tui: clean up search button in session header by removing magnifying glass icon and excess padding

packages/opencode/package.json

@@ -80,6 +80,7 @@
     "@ai-sdk/xai": "2.0.51",
     "@aws-sdk/credential-providers": "3.993.0",
     "@clack/prompts": "1.0.0-alpha.1",
+    "@effect/platform-node": "4.0.0-beta.31",
     "@gitlab/gitlab-ai-provider": "3.6.0",
     "@gitlab/opencode-gitlab-auth": "1.3.3",
     "@hono/standard-validator": "0.1.5",
@@ -95,7 +96,6 @@
     "@openrouter/ai-sdk-provider": "1.5.4",
     "@opentui/core": "0.1.87",
     "@opentui/solid": "0.1.87",
-    "@effect/platform-node": "4.0.0-beta.31",
     "@parcel/watcher": "2.5.1",
     "@pierre/diffs": "catalog:",
     "@solid-primitives/event-bus": "1.1.2",