Put the clock on the working chips, and on all of them

The counter rode on the first chip, whichever state it happened to be in.
It now shows on every chip that is working and on no other: how long a
session has been at it is the thing that decides whether to wait for it,
where the age of an idle one only says how long ago you stopped looking.

The setting keeps its key and changes its name to "Show working time".

CLAUDE.md is new, and its first rule is the one broken twice: writing to
dconf from a shell attached to the live session bus wipes settings that
cannot be recovered.

prefs.js

@@ -52,8 +52,8 @@ export default class ClaudeCodeStatusPreferences extends ExtensionPreferences {
             _('The most urgent sessions get a chip; the rest are counted as “+N”.'),
             1, 12));
         dispGroup.add(this._switchRow(settings, 'show-age',
-            _('Show time in state'),
-            _('Shown on the most urgent session only.')));
+            _('Show working time'),
+            _('A counter on every session that is working, so you can see how long it has been at it. The menu lists ages either way.')));
 
         const zellijGroup = new Adw.PreferencesGroup({
             title: _('zellij'),