Fix GLM-5 and other reasoning models appearing to hang via OpenAI shim (#365)

* Fix GLM-5 and other reasoning models appearing to hang via OpenAI shim

Reasoning models like GLM-5 and DeepSeek stream chain-of-thought in
`reasoning_content` while `content` stays empty (""). The OpenAI shim
only read `delta.content`, so it saw empty strings and never emitted
any Anthropic stream events — causing the UI to appear frozen.

- Add `reasoning_content` to streaming chunk and non-streaming response types
- Emit `reasoning_content` as thinking blocks (thinking_delta) in streaming mode
- Properly transition from thinking to text blocks when content phase begins
- Fall back to `reasoning_content` in non-streaming mode when content is null

Fixes #214

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Fix non-streaming reasoning_content fallback and add tests

- Use explicit empty-string check instead of || for content fallback
  so content: "" doesn't leak reasoning_content as visible text
- Close thinking block before tool call blocks in streaming path
- Add non-streaming and streaming reasoning_content tests

Co-Authored-By: GLM-5.1 <noreply@openclaude.dev>

* Fix flaky Ink reconciler tests caused by react-compiler memoization

Remove hard throw in createTextInstance that crashed when hostContext.isInsideText
was stale due to react-compiler element caching. Add timeout guards to prevent
test hangs when render errors prevent exit() from firing.

Co-Authored-By: Claude GLM-5.1 <noreply@openclaude.dev>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: GLM-5.1 <noreply@openclaude.dev>

src/commands/provider/provider.test.tsx

@@ -52,7 +52,11 @@ async function renderFinalFrame(node: React.ReactNode): Promise<string> {
     patchConsole: false,
   })
 
-  await instance.waitUntilExit()
+  // Timeout guard: if render throws before exit effect fires, don't hang
+  await Promise.race([
+    instance.waitUntilExit(),
+    new Promise<void>(resolve => setTimeout(resolve, 3000)),
+  ])
   return stripAnsi(extractLastFrame(getOutput()))
 }