collect: send last 24 h of history on client connect (not same-day only)

Replace load_today_records with load_last_24h_records which computes a
rolling 24 h cutoff, globs log files for both the current and previous
calendar day, and filters records by timestamp — so clients always
receive a full 24 h window regardless of when midnight falls.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

collect.py

@@ -57,7 +57,7 @@ from pathlib import Path
 
 from server import log_config, network, we_connect
 from server.data_model import ALL_DOMAINS, collect_snapshot
-from server.storage_helpers import auto_out_path, load_store, load_today_records, save_store
+from server.storage_helpers import auto_out_path, load_last_24h_records, load_store, save_store
 
 log = logging.getLogger(__name__)
 
@@ -95,9 +95,9 @@ def run(args: argparse.Namespace) -> None:
 
     push_clients, push_lock, push_store_ref = network.start_push_server(args.host, args.port)
     if logs_dir is not None:
-        push_store_ref["preloaded"] = load_today_records(logs_dir, vin)
+        push_store_ref["preloaded"] = load_last_24h_records(logs_dir, vin)
         if push_store_ref["preloaded"]:
-            log.info("Pre-loaded %d record(s) from today's log files", len(push_store_ref["preloaded"]))
+            log.info("Pre-loaded %d record(s) from the last 24 h", len(push_store_ref["preloaded"]))
 
     current_day = datetime.now(timezone.utc).date()
     store = load_store(out, vin, args.interval)