fix: 样式区线宽行改为按可用宽度等比自适应，面板收窄时不再溢出

- 线宽行先按设计尺寸排布，仅在可用宽度不足时整体等比缩小，
  面板默认宽度下保持原有比例（数值框不会被拉宽变形），最窄宽度下也不会溢出面板。
- 面板极窄时数值框自动省略 "px" 单位、仅显示数值，避免出现被截断的省略号。

Components/SignalPanel/Src/SignalPanel.cpp

@@ -482,33 +482,35 @@ namespace jdi
 		              swatchSize, swatchSize);
 
 		// ---- 第二行：线宽（最细 / 数值旋钮 / 最粗）----
-		const float presetWidth = kWidthPresetWidth * m_scale;
+		// 先按设计尺寸排布，仅在可用宽度不足时整体等比缩小，保证不溢出也不被拉伸变形。
-		const float spinButton = kWidthSpinButton * m_scale;
-		const float valueWidth = kWidthValueWidth * m_scale;
-		float groupGap = 8.0f * m_scale;
-
-		float spinnerWidth = spinButton * 2.0f + valueWidth;
-		float groupWidth = presetWidth * 2.0f + spinnerWidth + groupGap * 2.0f;
-		if (groupWidth > contentWidth)
-		{
-			const float fit = contentWidth / groupWidth;
-			groupGap = std::max(3.0f * m_scale, groupGap * fit);
-			spinnerWidth = std::max(spinButton * 2.0f + 36.0f * m_scale, spinnerWidth * fit);
-			groupWidth = std::min(contentWidth, presetWidth * 2.0f + spinnerWidth + groupGap * 2.0f);
-		}
-
 		const float row1Top = row0Top + (kStyleRowHeight + kStyleRowGap) * m_scale;
+		const float naturalGap = 8.0f * m_scale;
+		const float naturalPreset = kWidthPresetWidth * m_scale;
+		const float naturalSpinner = (kWidthSpinButton * 2.0f + kWidthValueWidth) * m_scale;
+
+		const float naturalTotal = naturalPreset * 2.0f + naturalSpinner + naturalGap * 2.0f;
+		const float widthFactor =
+		    (naturalTotal > contentWidth && naturalTotal > 0.0f) ? (contentWidth / naturalTotal) : 1.0f;
+
+		const float presetWidth = naturalPreset * widthFactor;
+		const float spinnerWidth = naturalSpinner * widthFactor;
+		const float rowGap = std::max(2.0f * m_scale, naturalGap * widthFactor);
+
+		const float spinButtonWidth = std::min(kWidthSpinButton * m_scale, spinnerWidth * 0.26f);
+		const float innerValueWidth = std::max(12.0f * m_scale, spinnerWidth - spinButtonWidth * 2.0f);
+
+		const float groupWidth = presetWidth * 2.0f + spinnerWidth + rowGap * 2.0f;
 		const float groupLeft = contentLeft + std::max(0.0f, (contentWidth - groupWidth) * 0.5f);
-		const float innerSpinButton = std::min(spinButton, spinnerWidth * 0.25f);
-		const float innerValueWidth = std::max(24.0f * m_scale, spinnerWidth - innerSpinButton * 2.0f);
 
 		m_widthThinRect = gd::RectF(groupLeft, row1Top, presetWidth, rowHeight);
-		m_widthSpinnerRect = gd::RectF(groupLeft + presetWidth + groupGap, row1Top, spinnerWidth, rowHeight);
+		m_widthSpinnerRect = gd::RectF(groupLeft + presetWidth + rowGap, row1Top, spinnerWidth, rowHeight);
-		m_widthMinusRect = gd::RectF(m_widthSpinnerRect.X, row1Top, innerSpinButton, rowHeight);
+		m_widthMinusRect = gd::RectF(m_widthSpinnerRect.X, row1Top, spinButtonWidth, rowHeight);
-		m_widthValueRect = gd::RectF(m_widthMinusRect.X + innerSpinButton, row1Top, innerValueWidth, rowHeight);
+		m_widthValueRect =
-		m_widthPlusRect = gd::RectF(m_widthValueRect.X + innerValueWidth, row1Top, innerSpinButton, rowHeight);
+		    gd::RectF(m_widthMinusRect.X + spinButtonWidth, row1Top, innerValueWidth, rowHeight);
+		m_widthPlusRect =
+		    gd::RectF(m_widthValueRect.X + innerValueWidth, row1Top, spinButtonWidth, rowHeight);
 		m_widthThickRect =
-		    gd::RectF(m_widthSpinnerRect.X + spinnerWidth + groupGap, row1Top, presetWidth, rowHeight);
+		    gd::RectF(m_widthSpinnerRect.X + spinnerWidth + rowGap, row1Top, presetWidth, rowHeight);
 
 		// ---- 第三行：样式（线段 / 散点 / 点线）----
 		const float row2Top = row1Top + (kStyleRowHeight + kStyleRowGap) * m_scale;
@@ -930,10 +932,16 @@ namespace jdi
 			{
 				const std::wstring editText =
 				    m_widthEditText.empty() ? std::wstring(L" ") : m_widthEditText;
-				const float textWidth = UiTextWidth(g, editText, m_fonts->monoSmall);
+				// 面板极窄时省略单位，保证数值本身完整可读。
+				const std::wstring fullText = editText + L" px";
+				const std::wstring shown =
+				    (UiTextWidth(g, fullText, m_fonts->monoSmall) > m_widthValueRect.Width - 6.0f * m_scale)
+				        ? editText
+				        : fullText;
+				const float textWidth = UiTextWidth(g, shown, m_fonts->monoSmall);
 				const float caretX =
 				    m_widthValueRect.X + m_widthValueRect.Width - 6.0f * m_scale - textWidth;
-				UiText(g, editText + L" px", m_fonts->monoSmall, m_widthValueRect, m_theme->textStrong,
+				UiText(g, shown, m_fonts->monoSmall, m_widthValueRect, m_theme->textStrong,
 				       TextAlign::RIGHT);
 				if (caretX > m_widthValueRect.X)
 				{
@@ -944,8 +952,14 @@ namespace jdi
 			}
 			else
 			{
-				UiText(g, FormatNumber(style->lineWidth, 1) + L" px", m_fonts->monoSmall, m_widthValueRect,
+				const std::wstring numberText = FormatNumber(style->lineWidth, 1);
-				       m_theme->textStrong, TextAlign::CENTER);
+				const std::wstring fullText = numberText + L" px";
+				const std::wstring shown =
+				    (UiTextWidth(g, fullText, m_fonts->monoSmall) > m_widthValueRect.Width - 6.0f * m_scale)
+				        ? numberText
+				        : fullText;
+				UiText(g, shown, m_fonts->monoSmall, m_widthValueRect, m_theme->textStrong,
+				       TextAlign::CENTER);
 			}
 
 			const bool minusHot = (m_hoverStyle == StyleHit::WIDTH_MINUS);