Key fields: keep the browser's password UI away, fix the keyboard layout

"Trying to use a different provider on the web app glitches out completely" -
an iPhone photo of the first-run gate with iOS's saved-password sheet laid
over it ("password for proxmox...") and the provider field stuck under the
keyboard.

- The key fields (gate, Settings, provider rows) were type=password with
  autocomplete=off, which iOS/Safari and 1Password/LastPass read as a login.
  They now carry autoComplete="new-password", data-form-type="other",
  data-lpignore="true", autoCorrect/autoCapitalize=off and inputMode=text:
  the mask stays, the password overlay goes. The custom base URL gets
  inputMode=url and the same hints.
- The gate's keyboard handling scrolled to the Continue button instead of the
  field being edited, so with the provider rows open the keyboard covered the
  input and the locked wrapper could not be scrolled to it. The wrapper is
  user-scrollable again, alignment anchors on the focused element (Continue
  is the fallback), and the corner controls hide while the keyboard is up
  rather than landing on the card.

providers-test drives a fake visualViewport (340px, installed before mount)
and pins the three layout contracts plus the hardening attributes. All 16
suites green, contrast clean. Version 0.7.2, SW v94.

components/ApiKeyGate.tsx

@@ -115,17 +115,22 @@ function GateScreen() {
     if (window.matchMedia("(pointer: fine)").matches) inputRef.current?.focus();
   }, []);
 
-  // Keep the field and the Continue button in view while the on-screen keyboard
-  // is up (the card itself is locked, so this is done by scrolling the wrapper
-  // programmatically rather than by the user).
+  // Keep what the listener is actually editing in view while the on-screen
+  // keyboard is up: the focused field when there is one (the provider rows sit
+  // far below the Continue button), the button otherwise. The wrapper stays
+  // user-scrollable underneath, this just does the first move.
   const alignKeyboard = useCallback(() => {
     const wrap = wrapRef.current;
-    const submit = submitRef.current;
-    if (!wrap || !submit) return;
+    if (!wrap) return;
+    const active = document.activeElement;
+    const focused =
+      active instanceof HTMLElement && active !== wrap && wrap.contains(active) ? active : null;
+    const target = focused ?? submitRef.current;
+    if (!target) return;
     const wrapBox = wrap.getBoundingClientRect();
-    const btnBox = submit.getBoundingClientRect();
-    const below = btnBox.bottom + 12 - wrapBox.bottom;
-    const above = wrapBox.top + 12 - btnBox.top;
+    const box = target.getBoundingClientRect();
+    const below = box.bottom + 12 - wrapBox.bottom;
+    const above = wrapBox.top + 12 - box.top;
     if (below > 0) wrap.scrollTop += below;
     else if (above > 0) wrap.scrollTop -= above;
   }, []);
@@ -205,7 +210,7 @@ function GateScreen() {
     >
       {/* corner controls: theme + help ---------------------------------- */}
       <div
-        className="absolute z-20 flex items-center gap-2"
+        className={cn("absolute z-20 flex items-center gap-2", keyboardOpen && "hidden")}
         style={{
           top: "max(env(safe-area-inset-top), 1.25rem)",
           right: "max(env(safe-area-inset-right), 1.25rem)",
@@ -253,10 +258,8 @@ function GateScreen() {
       <div
         ref={wrapRef}
         className={cn(
-          "relative z-10 flex h-full justify-center px-5",
-          keyboardOpen
-            ? "items-start touch-none overflow-hidden py-3"
-            : "items-center overflow-y-auto overscroll-contain py-10",
+          "relative z-10 flex h-full justify-center overflow-y-auto overscroll-contain px-5",
+          keyboardOpen ? "items-start py-3" : "items-center py-10",
         )}
       >
         <motion.div
@@ -302,9 +305,18 @@ function GateScreen() {
                   if (error) setError(null);
                 }}
                 placeholder={t("gate.placeholder")}
-                autoComplete="off"
+                /* An API key is not a login: "new-password" is what stops
+                   iOS/Safari from raising its saved-password sheet over the
+                   gate (it offered the user's Proxmox login here once). The
+                   data-* hints do the same for 1Password/LastPass. */
+                autoComplete="new-password"
+                autoCorrect="off"
                 autoCapitalize="off"
                 spellCheck={false}
+                inputMode="text"
+                enterKeyHint="go"
+                data-form-type="other"
+                data-lpignore="true"
                 disabled={busy}
                 aria-invalid={error?.tone === "invalid" || undefined}
                 aria-describedby={error ? "gate-api-key-error" : undefined}