯决策算法，零 Selenium 依赖
- TimeSelectMaker 作为工厂统一创建配置好的决策器
- 共享常量 LIBRARY_CLOSE_MINS 统一收敛至 TimeSelectMaker

同时将 Overlay 基类重命名为 Dialog，SeatMapOverlay 同步更名为 SeatMapDialog，保持命名一致性。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/pages/components/SeatMapDialog.py

@@ -0,0 +1,80 @@
+# -*- coding: utf-8 -*-
+"""
+Copyright (c) 2026 KenanZhu.
+All rights reserved.
+
+This software is provided "as is", without any warranty of any kind.
+You may use, modify, and distribute this file under the terms of the MIT License.
+See the LICENSE file for details.
+"""
+from selenium.common.exceptions import (
+    ElementNotInteractableException,
+    NoSuchElementException,
+    StaleElementReferenceException,
+    TimeoutException,
+)
+from selenium.webdriver.common.by import By
+from selenium.webdriver.remote.webdriver import WebDriver
+from selenium.webdriver.support.ui import WebDriverWait
+from selenium.webdriver.support import expected_conditions as EC
+
+from pages.components.Dialog import Dialog
+
+
+class SeatMapDialog(Dialog):
+    """
+        Seat selection overlay that opens after choosing a floor and room.
+    """
+
+    ROOT       = (By.ID, "seatLayout")
+    SEAT_ITEMS = (By.CSS_SELECTOR, "li[id^='seat_']")
+
+    def __init__(
+        self,
+        driver: WebDriver,
+    ) -> None:
+
+        super().__init__(driver, self.ROOT)
+
+    def selectSeat(
+        self,
+        seat_id: str,
+    ) -> str | None:
+
+        try:
+            self._waitAllPresence(self.SEAT_ITEMS)
+        except (NoSuchElementException, TimeoutException):
+            return None
+        except Exception:
+            return None
+        try:
+            seat_el = self._find(By.ID, f"seat_{int(seat_id):03d}")
+            seat_link = seat_el.find_element(By.TAG_NAME, "a")
+            WebDriverWait(self._driver, 2).until(
+                EC.element_to_be_clickable(seat_link)
+            )
+            seat_link.click()
+            return seat_link.get_attribute("title")
+        except (NoSuchElementException, ValueError, TimeoutException,
+                ElementNotInteractableException, StaleElementReferenceException):
+            pass
+        except Exception:
+            pass
+        try:
+            all_seats = self._findAll(*self.SEAT_ITEMS)
+            seat_id_upper = seat_id.lstrip('0').upper()
+            for seat in all_seats:
+                if not seat_id_upper == seat.text.lstrip('0'):
+                    continue
+                seat_link = seat.find_element(By.TAG_NAME, "a")
+                WebDriverWait(self._driver, 2).until(
+                    EC.element_to_be_clickable(seat_link)
+                )
+                seat_link.click()
+                return seat_link.get_attribute("title")
+            return None
+        except (NoSuchElementException, TimeoutException,
+                ElementNotInteractableException, StaleElementReferenceException):
+            return None
+        except Exception:
+            return None