Require full key coverage when saving autoscaling policies

src/routes/autoscaling/+page.svelte

@@ -83,6 +83,7 @@
                         <label>Action cooldown in minutes<input type="number" min="1" max="1440" required bind:value={settings.cooldownMinutes} /></label>
                     </div>
                     {#if settings.mapSlug === '*'}<p>Targets apply separately to every map, including all variants. Each map needs its own keys. Actions share one cooldown and run one at a time across the game.</p>{/if}
+                    <p>Saved lobby keys must cover the maximum for each selected map before you can save a new policy, including Dry run.</p>
                     <div class="actions"><Button type="submit" disabled={busy}>Preview changes</Button><Button onclick={() => editorOpen = false}>Close editor</Button></div>
                 </fieldset>
             </form>