Local in-progress work (committed at the author's request as a checkpoint
before unrelated true-font-height work lands on top): introduces a
dedicated `codeBlock` InstantPage font/text style (.monospace / .codeBlock
font cases + monospace font resolution), adds a `codeBlock` field to the
InstantPage text-attributes theme and threads it through the rich-data
bubble and the send preview, and unifies the rich-bubble code-block
background/secondary-control colors.
Implement the nine message-entity RichText cases (textMention,
textMentionName, textHashtag, textCashtag, textBotCommand, textBankCard,
textAutoUrl, textAutoEmail, textAutoPhone): model + Postbox coding,
FlatBuffers schema/codec, Api.RichText parsing/serialization (lossless),
InstantPage display attaching the matching TelegramTextAttributes keys, and
tap routing in the rich-data bubble mirroring ChatMessageTextBubbleContentNode.
mentionName display resolves via EnginePeer.Id (PeerId not in scope).
Also lets rich-data text selection reach a line's trailing edge and fixes
the date/status node positioning to match TextBubble.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
