fix: restore image paste and image tool-result handling (#308)

src/hooks/usePasteHandler.test.ts

@@ -0,0 +1,22 @@
+import { expect, test } from 'bun:test'
+import { supportsClipboardImageFallback } from './usePasteHandler.ts'
+
+test('supports clipboard image fallback on Windows', () => {
+  expect(supportsClipboardImageFallback('windows')).toBe(true)
+})
+
+test('supports clipboard image fallback on macOS', () => {
+  expect(supportsClipboardImageFallback('macos')).toBe(true)
+})
+
+test('supports clipboard image fallback on Linux', () => {
+  expect(supportsClipboardImageFallback('linux')).toBe(true)
+})
+
+test('does not support clipboard image fallback on WSL', () => {
+  expect(supportsClipboardImageFallback('wsl')).toBe(false)
+})
+
+test('does not support clipboard image fallback on unknown platforms', () => {
+  expect(supportsClipboardImageFallback('unknown')).toBe(false)
+})