…r 12.3

Set textContentType (username / password) on the xAuth login fields so iOS
recognises the form and offers saved logins and the Passwords key in the
QuickType bar — the native equivalent of tagging a web form's inputs with
autocomplete=username / current-password.

…#4)

The composer's Post button disappeared whenever "Hide Grok analyze buttons"
was on, making posting impossible (#2). BHTRemoveGrokBarButtonItems matched
every UIBarButtonItem with a nil accessibilityLabel: [nil rangeOfString:@"grok"]
.location is 0 (a zeroed NSRange from messaging nil), which is != NSNotFound,
so unlabeled bar buttons — the Post button included — were deleted. Guard for a
non-nil label before matching.

Also replace the over-broad TFNButton didMoveToWindow Grok heuristic (it hid any
unlabeled nav-bar button that had a menu — the Post button is exactly that) with
positive identification: hide only TFNButtons whose primary-action menu contains
a Grok item ("Analyse with Grok" / "Open in Grok").

Other broken toggles:
- restore_follow_button ("No Subscribe button"): drop the unconditional
  -[TUIFollowControl variant] override that returned 32 for every read, which
  hid the Follow button on every tweet. The setVariant: remap already converts
  Subscribe (1) -> Follow (32).
- hidePremiumOffer ("No Twitter Blue prompts"): read the pref instead of a
  hardcoded `return YES` (the toggle was stuck on).
- DisableVODCaptions ("No video captions"): read the key the settings UI writes
  (video_layer_caption) instead of an unexposed dis_VODCaptions (toggle was dead).
- refresh_pill_label: scope the "Tweeted" relabel to the new-posts pill instead
  of overriding every TFNPillControl's text.

Co-authored-by: thea <git@thea.pet>