fix(tree): 自绘清晰复选框(明暗都可见) + 选中整行连续(去碎片框)

- 多余选中框: 全局 QTreeView::item 去掉 border-radius+margin → 选中是整行连续一条, 不再浮动碎块
- light 复选框看不清: Fusion 原生复选框浅底边框过淡。writeCheckboxIcon 自绘 PNG
  (未选=明显边框空心框, 选中=强调色底+白勾), 明暗各一套, 经 QTreeView::indicator QSS 引用,
  主题切换重绘 → 明暗都清晰

src/app/Glyphs.cpp

@@ -158,6 +158,47 @@ QString writeChevronIcon(bool open, const QColor& color)
     return path;
 }
 
+QString writeCheckboxIcon(bool checked, const QColor& border, const QColor& fill, const QColor& check,
+                          const QString& tag)
+{
+    constexpr int px = 16;
+    constexpr int kScale = 3;
+    QPixmap pm(px * kScale, px * kScale);
+    pm.fill(Qt::transparent);
+
+    QPainter p(&pm);
+    p.setRenderHint(QPainter::Antialiasing, true);
+    const double s = px * kScale;
+    const double inset = s * 0.14;
+    const QRectF box(inset, inset, s - 2 * inset, s - 2 * inset);
+    const double r = s * 0.14;
+
+    if (checked) {
+        p.setPen(Qt::NoPen);
+        p.setBrush(fill);
+        p.drawRoundedRect(box, r, r);
+        QPen cpen(check, s * 0.12);
+        cpen.setCapStyle(Qt::RoundCap);
+        cpen.setJoinStyle(Qt::RoundJoin);
+        p.setPen(cpen);
+        p.drawLine(QPointF(s * 0.30, s * 0.52), QPointF(s * 0.44, s * 0.66));
+        p.drawLine(QPointF(s * 0.44, s * 0.66), QPointF(s * 0.70, s * 0.34));
+    } else {
+        QPen bpen(border, s * 0.085);
+        p.setPen(bpen);
+        p.setBrush(fill);
+        p.drawRoundedRect(box, r, r);
+    }
+    p.end();
+
+    const QString path = QDir(QDir::tempPath())
+                             .filePath(QStringLiteral("geopro_chk_%1_%2.png")
+                                           .arg(tag, checked ? QStringLiteral("on")
+                                                             : QStringLiteral("off")));
+    pm.save(path, "PNG");
+    return path;
+}
+
 namespace {
 // 当前主题下的 chrome 图标色：取主题主文本色（暗=浅、亮=深），保证两种模式都清晰。
 QColor themedIconColor()

src/app/Glyphs.hpp

@@ -46,4 +46,9 @@ void setThemedGlyph(QAbstractButton* button, Glyph type, int px);
 // 配合 QTreeView::branch 背景使用，可让选中高亮不覆盖左侧缩进/箭头列且不丢箭头。
 QString writeChevronIcon(bool open, const QColor& color);
 
+// 生成清晰复选框 PNG（供 QTreeView::indicator 的 QSS `image:url(...)`）：
+// 未选=明显边框空心方框；选中=填充色方框 + 白色对勾。明暗各传一套色，tag 区分文件名。
+QString writeCheckboxIcon(bool checked, const QColor& border, const QColor& fill, const QColor& check,
+                          const QString& tag);
+
 }  // namespace geopro::app

src/app/Theme.cpp

@@ -75,8 +75,6 @@ QTreeWidget, QListWidget, QTreeView, QListView {
 }
 QTreeWidget::item, QListWidget::item, QTreeView::item, QListView::item {
     padding: 4px 8px;
-    border-radius: 6px;
-    margin: 1px 4px;
 }
 QTreeWidget::item:hover, QListWidget::item:hover,
 QTreeView::item:hover, QListView::item:hover {

src/app/panels/ObjectTreePanel.cpp

@@ -6,6 +6,10 @@
 #include <QTreeWidgetItem>
 #include <QVBoxLayout>
 
+#include <ElaDef.h>
+#include <ElaTheme.h>
+
+#include "Glyphs.hpp"
 #include "Theme.hpp"
 #include "dto/NavDto.hpp"
 
@@ -38,6 +42,27 @@ ObjectTreePanel::ObjectTreePanel(QWidget* parent) : QWidget(parent) {
     tree_ = new QTreeWidget(this);
     tree_->setHeaderHidden(true);
     tree_->setIndentation(14);  // 收紧缩进
+
+    // 清晰复选框：自绘 PNG（未选=明显边框空心框，选中=强调色底+白勾），明暗各一套、切换重绘。
+    // 规避 Fusion 原生复选框在浅底下边框过淡、看不清的问题。
+    auto applyCheckboxStyle = [this]() {
+        const bool dark = geopro::app::isDarkTheme();
+        const QColor border = dark ? QColor(0x8A, 0x92, 0x9C) : QColor(0x8A, 0x93, 0xA3);
+        const QColor boxBg = dark ? QColor(0x2B, 0x2D, 0x30) : QColor(0xFF, 0xFF, 0xFF);
+        const QColor accent = eTheme->getThemeColor(
+            dark ? ElaThemeType::Dark : ElaThemeType::Light, ElaThemeType::PrimaryNormal);
+        const QString tag = dark ? QStringLiteral("d") : QStringLiteral("l");
+        const QString off = geopro::app::writeCheckboxIcon(false, border, boxBg, Qt::white, tag);
+        const QString on = geopro::app::writeCheckboxIcon(true, accent, accent, Qt::white, tag);
+        tree_->setStyleSheet(QStringLiteral("QTreeView::indicator{ width:16px; height:16px; }"
+                                            "QTreeView::indicator:unchecked{ image:url(%1); }"
+                                            "QTreeView::indicator:checked{ image:url(%2); }")
+                                 .arg(off, on));
+    };
+    applyCheckboxStyle();
+    QObject::connect(eTheme, &ElaTheme::themeModeChanged, tree_,
+                     [applyCheckboxStyle](ElaThemeType::ThemeMode) { applyCheckboxStyle(); });
+
     lay->addWidget(tree_, 1);
 
     hint_ = new QLabel(QStringLiteral("正在加载对象…"), this);