fix: accept bare browser addresses

The Browser workbar required users to enter a complete HTTP(S) URL, so submitting a bare domain or host with a port failed URL validation. Enter and Go now prepend http:// before using the existing browser navigation path.

Explicit protocols remain unchanged so the Main browser URL policy continues to reject unsupported schemes with the correct error.

Release note: 浏览器地址栏现在支持直接输入域名或主机端口，回车或点击“前往”时会自动补全 http://。

src/renderer/src/App.test.tsx

@@ -9630,16 +9630,39 @@ describe('App', () => {
     expect(address).toHaveValue('https://example.com/start')
 
     fireEvent.change(address, {
-      target: { value: 'https://example.com/enter' }
+      target: { value: 'example.com/enter' }
     })
     fireEvent.keyDown(address, { key: 'Enter' })
     await waitFor(() =>
       expect(api.browser.navigate).toHaveBeenLastCalledWith(
         expect.any(String),
-        'https://example.com/enter'
+        'http://example.com/enter'
       )
     )
-    expect(api.browser.navigate).toHaveBeenCalledTimes(2)
+    expect(address).toHaveValue('http://example.com/enter')
+
+    fireEvent.change(address, {
+      target: { value: 'mailto:user@example.com' }
+    })
+    fireEvent.keyDown(address, { key: 'Enter' })
+    await waitFor(() =>
+      expect(api.browser.navigate).toHaveBeenLastCalledWith(
+        expect.any(String),
+        'mailto:user@example.com'
+      )
+    )
+
+    fireEvent.change(address, {
+      target: { value: 'localhost:3000/path' }
+    })
+    fireEvent.keyDown(address, { key: 'Enter' })
+    await waitFor(() =>
+      expect(api.browser.navigate).toHaveBeenLastCalledWith(
+        expect.any(String),
+        'http://localhost:3000/path'
+      )
+    )
+    expect(api.browser.navigate).toHaveBeenCalledTimes(4)
   })
 
   it('suppresses duplicate browser actions while keeping stop loading available', async () => {

src/renderer/src/RightAssistantSidebar.tsx

@@ -237,6 +237,18 @@ function measureSplitLayoutWidth(
   return measuredWidth > 0 ? measuredWidth : fallbackWidth
 }
 
+function addDefaultBrowserProtocol(address: string): string {
+  const protocol = /^[a-z][a-z\d+.-]*:/iu.exec(address)?.[0]
+  if (
+    protocol &&
+    (/^https?:$/iu.test(protocol) ||
+      !/^\d+(?:[/?#]|$)/u.test(address.slice(protocol.length)))
+  ) {
+    return address
+  }
+  return `http://${address}`
+}
+
 function BrowserToolbar({
   activeConversationId,
   browserState,
@@ -325,10 +337,12 @@ function BrowserToolbar({
   }
 
   const submitAddress = async (): Promise<void> => {
-    const url = displayedAddress.trim()
-    if (goDisabled || !url) {
+    const address = displayedAddress.trim()
+    if (goDisabled || !address) {
       return
     }
+    const url = addDefaultBrowserProtocol(address)
+    setAddressDraft(url)
     if (await runToolbarAction(() => onNavigate(url))) {
       setDirty(false)
       setEditing(false)