feat(07-02): add tooltipText to registry fields + render ⓘ in FieldRenderer and PasswordField

- Populate tooltipText for azureblob.sas_url, azureblob.key, and onedrive.token in registry
- Add tooltipText prop and showTooltip state to PasswordField with toggle button + panel
- Add showTooltip state to FieldRenderer; pass tooltipText to PasswordField for password branch
- Add ⓘ button + panel for text/select branches in FieldRenderer
- Use sr-only span for accessible name to avoid getByLabelText collision

src/components/ui/PasswordField.tsx

@@ -8,15 +8,34 @@ interface PasswordFieldProps {
   registration: UseFormRegisterReturn;
   placeholder?: string;
   helpText?: string;
+  tooltipText?: string;
 }
 
-export function PasswordField({ id, label, error, registration, placeholder, helpText }: PasswordFieldProps) {
+export function PasswordField({ id, label, error, registration, placeholder, helpText, tooltipText }: PasswordFieldProps) {
   const [show, setShow] = useState(false);
+  const [showTooltip, setShowTooltip] = useState(false);
   return (
     <div className="flex flex-col gap-1">
-      <label htmlFor={id} className="text-sm font-medium text-gray-700">
-        {label}
-      </label>
+      <div className="flex items-center gap-1">
+        <label htmlFor={id} className="text-sm font-medium text-gray-700">
+          {label}
+        </label>
+        {tooltipText && (
+          <button
+            type="button"
+            onClick={() => setShowTooltip(v => !v)}
+            className="text-blue-500 hover:text-blue-700 text-xs leading-none"
+          >
+            <span className="sr-only">More info about {label}</span>
+            <span aria-hidden="true">ⓘ</span>
+          </button>
+        )}
+      </div>
+      {tooltipText && showTooltip && (
+        <p className="text-xs text-blue-700 bg-blue-50 border border-blue-200 rounded px-2 py-1.5 mt-1">
+          {tooltipText}
+        </p>
+      )}
       <div className="relative">
         <input
           id={id}