chore(v2): vendor dependencies for offline/China builds

go mod vendor pins onnxruntime_go v1.12.1, Gio and the rest into v2/vendor
so go run/build work without hitting proxy.golang.org (blocked/slow in
China). Verified: CGO_ENABLED=1 go build -mod=vendor ./internal/spike and
GOOS=windows go build -mod=vendor ./internal/ui both pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

v2/vendor/gioui.org/internal/f32/f32.go

@@ -0,0 +1,177 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+/*
+Package f32 is an internal version of the public package f32 with
+extra types for internal use.
+*/
+package f32
+
+import (
+	"image"
+	"math"
+
+	"gioui.org/f32"
+)
+
+type Point = f32.Point
+
+type Affine2D = f32.Affine2D
+
+var NewAffine2D = f32.NewAffine2D
+
+var AffineId = f32.AffineId
+
+// A Rectangle contains the points (X, Y) where Min.X <= X < Max.X,
+// Min.Y <= Y < Max.Y.
+type Rectangle struct {
+	Min, Max Point
+}
+
+// String return a string representation of r.
+func (r Rectangle) String() string {
+	return r.Min.String() + "-" + r.Max.String()
+}
+
+// Rect is a shorthand for Rectangle{Point{x0, y0}, Point{x1, y1}}.
+// The returned Rectangle has x0 and y0 swapped if necessary so that
+// it's correctly formed.
+func Rect(x0, y0, x1, y1 float32) Rectangle {
+	if x0 > x1 {
+		x0, x1 = x1, x0
+	}
+	if y0 > y1 {
+		y0, y1 = y1, y0
+	}
+	return Rectangle{Point{x0, y0}, Point{x1, y1}}
+}
+
+// Pt is shorthand for Point{X: x, Y: y}.
+var Pt = f32.Pt
+
+// Size returns r's width and height.
+func (r Rectangle) Size() Point {
+	return Point{X: r.Dx(), Y: r.Dy()}
+}
+
+// Dx returns r's width.
+func (r Rectangle) Dx() float32 {
+	return r.Max.X - r.Min.X
+}
+
+// Dy returns r's Height.
+func (r Rectangle) Dy() float32 {
+	return r.Max.Y - r.Min.Y
+}
+
+// Intersect returns the intersection of r and s.
+func (r Rectangle) Intersect(s Rectangle) Rectangle {
+	if r.Min.X < s.Min.X {
+		r.Min.X = s.Min.X
+	}
+	if r.Min.Y < s.Min.Y {
+		r.Min.Y = s.Min.Y
+	}
+	if r.Max.X > s.Max.X {
+		r.Max.X = s.Max.X
+	}
+	if r.Max.Y > s.Max.Y {
+		r.Max.Y = s.Max.Y
+	}
+	if r.Empty() {
+		return Rectangle{}
+	}
+	return r
+}
+
+// Union returns the union of r and s.
+func (r Rectangle) Union(s Rectangle) Rectangle {
+	if r.Empty() {
+		return s
+	}
+	if s.Empty() {
+		return r
+	}
+	if r.Min.X > s.Min.X {
+		r.Min.X = s.Min.X
+	}
+	if r.Min.Y > s.Min.Y {
+		r.Min.Y = s.Min.Y
+	}
+	if r.Max.X < s.Max.X {
+		r.Max.X = s.Max.X
+	}
+	if r.Max.Y < s.Max.Y {
+		r.Max.Y = s.Max.Y
+	}
+	return r
+}
+
+// Canon returns the canonical version of r, where Min is to
+// the upper left of Max.
+func (r Rectangle) Canon() Rectangle {
+	if r.Max.X < r.Min.X {
+		r.Min.X, r.Max.X = r.Max.X, r.Min.X
+	}
+	if r.Max.Y < r.Min.Y {
+		r.Min.Y, r.Max.Y = r.Max.Y, r.Min.Y
+	}
+	return r
+}
+
+// Empty reports whether r represents the empty area.
+func (r Rectangle) Empty() bool {
+	return r.Min.X >= r.Max.X || r.Min.Y >= r.Max.Y
+}
+
+// Add offsets r with the vector p.
+func (r Rectangle) Add(p Point) Rectangle {
+	return Rectangle{
+		Point{r.Min.X + p.X, r.Min.Y + p.Y},
+		Point{r.Max.X + p.X, r.Max.Y + p.Y},
+	}
+}
+
+// Sub offsets r with the vector -p.
+func (r Rectangle) Sub(p Point) Rectangle {
+	return Rectangle{
+		Point{r.Min.X - p.X, r.Min.Y - p.Y},
+		Point{r.Max.X - p.X, r.Max.Y - p.Y},
+	}
+}
+
+// Round returns the smallest integer rectangle that
+// contains r.
+func (r Rectangle) Round() image.Rectangle {
+	return image.Rectangle{
+		Min: image.Point{
+			X: int(floor(r.Min.X)),
+			Y: int(floor(r.Min.Y)),
+		},
+		Max: image.Point{
+			X: int(ceil(r.Max.X)),
+			Y: int(ceil(r.Max.Y)),
+		},
+	}
+}
+
+// fRect converts a rectangle to a f32internal.Rectangle.
+func FRect(r image.Rectangle) Rectangle {
+	return Rectangle{
+		Min: FPt(r.Min), Max: FPt(r.Max),
+	}
+}
+
+// Fpt converts an point to a f32.Point.
+func FPt(p image.Point) Point {
+	return Point{
+		X: float32(p.X), Y: float32(p.Y),
+	}
+}
+
+func ceil(v float32) int {
+	return int(math.Ceil(float64(v)))
+}
+
+func floor(v float32) int {
+	return int(math.Floor(float64(v)))
+}