Fix 32-bit build, add 386 to CI, log scan completion

.github/workflows/ci.yml

@@ -25,6 +25,6 @@ jobs:
       - name: cross-build
         if: runner.os == 'Linux'
         run: |
-          for t in linux/arm64 darwin/arm64 windows/amd64 freebsd/amd64; do
+          for t in linux/arm64 linux/386 darwin/arm64 windows/amd64 freebsd/amd64; do
             GOOS=${t%/*} GOARCH=${t#*/} CGO_ENABLED=0 go build -o /dev/null ./cmd/mapsize
           done

internal/scan/scan.go

@@ -11,6 +11,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"log/slog"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -358,6 +359,7 @@ func (c *controller) apply(r *result, cancelled bool) bool {
 			dn.Flags |= inventory.FlagIncomplete
 			t.Stats.Unscanned++
 		default:
+			slog.Debug("read directory failed", "path", j.path, "err", r.err)
 			dn.Flags |= inventory.FlagError | inventory.FlagIncomplete
 			t.Stats.AddError(inventory.ErrorRecord{Node: dir, Kind: inventory.Classify(r.err), Msg: errMsg(r.err)})
 			d.Errors++

internal/tui/color256.go

@@ -1,6 +1,9 @@
 package tui
 
-import "sync"
+import (
+	"math"
+	"sync"
+)
 
 // The stock 256-colour conversion maps dark, slightly tinted colours to
 // saturated cube entries (olive, navy), which wrecks the subtle shading the
@@ -24,7 +27,7 @@ func quant256(c Color) uint8 {
 		return v.(uint8)
 	}
 	r, g, b := int(c>>16&0xff), int(c>>8&0xff), int(c&0xff)
-	best, bestD := 16, 1<<62
+	best, bestD := 16, math.MaxInt
 	for i := 0; i < 216; i++ {
 		cr, cg, cb := cubeLevels[i/36], cubeLevels[i/6%6], cubeLevels[i%6]
 		if d := redmean(r, g, b, cr, cg, cb); d < bestD {

internal/tui/model.go

@@ -10,6 +10,7 @@ package tui
 import (
 	"context"
 	"fmt"
+	"log/slog"
 	"os"
 	"path/filepath"
 	"strings"
@@ -324,6 +325,8 @@ func (m *Model) scanFinished() tea.Cmd {
 	errs := st.TotalErrors()
 	el := st.Elapsed()
 	t.RUnlock()
+	slog.Info("scan finished", "files", files, "dirs", st.Dirs, "bytes", total, "errors", errs,
+		"cancelled", st.Cancelled, "elapsed", el)
 	var cmds []tea.Cmd
 	rate := float64(files+st.Dirs) / max(el.Seconds(), 0.001)
 	msg := fmt.Sprintf("✓ Scan complete  %s  ·  %s files  ·  %s dirs  ·  %s  ·  %s/s",