feat(setup-wizard): improve E2EE dialog UX and password field

- Only show the passphrase and "Obfuscate Properties" controls once
  end-to-end encryption is enabled, instead of leaving them visible
  but disabled.
- Replace the password show/hide checkbox with an icon toggle button.
- Let translated labels wrap to their content instead of being
  clipped into a fixed-width column (this clipped longer translated
  labels, e.g. in German and Spanish).
- Scope the onboarding invitation link's 44px touch-target padding to
  mobile, so on desktop it renders as a normal inline link instead of
  a stray, oddly-padded button.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

styles.css

@@ -353,6 +353,12 @@ body {
 }
 
 .sls-onboarding-invitation-action {
+    display: inline;
+}
+
+/* Touch devices need a larger tap target; on desktop this would just pad the
+   link with blank space and make it look like a misplaced button. */
+body.is-mobile .sls-onboarding-invitation-action {
     display: inline-flex;
     min-width: 44px;
     min-height: 44px;