命名审查与垃圾代码清理（纯重命名 / 死代码删除，无行为变更）

前提：加载完成后全部采样都已驻留内存，程序此后与源文件再无联系。
据此修正了一批会让人误以为"仍在读写文件"的命名：

- SampleFileAt → SampleSignalAt（取的是内存信号在给定时刻的采样值）。
- DataSet::AddPreparedFile → AddDataFile。
- PlotView::InvalidatePolylineCache → InvalidateDerivedCaches
  （它同时清空折线、边沿统计、中心平均值曲线、静态场景缓存与悬停引用）。
- PlotView::CursorColor(int which) → CursorColor()（两条光标同色，参数从未使用）。
- UiEllipsize(g,…) → UiEllipsize(…)：纯测量不绘制，删掉被忽略的绘图上下文参数；
  同时删除与 UiMeasureTextWidth 完全重复的 UiTextWidth，调用点统一到 UiMeasureTextWidth。

清理残留参数（(void)xxx;）：
- TabConfig 的可见性/网格族（SetVisible / ToggleVisible / SetFileVisible / SetAllVisible /
  SoloSignal / SetMode / SyncLanes / FileHasVisible / FileAllVisible）去掉从未使用的
  const DataSet& 参数（仅 SyncToDataSet 真正需要数据层，保留）。
- PlotView::OnLButtonUp(int y)、OnMouseWheel(int delta, bool shift)；PainterSignalHalo 去掉未用的 ref。
- BuildDataFile 中未使用的局部 rowCount。

删除无人调用的死函数：
  DataSet::Clear / AddFromTable；SignalColorCount；WideToUtf8 / StartsWith；
  PlotView::ViewMinTime / ViewMaxTime / EdgePanelRect / EdgePanelCloseRect /
  EdgeCenterPanelRect / ScaleLaneRange / BeginLaneValueEdit / LaneContentHeight；
  SignalPanel::NeedsScrollBar / IsFilterEditing / FilterText / ContentHeight；
  PopupMenu::EditingItemId；TabBar::IsDragging；TextEdit::PlaceCaret。

删除只写不读的死字段：CsvTable::sourceRowCount（与 rowCount 等义）与 skippedRowCount。

以 VERY_BIG_DATA.CSV 回归验证：加载与勾选、筛选框（含"无匹配的筛选信号"）、
样式区线宽文案省略、选区放大（横向与纵向）、双光标读数与 Δt、右键菜单（Y 轴数值与
实验性功能子菜单）、合并/拆分网格、标签与信号重命名省略号，行为均与改动前一致；
make clean && make all 无任何警告。

Components/PlotView/Src/PlotView.cpp

@@ -363,7 +363,7 @@ namespace jdi
 		m_hoverLane = -1;
 		m_dragMode = PlotDragMode::NONE;
 		// 重新绑定数据源后旧的几何键不再有意义，必须清空折线缓存。
-		InvalidatePolylineCache();
+		InvalidateDerivedCaches();
 		InvalidateSceneCache();
 		RefreshLanes();
 	}
@@ -389,16 +389,6 @@ namespace jdi
 		return Tab().CursorMode();
 	}
 
-	double PlotView::ViewMinTime() const
-	{
-		return Tab().ViewMin();
-	}
-
-	double PlotView::ViewMaxTime() const
-	{
-		return Tab().ViewMax();
-	}
-
 	bool PlotView::HasDrawableContent() const
 	{
 		return (m_dataSet != nullptr) && !m_dataSet->Empty() && (m_tab != nullptr) && m_tab->AnyVisible();
@@ -899,10 +889,9 @@ namespace jdi
 		}
 	}
 
-	std::uint32_t PlotView::CursorColor(int which) const
+	std::uint32_t PlotView::CursorColor() const
 	{
-		// 两条光标统一使用同一样式与颜色（与光标 1 一致），不再按序号区分配色。
-		(void)which;
+		// 两条光标统一使用同一样式与颜色，不按序号区分配色。
 		if (m_theme == nullptr)
 		{
 			return 0xFF000000u;
@@ -952,7 +941,7 @@ namespace jdi
 		return true;
 	}
 
-	void PlotView::InvalidatePolylineCache()
+	void PlotView::InvalidateDerivedCaches()
 	{
 		m_polylineCache.clear();
 		// 数据层结构变化后边沿统计与中心平均值曲线的派生结果都会失效。
@@ -2080,37 +2069,6 @@ namespace jdi
 		}
 	}
 
-	void PlotView::ScaleLaneRange(int laneIndex, double factor, double anchorValue)
-	{
-		if (m_tab == nullptr || laneIndex < 0 || laneIndex >= static_cast<int>(m_lanes.size()))
-		{
-			return;
-		}
-		if (!(factor > 0.0) || !std::isfinite(anchorValue))
-		{
-			return;
-		}
-
-		const LaneVisual& visual = m_lanes[static_cast<std::size_t>(laneIndex)];
-		const double span = visual.yMax - visual.yMin;
-		if (!(span > 0.0))
-		{
-			return;
-		}
-
-		const double magnitude = std::max(std::fabs(visual.yMax), std::fabs(visual.yMin));
-		const double minSpan = std::max(magnitude * 1.0e-9, 1.0e-12);
-		const double newSpan = ClampDouble(span / factor, minSpan, magnitude * 100.0 + 1.0);
-		const double ratio = (visual.yMax - anchorValue) / span;
-
-		Lane& lane = m_tab->Lanes()[static_cast<std::size_t>(laneIndex)];
-		lane.autoRange = false;
-		lane.fitYToSelection = false;
-		lane.yMin = anchorValue - ratio * newSpan;
-		lane.yMax = lane.yMin + newSpan;
-		BuildLaneVisuals();
-	}
-
 	void PlotView::ShiftLaneRange(int laneIndex, double deltaValue)
 	{
 		if (m_tab == nullptr || laneIndex < 0 || laneIndex >= static_cast<int>(m_lanes.size()) ||
@@ -2135,27 +2093,6 @@ namespace jdi
 		BuildLaneVisuals();
 	}
 
-	bool PlotView::BeginLaneValueEdit(int laneIndex, bool editMax, const gd::RectF& anchorRect)
-	{
-		if (m_tab == nullptr || laneIndex < 0 || laneIndex >= static_cast<int>(m_tab->Lanes().size()))
-		{
-			return false;
-		}
-		if (m_lanes.empty())
-		{
-			BuildLaneVisuals();
-		}
-		if (laneIndex >= static_cast<int>(m_lanes.size()))
-		{
-			return false;
-		}
-
-		const LaneVisual& visual = m_lanes[static_cast<std::size_t>(laneIndex)];
-		const double current = editMax ? visual.yMax : visual.yMin;
-		return BeginEdit(editMax ? PlotEditTarget::LANE_Y_MAX : PlotEditTarget::LANE_Y_MIN, laneIndex,
-		                 FormatValue(current), anchorRect);
-	}
-
 	bool PlotView::ApplyLaneValueText(int laneIndex, bool editMax, const std::wstring& text)
 	{
 		if (m_tab == nullptr || laneIndex < 0 || laneIndex >= static_cast<int>(m_tab->Lanes().size()))
@@ -3468,8 +3405,9 @@ namespace jdi
 		return changed;
 	}
 
-	bool PlotView::OnLButtonUp(int x, int y)
-	{		bool changed = (m_dragMode != PlotDragMode::NONE);
+	bool PlotView::OnLButtonUp(int y)
+	{
+		bool changed = (m_dragMode != PlotDragMode::NONE);
 
 		switch (m_dragMode)
 		{
@@ -3528,11 +3466,10 @@ namespace jdi
 		m_edgePanelDragKind = EdgePanelKind::COUNT;
 		// 松开左键：粘滞提示结束计时，开始"停留后淡出"。
 		ReleaseHint();
-		(void)x;
 		return changed;
 	}
 
-	bool PlotView::OnMouseWheel(int x, int y, int delta, bool shift)
+	bool PlotView::OnMouseWheel(int delta, bool shift)
 	{
 		if (!HasDrawableContent() || delta == 0)
 		{
@@ -3559,8 +3496,6 @@ namespace jdi
 
 		Tab().LaneScroll() -= static_cast<float>(notches * 48.0 * m_scale);
 		BuildLaneVisuals();
-		(void)x;
-		(void)y;
 		return true;
 	}
 
@@ -4125,7 +4060,7 @@ namespace jdi
 		g.DrawRectangle(&borderPen, m_plotRect.X, m_plotRect.Y, m_plotRect.Width, m_plotRect.Height);
 	}
 
-	void PlotView::PaintSignalHalo(gd::Graphics& g, const SignalRef& ref, const ResolvedSignal& resolved,
+	void PlotView::PaintSignalHalo(gd::Graphics& g, const ResolvedSignal& resolved,
 	                               const std::vector<gd::PointF>& points,
 	                               const std::vector<std::size_t>& breaks)
 	{
@@ -4133,8 +4068,6 @@ namespace jdi
 		if (!drawLine || breaks.empty())
 		{
 			// 散点模式没有光晕（原实现同样只对折线绘制光晕）。
-			(void)g;
-			(void)ref;
 			return;
 		}
 
@@ -4194,7 +4127,7 @@ namespace jdi
 					const PolylineCacheEntry* cached = AcquirePolyline(m_hoverSignal, resolved, lane);
 					if (cached != nullptr)
 					{
-						PaintSignalHalo(g, m_hoverSignal, resolved, cached->points, cached->breaks);
+						PaintSignalHalo(g, resolved, cached->points, cached->breaks);
 					}
 				}
 			}
@@ -4534,7 +4467,7 @@ namespace jdi
 			return;
 		}
 
-		const float textWidth = UiTextWidth(g, text, m_fonts->monoSmall) + 12.0f * m_scale;
+		const float textWidth = UiMeasureTextWidth(m_fonts->monoSmall, text) + 12.0f * m_scale;
 		const float textHeight = 18.0f * m_scale;
 		float labelX = m_rubberRect.X + m_rubberRect.Width * 0.5f - textWidth * 0.5f;
 		labelX = std::max(m_plotRect.X, std::min(labelX, m_plotRect.X + m_plotRect.Width - textWidth));
@@ -4568,7 +4501,7 @@ namespace jdi
 		// 提示条贴在绘图区底部居中；时间光标的时间读数也在底部，
 		// 因此光标启用时把提示条上移一行，避免两者互相遮挡。
 		const float reserved = (m_tab != nullptr && Tab().CursorEnabled()) ? 26.0f * m_scale : 0.0f;
-		const float width = UiTextWidth(g, m_hintText, m_fonts->ui) + 30.0f * m_scale;
+		const float width = UiMeasureTextWidth(m_fonts->ui, m_hintText) + 30.0f * m_scale;
 		const float height = 30.0f * m_scale;
 		float left = m_plotRect.X + (m_plotRect.Width - width) * 0.5f;
 		left = std::max(m_plotRect.X + 2.0f * m_scale,
@@ -4731,7 +4664,7 @@ namespace jdi
 				const bool highlighted = (ref == haloRef);
 				if (highlighted)
 				{
-					PaintSignalHalo(g, ref, resolved, points, breaks);
+					PaintSignalHalo(g, resolved, points, breaks);
 				}
 
 				if (drawLine && !breaks.empty())
@@ -4892,7 +4825,7 @@ namespace jdi
 				}
 
 				UiFillRoundRect(g, pill, 3.0f * m_scale, WithAlpha(m_theme->cardBg, 0xF0));
-				const std::wstring text = UiEllipsize(g, raw, m_fonts->monoSmall, pill.Width - 6.0f * m_scale);
+				const std::wstring text = UiEllipsize(raw, m_fonts->monoSmall, pill.Width - 6.0f * m_scale);
 				UiText(g, text, m_fonts->monoSmall,
 				       gd::RectF(pill.X + 4.0f * m_scale, pill.Y, pill.Width - 8.0f * m_scale, pill.Height),
 				       (tick == 0.0) ? m_theme->text : m_theme->textMuted, TextAlign::LEFT);
@@ -4972,7 +4905,7 @@ namespace jdi
 				label += L" · " + resolved.file->Title();
 			}
 			const float itemWidth = kLegendSwatchSize * m_scale + 5.0f * m_scale +
-			                        std::min(UiTextWidth(g, label, m_fonts->uiSmall),
+			                        std::min(UiMeasureTextWidth(m_fonts->uiSmall, label),
 			                                 kLegendMaxTextWidth * m_scale) +
 			                        kLegendItemGap * m_scale;
 			if (cursorX + legendWidth + itemWidth > maxX)
@@ -5027,10 +4960,10 @@ namespace jdi
 			}
 			// 文本宽度按上限夹取，超出部分用省略号（与测量阶段保持一致）。
 			const float maxTextWidth = kLegendMaxTextWidth * m_scale;
-			const float fullTextWidth = UiTextWidth(g, label, m_fonts->uiSmall);
+			const float fullTextWidth = UiMeasureTextWidth(m_fonts->uiSmall, label);
 			const float textWidth = std::min(fullTextWidth, maxTextWidth);
 			const std::wstring drawLabel =
-			    (fullTextWidth > maxTextWidth) ? UiEllipsize(g, label, m_fonts->uiSmall, maxTextWidth) : label;
+			    (fullTextWidth > maxTextWidth) ? UiEllipsize(label, m_fonts->uiSmall, maxTextWidth) : label;
 			const float itemWidth = kLegendSwatchSize * m_scale + 5.0f * m_scale + textWidth +
 			                        kLegendItemGap * m_scale;
 			if (drawnWidth + itemWidth > legendWidth + 0.5f)
@@ -5114,7 +5047,7 @@ namespace jdi
 		{
 			for (std::size_t fileIndex = 0; fileIndex < m_dataSet->FileCount(); ++fileIndex)
 			{
-				if (!m_tab->FileHasVisible(*m_dataSet, static_cast<int>(fileIndex)))
+				if (!m_tab->FileHasVisible(static_cast<int>(fileIndex)))
 				{
 					continue;
 				}
@@ -5138,7 +5071,7 @@ namespace jdi
 		             m_plotRect.Width * 0.4f);
 		const gd::RectF nameRect(m_plotRect.X + 2.0f * m_scale, axisY + 3.0f * m_scale, nameWidth,
 		                         std::max(0.0f, m_timeAxisRect.Height - 5.0f * m_scale));
-		UiText(g, UiEllipsize(g, axisName, m_fonts->monoSmall, nameWidth), m_fonts->monoSmall, nameRect,
+		UiText(g, UiEllipsize(axisName, m_fonts->monoSmall, nameWidth), m_fonts->monoSmall, nameRect,
 		       m_theme->textMuted, TextAlign::LEFT);
 
 		const float labelWidth = 96.0f * m_scale;
@@ -5295,7 +5228,7 @@ namespace jdi
 			}
 
 			const bool hot = (m_hoverCursor == which);
-			const std::uint32_t color = CursorColor(which);
+			const std::uint32_t color = CursorColor();
 			const float lineTop = m_plotRect.Y;
 			const float lineBottom = m_timeAxisRect.Y + m_timeAxisRect.Height;
 			UiDrawLine(g, x, lineTop, x, lineBottom, color, (hot ? 2.0f : 1.4f) * m_scale);
@@ -5346,7 +5279,7 @@ namespace jdi
 
 					const bool interpolate = (resolved.style->mode != DrawMode::SCATTER);
 					double value = 0.0;
-					if (!SampleFileAt(*resolved.file, *resolved.data, time, interpolate, value))
+					if (!SampleSignalAt(*resolved.file, *resolved.data, time, interpolate, value))
 					{
 						continue;
 					}
@@ -5368,7 +5301,7 @@ namespace jdi
 					if (showDelta)
 					{
 						double otherValue = 0.0;
-						if (SampleFileAt(*resolved.file, *resolved.data, otherTime, interpolate, otherValue))
+						if (SampleSignalAt(*resolved.file, *resolved.data, otherTime, interpolate, otherValue))
 						{
 							const double delta = value - otherValue;
 							// 增量 = 右侧光标取值 − 左侧光标取值，包在圆括号里并按差值显式给出正负号。
@@ -5379,7 +5312,7 @@ namespace jdi
 						}
 					}
 
-					const float textWidth = UiTextWidth(g, text, m_fonts->monoSmall) + 10.0f * m_scale;
+					const float textWidth = UiMeasureTextWidth(m_fonts->monoSmall, text) + 10.0f * m_scale;
 					const float textHeight = 17.0f * m_scale;
 					float labelLeft = pinX + radius + 4.0f * m_scale;
 					if (labelLeft + textWidth > m_plotRect.X + m_plotRect.Width - 2.0f * m_scale)
@@ -5454,7 +5387,7 @@ namespace jdi
 						centerText += L"）";
 
 						const float centerTextWidth =
-						    UiTextWidth(g, centerText, m_fonts->monoSmall) + 10.0f * m_scale;
+						    UiMeasureTextWidth(m_fonts->monoSmall, centerText) + 10.0f * m_scale;
 						float centerLeft = pinX + radius + 4.0f * m_scale;
 						if (centerLeft + centerTextWidth >
 						    m_plotRect.X + m_plotRect.Width - 2.0f * m_scale)
@@ -5507,7 +5440,7 @@ namespace jdi
 				continue;
 			}
 			const bool highlighted = (m_cursorHover && m_hoverCursor == which);
-			const std::uint32_t color = CursorColor(which);
+			const std::uint32_t color = CursorColor();
 			UiFillRoundRect(g, labelRect, 3.0f * m_scale,
 			                highlighted ? color : WithAlpha(color, 0xE0));
 			const bool dark = IsDarkColor(color);
@@ -5526,7 +5459,7 @@ namespace jdi
 			if (spanRect.Width > 0.0f && spanRect.Height > 0.0f)
 			{
 				// 样式与光标时间读数完全一致（同底色/同描边/同文字配色）。
-				const std::uint32_t color = CursorColor(1);
+				const std::uint32_t color = CursorColor();
 				UiFillRoundRect(g, spanRect, 3.0f * m_scale,
 				                m_spanHover ? color : WithAlpha(color, 0xE0));
 				const bool dark = IsDarkColor(color);
@@ -5628,21 +5561,6 @@ namespace jdi
 		return layout;
 	}
 
-	gd::RectF PlotView::EdgePanelRect(int laneIndex) const
-	{
-		return EdgePanelLayoutFor(laneIndex, EdgePanelKind::COUNT).panel;
-	}
-
-	gd::RectF PlotView::EdgePanelCloseRect(int laneIndex) const
-	{
-		return EdgePanelLayoutFor(laneIndex, EdgePanelKind::COUNT).close;
-	}
-
-	gd::RectF PlotView::EdgeCenterPanelRect(int laneIndex) const
-	{
-		return EdgePanelLayoutFor(laneIndex, EdgePanelKind::CENTER).panel;
-	}
-
 	bool PlotView::IsOnEdgeCursorLine(int x, int y, int& laneIndex) const
 	{
 		laneIndex = -1;
@@ -5934,7 +5852,7 @@ namespace jdi
 
 		std::vector<Lane>& tabLanes = m_tab->Lanes();
 		const std::size_t count = std::min(lanes.size(), tabLanes.size());
-		const std::uint32_t color = CursorColor(1);
+		const std::uint32_t color = CursorColor();
 		const bool dark = IsDarkColor(color);
 
 		// ---- 横向光标（线与两端把手 + 左侧幅值读数）----
@@ -6334,7 +6252,7 @@ namespace jdi
 					                              ? std::wstring(L"松开左键放回本网格")
 					                              : (L"移动到网格 " + std::to_wstring(target + 1) +
 					                                 L"：松开左键确认");
-					const float textWidth = UiTextWidth(g, hint, m_fonts->uiSmall) + 16.0f * m_scale;
+					const float textWidth = UiMeasureTextWidth(m_fonts->uiSmall, hint) + 16.0f * m_scale;
 					const float height = 20.0f * m_scale;
 					float left = targetRect.X + (targetRect.Width - textWidth) * 0.5f;
 					left = std::max(m_plotRect.X, std::min(left, m_plotRect.X + m_plotRect.Width - textWidth));
@@ -6373,7 +6291,7 @@ namespace jdi
 		const std::wstring text = resolved.data->Title() + L" · 按住拖拽可移入其它网格";
 
 		// 提示跟随鼠标：在可拖拽区域内持续移动时，提示条也要跟着走。
-		const float textWidth = UiTextWidth(g, text, m_fonts->uiSmall) + 16.0f * m_scale;
+		const float textWidth = UiMeasureTextWidth(m_fonts->uiSmall, text) + 16.0f * m_scale;
 		const float height = 20.0f * m_scale;
 		float left = static_cast<float>(m_mouseX) + 12.0f * m_scale;
 		if (left + textWidth > m_plotRect.X + m_plotRect.Width)