fix(bidi): isolate leading and inline English words in RTL paragraphs

- In parseInlineSource, wrap consecutive Latin/LTR tokens in LTR isolates (LRI...PDI)
  when rendering inside an RTL block, preventing leading English terms like "Okay"
  from flipping paragraph layout direction and causing BiDi line shuffling.
- Switch textDirection from TextDirection.ContentOrRtl to explicit TextDirection.Rtl
  when isRtl is true across MarkdownText, ChatBubble, and GroupChatScreen, preventing
  first-strong character fallbacks from overriding resolved paragraph direction.

app/src/test/java/com/m57/hermescontrol/ui/chat/MarkdownTextFeatureTest.kt

@@ -563,4 +563,12 @@ class MarkdownTextFeatureTest {
         val parsed = parseInline(input, Color.Black, "", false, Color.Blue, DEFAULT_HIGHLIGHTS)
         assertEquals("Run val x = 1 here", parsed.toString())
     }
+
+    @Test
+    fun testArabicStartingWithEnglishWord_wrapsEnglishInLtrIsolate() {
+        val input = "Okay سكرت كلشي وصار كامل عربي متل ما بدك يا بوبو"
+        val parsed = parseInline(input, Color.Black, "", false, Color.Blue, DEFAULT_HIGHLIGHTS)
+        val expected = "${BidiUtils.LRI}Okay${BidiUtils.PDI} سكرت كلشي وصار كامل عربي متل ما بدك يا بوبو"
+        assertEquals(expected, parsed.toString())
+    }
 }