fix(glass): ease navbar optical sliders for default readability

src/components/theme/__tests__/GlassNavbarRefractionDefs.spec.ts

@@ -168,7 +168,7 @@ describe('GlassNavbarRefractionDefs', () => {
     effectiveSettings.value = { glassDeformationStrength: 48, glassTranslationStrength: 48 }
     await settle()
     expect(createGlassNavbarDisplacementMap).toHaveBeenLastCalledWith(
-      expect.objectContaining({ optics: expect.objectContaining({ translationPx: 8.16 }) }),
+      expect.objectContaining({ optics: expect.objectContaining({ translationPx: expect.closeTo(1.880064) }) }),
     )
   })
 

src/utils/__tests__/glassNavbarRefraction.spec.ts

@@ -6,20 +6,28 @@ import {
 } from '@/utils/glassNavbarRefraction'
 
 describe('getGlassNavbarOpticalResponse', () => {
-  it('keeps default vertical deformation small while retaining substantial translation', () => {
+  it('prioritizes default reading while retaining the horizontal lens', () => {
     const optics = getGlassNavbarOpticalResponse({ deformation: 48, translation: 48 })
-    expect(optics.translationPx).toBeCloseTo(8.16)
-    expect(optics.verticalRatio * 24).toBeLessThan(0.4)
-    expect(optics.horizontalRatio * 24).toBeGreaterThan(3)
+    expect(optics.translationPx).toBeCloseTo(1.880064)
+    expect(optics.verticalRatio * 24).toBeLessThan(0.02)
+    expect(optics.horizontalRatio * 24).toBeGreaterThan(2.9)
   })
   it.each([
     [0, 0],
-    [50, 8.5],
-    [99, 16.83],
+    [50, 2.125],
+    [80, 8.704],
+    [99, 16.495083],
     [100, 17],
-  ])('maps translation %s linearly to %s pixels', (translation, pixels) => {
+  ])('maps translation %s to the readable curve at %s pixels', (translation, pixels) => {
     expect(getGlassNavbarOpticalResponse({ deformation: 48, translation }).translationPx).toBeCloseTo(pixels)
   })
+  it('keeps the midpoint deformation equivalent to the original 12.5% input', () => {
+    const parameters = Object.freeze({ deformation: 50, translation: 50 })
+    const optics = getGlassNavbarOpticalResponse(parameters)
+    expect(optics.horizontalRatio).toBeCloseTo(0.1386328125)
+    expect(optics.verticalRatio).toBeCloseTo(0.000859375)
+    expect(parameters).toEqual({ deformation: 50, translation: 50 })
+  })
   it('separates translation from deformation and limits the maximum translation', () => {
     expect(getGlassNavbarOpticalResponse({ deformation: 0, translation: 100 })).toEqual({
       horizontalRatio: 0,

src/utils/glassNavbarRefraction.ts

@@ -36,16 +36,16 @@ export interface GlassNavbarOpticalResponse {
   translationPx: number
 }
 
-/** 自然默认值即呈现明显短边折射；纵向形变与平移独立限幅以保护阅读。 */
+/** 导航以低中段可读性为优先，高段保留完整位移预算；不改写共享参数或材质响应。 */
 export function getGlassNavbarOpticalResponse(
   parameters: Pick<GlassOpticalParameters, 'deformation' | 'translation'>,
 ): GlassNavbarOpticalResponse {
-  const deformation = normalizeGlassOpticalStrength(parameters.deformation) / 100
-  const translation = normalizeGlassOpticalStrength(parameters.translation) / 100
+  // 两个滑杆分别映射，50% 均使用 12.5% 的光学输入，避免平移维持高强度而抵消阅读改善。
+  const deformation = (normalizeGlassOpticalStrength(parameters.deformation) / 100) ** 3
+  const translation = (normalizeGlassOpticalStrength(parameters.translation) / 100) ** 3
   return {
     horizontalRatio: 0.42 * (1 - (1 - deformation) ** 3),
     verticalRatio: 0.055 * deformation ** 2,
-    // 平移使用线性刻度，50% 对应 8.5px；不把平移强度叠加到字形纵向缩放。
     translationPx: 17 * translation,
   }
 }