Revert "feat(tui): overhaul latency sparkline scaling, color, and layout"

This reverts commit 63926e2932.

internal/tui/braille.go

@@ -1,103 +0,0 @@
-package tui
-
-// braillePlane is a subpixel canvas where each terminal cell maps to a 2×4
-// dot grid, rendered via Unicode braille (U+2800..U+28FF).
-type braillePlane struct {
-	wCells, hCells int
-	wDots, hDots   int
-	dots           []bool
-}
-
-func newBraillePlane(wCells, hCells int) *braillePlane {
-	wd, hd := wCells*2, hCells*4
-	return &braillePlane{
-		wCells: wCells, hCells: hCells,
-		wDots: wd, hDots: hd,
-		dots: make([]bool, wd*hd),
-	}
-}
-
-func (p *braillePlane) set(dx, dy int) {
-	if dx < 0 || dy < 0 || dx >= p.wDots || dy >= p.hDots {
-		return
-	}
-	p.dots[dy*p.wDots+dx] = true
-}
-
-// line draws a Bresenham line between two dot coordinates.
-func (p *braillePlane) line(x0, y0, x1, y1 int) {
-	dx := intAbs(x1 - x0)
-	sx := 1
-	if x0 >= x1 {
-		sx = -1
-	}
-	dy := -intAbs(y1 - y0)
-	sy := 1
-	if y0 >= y1 {
-		sy = -1
-	}
-	err := dx + dy
-	for {
-		p.set(x0, y0)
-		if x0 == x1 && y0 == y1 {
-			return
-		}
-		e2 := 2 * err
-		if e2 >= dy {
-			err += dy
-			x0 += sx
-		}
-		if e2 <= dx {
-			err += dx
-			y0 += sy
-		}
-	}
-}
-
-// fillBelow fills all dots below the topmost lit dot in each column,
-// producing an area-chart effect.
-func (p *braillePlane) fillBelow() {
-	for x := 0; x < p.wDots; x++ {
-		topY := -1
-		for y := 0; y < p.hDots; y++ {
-			if p.dots[y*p.wDots+x] {
-				topY = y
-				break
-			}
-		}
-		if topY >= 0 {
-			for y := topY + 1; y < p.hDots; y++ {
-				p.dots[y*p.wDots+x] = true
-			}
-		}
-	}
-}
-
-// cellMask builds the U+2800-relative bitmask for one terminal cell.
-func (p *braillePlane) cellMask(cx, cy int) byte {
-	type bit struct {
-		dx, dy int
-		m      byte
-	}
-	bits := [...]bit{
-		{0, 0, 0x01}, {0, 1, 0x02}, {0, 2, 0x04},
-		{1, 0, 0x08}, {1, 1, 0x10}, {1, 2, 0x20},
-		{0, 3, 0x40}, {1, 3, 0x80},
-	}
-	var mask byte
-	for _, b := range bits {
-		dx := cx*2 + b.dx
-		dy := cy*4 + b.dy
-		if dx >= 0 && dx < p.wDots && dy >= 0 && dy < p.hDots && p.dots[dy*p.wDots+dx] {
-			mask |= b.m
-		}
-	}
-	return mask
-}
-
-func intAbs(n int) int {
-	if n < 0 {
-		return -n
-	}
-	return n
-}