Exit groups: two lists still spelled Back by hand

The chat picker and the TX-optimize target picker appended their own
Separator + Back rows; back_rows is the enforcement point that keeps the
exit language from drifting (housekeeping H-004).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

meshterm/tools/chat.py

@@ -38,7 +38,7 @@ from ..core.models import (
 )
 from ..services.trace_runner import NameKeyResolver, make_name_key_resolver
 from ..ui.chat import _MENTION, _split_channel_sender
-from ..ui.menus import Lane, column_header, fit_cells, section_heading
+from ..ui.menus import Lane, back_rows, column_header, fit_cells, section_heading
 from ..ui.theme import name_style
 from ..ui.tui import Choice, DeleteRequest, Separator
 from ..ui.widgets import _NODE_GLYPHS, channel_glyph
@@ -185,8 +185,7 @@ class ChatTool(Tool):
             else:
                 items.append(Separator("  no contacts yet — receive an advert first"))
 
-            items.append(Separator(" "))
-            items.append(Choice(title="Back", value="__back__"))
+            items.extend(back_rows("__back__"))
 
             default = next(
                 (

meshterm/tools/tx_optimize.py

@@ -409,7 +409,8 @@ async def _pick_target(
         The chosen contact name, or ``None`` if cancelled. With no other contacts,
         falls back to a free-text prompt so a hex key prefix can be typed.
     """
-    from ..ui.tui import Choice, Separator
+    from ..ui.menus import back_rows
+    from ..ui.tui import Choice
     from ..ui.widgets import _DEFAULT_GLYPH, _NODE_GLYPHS
 
     candidates = [c for c in contacts if c.name != admin.name]
@@ -435,8 +436,7 @@ async def _pick_target(
             key=lambda c: -(c.last_seen.timestamp() if c.last_seen else 0.0),
         )
     ]
-    items.append(Separator(" "))
-    items.append(Choice(title="Back", value=None))
+    items.extend(back_rows(None))
     choice = await ctx.ui.select(
         "TX optimize — measure at",
         items,