RTL (right-to-left) text is mis-ordered in message bubbles and the input field

[kfatehi]

Description

Right-to-left languages (Persian/Farsi, Arabic, Hebrew) don't render correctly:

• In message bubbles, trailing punctuation and emoji appear on the wrong (right)
  side instead of the left, and text isn't right-aligned within the bubble.
• In the compose and subject fields, alignment/caret stays left-to-right while
  typing RTL.
• Conversation-list titles and last-message previews have the same mis-ordering.

Root cause: the message RichText/Text widgets and the input TextFields render
with the app's ambient (LTR) paragraph direction instead of one derived from the
text content.

Steps to reproduce

1. Send or receive a message in Farsi/Arabic/Hebrew that ends with punctuation
   or an emoji (e.g. سلام 😀).
2. The emoji/punctuation appears on the right and the text is left-aligned;
   correct RTL rendering would put the trailing emoji on the left with the text
   right-aligned.
3. Type RTL text in the compose field — input stays LTR.

Context

Reported on the OpenBubbles fork as OpenBubbles#174 (unfixed there).

A working fix — per-widget textDirection derived from the first strong
character of the text, computed over runes so emoji-leading RTL is detected
correctly — is in this commit:
b92461f

Filing here because BlueBubbles has no existing RTL issue.

In this branch, containing that commit, it looks correct like so: