fix(hosts): remove port filter hint to fix filter bar alignment

The field-hint span made the port field taller than others; with
align-items: end on the grid, the input was offset upward.
The placeholder now carries the same information.

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

src/client/hosts.rs

@@ -156,13 +156,12 @@ fn FilterBar(
                     "Open ports"
                     <input
                         type="text"
-                        placeholder="e.g. 80, 443"
+                        placeholder="e.g. 80, 443 (all required)"
                         on:change=move |e| {
                             port_filter.set(event_target_value(&e));
                             page.set(1);
                         }
                     />
-                    <span class="field-hint">"All listed ports must be open"</span>
                 </label>
 
                 <label class="filter-field">