web: Referrer-Policy same-origin; a password shown once emptied on pagehide

D-B3. Fetch Standard § 3.2 "append a request `Origin` header": under
Referrer-Policy no-referrer a request that is not GET/HEAD and not CORS -
a form POST, a navigation - gets Origin "null". originAllowed() refuses
"null" whenever Sec-Fetch-Site is absent, and Fetch Metadata § 3 sends
Sec-Fetch-Site only to a potentially trustworthy URL: every form,
sign-in included, failed in Safari before 16.4 and in any browser on a
plain-HTTP panel at a name. same-origin nulls Origin only for a request
not same origin with its URL and still sends no referrer to another
site. The comments of the origin check say so.

D-B13. noStore keeps the page out of HTTP caches (RFC 9111 § 5.2.2.5);
a history mechanism "might honor" it (§ 6), and Pragma in a response
"was never specified" (§ 5.4) - it goes. CopyField.Secret marks the
password of out-app-created data-secret, and panel.js empties such
fields on pagehide (HTML § 7.5.9, "unload a Document", step 10.2: fired
whether or not the document is kept for history traversal).

Measured 2026-10-15 in Chrome 152 (the desktop app's browser), a local
probe page with Cache-Control: no-store and a data-secret field: Back
reloads it (pageshow persisted=false, a new load), so this browser keeps
no-store pages out of its back/forward cache; the handler, fired on the
same page, empties the field. Firefox and Safari not measured.

Tests: the header value; the created page has the password data-secret
and the login not, no Pragma. Stand (2026-10-15, make e2e, exit 0): new
form_post_with_the_browsers_origin - Referrer-Policy: same-origin on a
page; a POST carrying the page's own Origin and no Sec-Fetch-Site, what
a browser sends now, passes; one carrying Origin: null, what it sent
before, is 403. (A first run failed where the e2e client and a view test
scraped the old input markup; both read data-secret now.) go vet and go
test ./... pass on the server (24 packages).

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

test/e2e/panel_client.go

@@ -264,7 +264,7 @@ func (c *panelClient) applicationID(domainID, login string) (string, error) {
 // before returning.
 func extractCodeRow(body, label string) (string, bool) {
 	pattern := `<label class="label">` + regexp.QuoteMeta(label) + `</label>\s*<div class="field has-addons"><div class="control is-expanded">` +
-		`(?:<input class="input" readonly value="([^"]*)">|<textarea class="textarea" rows="\d+" readonly>([^<]*)</textarea>)`
+		`(?:<input class="input" readonly value="([^"]*)"(?: data-secret)?>|<textarea class="textarea" rows="\d+" readonly(?: data-secret)?>([^<]*)</textarea>)`
 	m := regexp.MustCompile(pattern).FindStringSubmatch(body)
 	if m == nil {
 		return "", false