Keep zoomed K-line bar count same as thumbnail window.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/static/js/charts.js

@@ -1,7 +1,7 @@
 /** 复盘四周期：进出场落在包含时刻的 K 线；点击可放大 */
 (function () {
   var TF_MAX = { M1: 500, M5: 200, M15: 100, H1: 50 };
-  var TF_ZOOM = { M1: 90, M5: 48, M15: 32, H1: 20 };
+  // 放大只把画布变大，根数与缩略图同一窗口（不再额外收紧）
   var TF_SEC = { M1: 60, M5: 300, M15: 900, H1: 3600 };
 
   function num(v) {
@@ -268,7 +268,7 @@
       '<span class="chart-lightbox-title"></span>' +
       '<button type="button" class="chart-lightbox-close" aria-label="关闭">×</button>' +
       "</div>" +
-      '<p class="muted chart-lightbox-hint">围绕进出场收紧显示 · Esc / 点击遮罩关闭</p>' +
+      '<p class="muted chart-lightbox-hint">与缩略图同窗口放大 · Esc / 点击遮罩关闭</p>' +
       '<canvas class="chart-lightbox-canvas"></canvas>' +
       "</div>";
     document.body.appendChild(box);
@@ -319,7 +319,7 @@
           JSON.parse(canvas.dataset.bars || "[]"),
           markers,
           tf,
-          { zoom: true, maxN: TF_ZOOM[tf] || 60 }
+          { zoom: true, maxN: TF_MAX[tf] || 100 }
         );
       } catch (e) {
         console.warn(e);
@@ -346,7 +346,7 @@
             JSON.parse(canvas.dataset.bars || "[]"),
             readMarkers(canvas),
             canvas.dataset.tf || "M1",
-            { zoom: true, maxN: TF_ZOOM[canvas.dataset.tf] || 60 }
+            { zoom: true, maxN: TF_MAX[canvas.dataset.tf] || 100 }
           );
         } catch (err) {
           /* ignore */

app/templates/record_detail.html

@@ -82,7 +82,7 @@
   <h3>四周期 K 线（M1 / M5 / M15 / H1）</h3>
   <p class="muted">
     方向 <span class="tag {{ side_cls }}">{{ side_cn }}</span> ·
-    入/出落在<strong>包含成交时刻</strong>的 K 线 · <strong>点击图可放大</strong>（放大时围绕进出场收紧）。
+    入/出落在<strong>包含成交时刻</strong>的 K 线 · <strong>点击图可放大</strong>（同窗口放大看清）。
     <span style="color:#4cc2ff">● 入场 {{ trade.open_price|fmt_price }}{% if trade.open_time_fmt %} · {{ trade.open_time_fmt }}{% endif %}</span>
     {% if trade.close_price is not none %}
     · <span style="color:#f0b429">● 出场 {{ trade.close_price|fmt_price }}{% if trade.close_time_fmt %} · {{ trade.close_time_fmt }}{% endif %}</span>