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/templates/out_app.html

@@ -64,7 +64,7 @@
 
   <div class="buttons">
     <button type="submit" class="button is-primary">{{.Submit}}</button>
-    {{if .Recalc}}<button type="submit" class="button" formaction="{{.Recalc}}">Recalculate rate limit</button>{{end}}
+    {{if .Recalc}}<button type="submit" class="button" formaction="{{.Recalc}}" data-unsaved="Recalculating leaves this page, and what you changed on it and did not save is lost. Recalculate anyway?">Recalculate rate limit</button>{{end}}
     <a class="button is-text" href="{{.Cancel}}">Cancel</a>
   </div>
 </form>

internal/web/view/templates/out_domain_settings.html

@@ -66,7 +66,7 @@
 </form>
 <div class="buttons">
   <button type="submit" class="button is-primary" form="rate-limit">Save limit</button>
-  {{if .Rate.Auto}}<form method="post" action="{{.RecalcAction}}"><button type="submit" class="button">Recalculate now</button></form>{{end}}
+  {{if .Rate.Auto}}<form method="post" action="{{.RecalcAction}}"><button type="submit" class="button" data-unsaved="Recalculating leaves this page, and what you changed on it and did not save is lost. Recalculate anyway?">Recalculate now</button></form>{{end}}
   {{if .Rate.Active}}<form method="post" action="{{.LimitAction}}" data-confirm="Remove the domain rate limit? Only the global level-1 limit will apply."><input type="hidden" name="clear" value="1"><button type="submit" class="button is-danger is-light">Remove limit</button></form>{{end}}
 </div>
 <p class="sp-muted mt-4">{{template "inline" .LimitNote}}</p>