Revert "feat(ui): Select, dropdown, popover styles & transitions (#11675)"

This reverts commit 377bf7ff21.

packages/ui/src/components/message-part.tsx

@@ -42,13 +42,13 @@ import { Checkbox } from "./checkbox"
 import { DiffChanges } from "./diff-changes"
 import { Markdown } from "./markdown"
 import { ImagePreview } from "./image-preview"
+import { findLast } from "@opencode-ai/util/array"
 import { getDirectory as _getDirectory, getFilename } from "@opencode-ai/util/path"
 import { checksum } from "@opencode-ai/util/encode"
 import { Tooltip } from "./tooltip"
 import { IconButton } from "./icon-button"
 import { createAutoScroll } from "../hooks"
 import { createResizeObserver } from "@solid-primitives/resize-observer"
-import { MorphChevron } from "./morph-chevron"
 
 interface Diagnostic {
   range: {
@@ -415,7 +415,7 @@ export function UserMessageDisplay(props: { message: UserMessage; parts: PartTyp
               toggleExpanded()
             }}
           >
-            <MorphChevron expanded={expanded()} />
+            <Icon name="chevron-down" size="small" />
           </button>
           <div data-slot="user-message-copy-wrapper">
             <Tooltip
@@ -898,7 +898,7 @@ ToolRegistry.register({
       if (!sessionId) return undefined
       // Find the tool part that matches the permission's callID
       const messages = data.store.message[sessionId] ?? []
-      const message = messages.findLast((m) => m.id === perm.tool!.messageID)
+      const message = findLast(messages, (m) => m.id === perm.tool!.messageID)
       if (!message) return undefined
       const parts = data.store.part[message.id] ?? []
       for (const part of parts) {