fix(ui): align log search input styling with EventFeed, render ellipsis

JSX attribute strings don't process JS escape sequences — "Search logs\u2026"
rendered the literal "\u2026" in the placeholder. Replaced with the actual
ellipsis character.

Also aligned .logSearchInput (Application Log search) with EventFeed's
internal search input: --bg-surface background, --border border,
mono font family, 28px height. Previously used --bg-body + --border-subtle
+ body font, which looked visibly different next to the Timeline panel.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ui/src/pages/AgentHealth/AgentHealth.tsx

@@ -920,7 +920,7 @@ export default function AgentHealth() {
               <input
                 type="text"
                 className={logStyles.logSearchInput}
-                placeholder="Search logs\u2026"
+                placeholder="Search logs…"
                 value={logSearch}
                 onChange={(e) => setLogSearch(e.target.value)}
                 aria-label="Search logs"

ui/src/pages/AgentInstance/AgentInstance.tsx

@@ -426,7 +426,7 @@ export default function AgentInstance() {
               <input
                 type="text"
                 className={logStyles.logSearchInput}
-                placeholder="Search logs\u2026"
+                placeholder="Search logs…"
                 value={logSearch}
                 onChange={(e) => setLogSearch(e.target.value)}
                 aria-label="Search logs"