Fix archive cursor, navigation, and format cycling color

- Reset cursor to '..' (position 0) when entering an archive so it
  doesn't stay at the previous directory's cursor position
- Fix archive exit landing in /tmp when pressing Enter on '..' inside
  an archive by delegating to archive-aware goParent() in enterSelected()
- Fix goParent() to handle ALL navigation within archive mounts
  explicitly instead of falling through to filepath.Dir which may
  navigate outside the mount to /tmp
- Fix format cycling text color reset by preserving '(f to change)'
  hint in modal note, ensuring renderModalNoteLine applies proper
  key/action styling via the '(' separator match

vcom.toml

@@ -4,7 +4,7 @@ right_path = ''
 
 [ui]
 app_title = 'vcom'
-theme = 'eldritch'
+theme = 'vesper'
 icon_mode = 'auto'
 show_title_bar = true
 show_footer = true