fix: worktree session UI safety and visibility (review)

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

tests/test_tui.py

@@ -1404,18 +1404,24 @@ async def test_confirm_delete_cancel_returns_none():
 
 
 def test_format_session_text_appends_worktree_branch_marker():
+    """nickname != branch → show both nickname and branch around the ⎇ glyph."""
     from hqt.tui.widgets.session_list import format_session_text
 
     text = format_session_text("mywork", "claude", "idle", "●", "feature-x")
-    assert "⎇ feature-x" in text
+    assert "mywork ⎇ feature-x" in text
 
 
-def test_format_session_text_no_marker_when_nickname_equals_branch():
-    """Avoid duplication: when nickname already equals the branch, no marker."""
+def test_format_session_text_marker_shows_once_when_nickname_equals_branch():
+    """nickname == branch (the common case) → ⎇ still appears, glyph once, no
+    duplicated branch name."""
     from hqt.tui.widgets.session_list import format_session_text
 
     text = format_session_text("feature-x", "claude", "idle", "●", "feature-x")
-    assert "⎇" not in text
+    assert "⎇" in text
+    # Glyph appears exactly once, and the branch is not duplicated.
+    assert text.count("⎇") == 1
+    assert "⎇ feature-x" in text
+    assert "feature-x ⎇" not in text
 
 
 def test_format_session_text_no_marker_for_plain_session():