fix: preserve active break over reload checkpoint (Closes #1394)

tests/test_today_break.py

@@ -122,6 +122,35 @@ process.stdout.write(JSON.stringify({adopted,snapshot:timer.snapshot(),pending:t
     }
 
 
+def test_reload_running_checkpoint_cannot_restart_item_during_valid_local_break():
+    script = TIMER.read_text() + r"""
+const values = new Map();
+const storage = {getItem:key=>values.get(key)||null,setItem:(key,value)=>values.set(key,value)};
+const timer = createTodayTimer({storage,getLogin:()=> 'timmy',now:()=>100000});
+timer.activate('issue:r:42:');
+timer.startBreak(5);
+const adopted = timer.adopt('issue:r:42:', 12000, true, [
+  {identity:'issue:r:42:',elapsed_ms:12000},
+]);
+process.stdout.write(JSON.stringify({adopted,snapshot:timer.snapshot(),pending:timer.breakSnapshot()}));
+"""
+
+    assert run_node(script) == {
+        "adopted": True,
+        "snapshot": {
+            "identity": "issue:r:42:",
+            "elapsed_ms": 12000,
+            "running": False,
+            "break_deadline_at": 400_000,
+        },
+        "pending": {
+            "identity": "issue:r:42:",
+            "deadline_at": 400_000,
+            "expired": False,
+        },
+    }
+
+
 def test_break_expiry_never_restarts_time_and_resume_is_explicit_and_idempotent():
     script = TIMER.read_text() + r"""
 const values = new Map();