tui: make the title bar search easier to scan without a redundant icon

packages/app/src/components/session/session-header.tsx

@@ -274,12 +274,11 @@ export function SessionHeader() {
               type="button"
               variant="ghost"
               size="small"
-              class="hidden md:flex w-[240px] max-w-full min-w-0 pl-0.5 pr-2 items-center gap-2 justify-between rounded-md border border-border-weak-base bg-surface-panel shadow-none cursor-default"
+              class="hidden md:flex w-[240px] max-w-full min-w-0 items-center gap-2 justify-between rounded-md border border-border-weak-base bg-surface-panel shadow-none cursor-default"
               onClick={() => command.trigger("file.open")}
               aria-label={language.t("session.header.searchFiles")}
             >
-              <div class="flex min-w-0 flex-1 items-center gap-1.5 overflow-visible">
-                <Icon name="magnifying-glass" size="small" class="icon-base shrink-0 size-4" />
+              <div class="flex min-w-0 flex-1 items-center overflow-visible">
                 <span class="flex-1 min-w-0 text-12-regular text-text-weak truncate text-left">
                   {language.t("session.header.search.placeholder", {
                     project: name(),