Fix dashboard dns lookup delay

esphome/dashboard/dns.py

@@ -33,7 +33,9 @@ class DNSCache:
 
         Returns None if not in cache, list of addresses if found.
         """
-        if expire_time_addresses := self._cache.get(hostname):
+        # Normalize hostname for consistent lookups
+        normalized = hostname.rstrip(".").lower()
+        if expire_time_addresses := self._cache.get(normalized):
             expire_time, addresses = expire_time_addresses
             if expire_time > now_monotonic and not isinstance(addresses, Exception):
                 return addresses

esphome/dashboard/status/mdns.py

@@ -4,6 +4,8 @@ import asyncio
 import logging
 import typing
 
+from zeroconf import AddressResolver, IPVersion
+
 from esphome.zeroconf import (
     ESPHOME_SERVICE_TYPE,
     AsyncEsphomeZeroconf,
@@ -58,10 +60,12 @@ class MDNSStatus:
         if not self.aiozc:
             return None
 
-        from zeroconf import AddressResolver, IPVersion
+        # Normalize hostname: remove trailing dots and get the base name
+        normalized = host_name.rstrip(".").lower()
+        base_name = normalized.partition(".")[0]
 
         # Try to load from zeroconf cache without triggering resolution
-        info = AddressResolver(f"{host_name.partition('.')[0]}.local.")
+        info = AddressResolver(f"{base_name}.local.")
         if info.load_from_cache(self.aiozc.zeroconf):
             return info.parsed_scoped_addresses(IPVersion.All)
         return None