• use primary text color
• for "Message Request" and "Group Request" panels don't use inset glass panel
background as double insets use too much screen estate.
• modernize and unify appearance of different conversation input blocking panels.
• make chat search bar look pretty on iOS 26.
• add blur/tint under the conversation input bottom bar to improve legibility.
Fixes:
• interactive keyboard dismissal would accelerate scroll in conversation
• unpleasant appearance of the chat input bar open opening of the conversation
• define new shared color - "link" for both UIColor and Color.
• set default color (UIColor.Signal.link) for links in LinkingTextView.
• do not set "UIColor.clear" as underline color for links. just omitting underline style does the job.
