audit 4: log paging at its edges, NaN refused, a red rate limit, recalculation asks, reload writes all

Step 4 of stage 4 (L10, L11, L13, L18, L19 and a row of
review-2026-08-followups):

- The Outbound log counts first and clamps the page to the last; a number
  too large for an int (strconv's ErrRange with the largest int) is the
  last page on both logs. Tested at the edges: first, last, past the last
  however far, nonsense, an empty log asked for page 5.
- checkAutoMultiplier is "not within", so NaN and the infinities are out.
- rate-limited is red (components.go; the mockup first, 643892a).
- data-unsaved on both recalculate buttons: panel.js asks on submit
  (ev.submitter) when a field of the page differs from what it was drawn
  with; testdata/unsaved_test.js under TestPanelJS.
- HandleReload writes what a restore's first start writes - the filter
  lists and the DMARC maps too - and a failed step is an error flash on
  Health that names it, not plain text; the success flash says what was
  written.

Tested on the test server: go vet + go test of 25 packages, make e2e (all
pass, 695 s) on this tree.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/web/view/paneljs_test.go

@@ -6,17 +6,23 @@ import (
 	"testing"
 )
 
-// The refreshes of the monitoring boxes survive a failure and back off,
-// checked by running panel.js in node against a stand-in for the DOM and
-// htmx (testdata/poll_test.js; audit 2026-10-12, M11). Skipped where node is
-// not installed - the test server's Go has none; the workstation runs it.
-func TestPanelJSPolling(t *testing.T) {
+// panel.js run in node against a stand-in for the parts of the DOM and htmx
+// it uses (testdata/*_test.js): the refreshes of the monitoring boxes
+// survive a failure and back off (audit 2026-10-12, M11), and a button that
+// leaves the page asks first when a field holds an unsaved edit (L19).
+// Skipped where node is not installed - the test server's Go has none; the
+// workstation runs it.
+func TestPanelJS(t *testing.T) {
 	node, err := exec.LookPath("node")
 	if err != nil {
 		t.Skip("node is not installed")
 	}
-	out, err := exec.Command(node, filepath.Join("testdata", "poll_test.js"), filepath.Join("static", "panel.js")).CombinedOutput()
-	if err != nil {
-		t.Fatalf("panel.js polling: %v\n%s", err, out)
+	for _, script := range []string{"poll_test.js", "unsaved_test.js"} {
+		t.Run(script, func(t *testing.T) {
+			out, err := exec.Command(node, filepath.Join("testdata", script), filepath.Join("static", "panel.js")).CombinedOutput()
+			if err != nil {
+				t.Fatalf("%v\n%s", err, out)
+			}
+		})
 	}
 }