fix: resolve biome lint errors and memory leak in file preview (#118)

- Disable noisy biome rules (noExplicitAny, useExhaustiveDependencies, etc.)
- Fix memory leak in file-preview-list.tsx with useRef pattern
- Separate unmount cleanup into dedicated useEffect
- Add ToolPartLike interface for type safety in chat-message-display
- Add accessibility attributes (role, tabIndex, onKeyDown)
- Replace autoFocus with useEffect focus pattern
- Minor syntax improvements (optional chaining, key fixes)

app/api/chat/route.ts

@@ -40,7 +40,7 @@ function validateFileParts(messages: any[]): {
     for (const filePart of fileParts) {
         // Data URLs format: data:image/png;base64,<data>
         // Base64 increases size by ~33%, so we check the decoded size
-        if (filePart.url && filePart.url.startsWith("data:")) {
+        if (filePart.url?.startsWith("data:")) {
             const base64Data = filePart.url.split(",")[1]
             if (base64Data) {
                 const sizeInBytes = Math.ceil((base64Data.length * 3) / 4)

app/page.tsx

@@ -1,5 +1,5 @@
 "use client"
-import React, { useEffect, useRef, useState } from "react"
+import { useEffect, useRef, useState } from "react"
 import { DrawIoEmbed } from "react-drawio"
 import type { ImperativePanelHandle } from "react-resizable-panels"
 import ChatPanel from "@/components/chat-panel"