Fix tabs not syncing correctly in docs (#2420)

Fixes #2171
<!-- ELLIPSIS_HIDDEN -->

----

> [!IMPORTANT]
> Improve BAML documentation by adding language-specific examples and
correcting tab titles for better syntax highlighting.
> 
>   - **Documentation**:
> - Add `language` attribute to `<Tab>` components in `streaming.mdx`
and `openapi-howto-rely-on-envvars.mdx` for better syntax highlighting.
> - Correct tab titles in `streaming.mdx` for Ruby and PHP to include
`language` attribute.
> - Add detailed examples for streaming in various languages (Python,
TypeScript, Go, Ruby) in `streaming.mdx`.
> - Add examples for using environment variables in API clients for
multiple languages (Go, Java, PHP, Ruby, Rust) in
`openapi-howto-rely-on-envvars.mdx`.
> 
> <sup>This description was created by </sup>[<img alt="Ellipsis"
src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=BoundaryML%2Fbaml&utm_source=github&utm_medium=referral)<sup>
for 330b769. You can
[customize](https://app.ellipsis.dev/BoundaryML/settings/summaries) this
summary. It will automatically update as commits are pushed.</sup>

<!-- ELLIPSIS_HIDDEN -->

Author: aaronvg

fern/01-guide/02-languages/rest.mdx

@@ -25,15 +25,15 @@ We integrate with [OpenAPI](https://www.openapis.org/) (universal API definition
   ### Install NPX + OpenAPI
 
      <Tabs>
-        <Tab title="macOS (brew)">
+        <Tab title="macOS (brew)" language="bash">
           ```bash
           brew install npm openapi-generator
           # 'npm' will install npx
           # 'openapi-generator' will install both Java and openapi-generator-cli
           ```
         </Tab>
 
-        <Tab title="Linux (apt)">
+        <Tab title="Linux (apt)" language="bash">
           OpenAPI requires `default-jdk`
 
           ```bash
@@ -42,7 +42,7 @@ We integrate with [OpenAPI](https://www.openapis.org/) (universal API definition
           ```
         </Tab>
 
-        <Tab title="Linux (yum/dnf)">
+        <Tab title="Linux (yum/dnf)" language="bash">
           OpenAPI requires Java
 
           ```bash
@@ -67,7 +67,7 @@ We integrate with [OpenAPI](https://www.openapis.org/) (universal API definition
           ```
         </Tab>
 
-        <Tab title="Windows">
+        <Tab title="Windows" language="powershell">
           To install `npx` and `java` (for OpenAPI):
 
             1. Use the [Node.js installer](https://nodejs.org/en/download/prebuilt-installer) to install `npx` (default installer settings are fine).
@@ -82,7 +82,7 @@ We integrate with [OpenAPI](https://www.openapis.org/) (universal API definition
           ```
         </Tab>
 
-        <Tab title="Other">
+        <Tab title="Other" language="bash">
           To install `npx`, use the [Node.js installer](https://nodejs.org/en/download/prebuilt-installer).
 
           To install `java` (for OpenAPI), use the [Adoptium OpenJDK packages](https://adoptium.net/installation/linux/).
@@ -93,14 +93,14 @@ We integrate with [OpenAPI](https://www.openapis.org/) (universal API definition
       This will give you some starter BAML code in a `baml_src` directory.
     <Tabs>
 
-      <Tab title="C#">
+      <Tab title="C#" language="bash">
       ```bash
       npx @boundaryml/baml init \
         --client-type rest/openapi --openapi-client-type csharp
       ```
       </Tab>
 
-      <Tab title="C++">
+      <Tab title="C++" language="bash">
 
       <Tip>OpenAPI supports [5 different C++ client types][openapi-client-types];
       any of them will work with BAML.</Tip>
@@ -111,14 +111,14 @@ We integrate with [OpenAPI](https://www.openapis.org/) (universal API definition
       ```
       </Tab>
 
-      <Tab title="Go">
+      <Tab title="Go" language="bash">
       ```bash
       npx @boundaryml/baml init \
         --client-type rest/openapi --openapi-client-type go
       ```
       </Tab>
 
-      <Tab title="Java">
+      <Tab title="Java" language="bash">
 
       ```bash
       npx @boundaryml/baml init \
@@ -138,28 +138,28 @@ We integrate with [OpenAPI](https://www.openapis.org/) (universal API definition
 
       </Tab>
 
-      <Tab title="PHP">
+      <Tab title="PHP" language="bash">
       ```bash
       npx @boundaryml/baml init \
         --client-type rest/openapi --openapi-client-type php
       ```
       </Tab>
 
-      <Tab title="Ruby">
+      <Tab title="Ruby" language="bash">
       ```bash
       npx @boundaryml/baml init \
         --client-type rest/openapi --openapi-client-type ruby
       ```
       </Tab>
 
-      <Tab title="Rust">
+      <Tab title="Rust" language="bash">
       ```bash
       npx @boundaryml/baml init \
         --client-type rest/openapi --openapi-client-type rust
       ```
       </Tab>
 
-      <Tab title="Other">
+      <Tab title="Other" language="bash">
 
       As long as there's an OpenAPI client generator that works with your stack,
       you can use it with BAML. Check out the [full list in the OpenAPI docs][openapi-client-types].
@@ -210,7 +210,7 @@ We integrate with [OpenAPI](https://www.openapis.org/) (universal API definition
 
 <Tabs>
 
-<Tab title="Go">
+<Tab title="Go" language="go">
 
 Run this with `go run main.go`:
 
@@ -241,7 +241,7 @@ func main() {
 ```
 </Tab>
 
-<Tab title="Java">
+<Tab title="Java" language="java">
 First, add the OpenAPI-generated client to your project.
 
 <AccordionGroup>
@@ -374,7 +374,7 @@ public class Example {
 ```
 </Tab>
 
-<Tab title="PHP">
+<Tab title="PHP" language="php">
 
 <Warning>
   The PHP OpenAPI generator doesn't support OpenAPI's `oneOf` type, which is
@@ -417,7 +417,7 @@ try {
 ```
 </Tab>
 
-<Tab title="Ruby">
+<Tab title="Ruby" language="ruby">
 
 Use `ruby -Ilib/baml_client app.rb` to run this:
 
@@ -457,7 +457,7 @@ end
 ```
 </Tab>
 
-<Tab title="Rust">
+<Tab title="Rust" language="rust">
 
 <Tip>
   If you're using `cargo watch -- cargo build` and seeing build failures because it can't find

fern/01-guide/03-development/deploying/openapi.mdx

@@ -53,7 +53,7 @@ CMD baml-cli serve --preview --port 2024
 
 <Tabs>
 
-<Tab title="Using docker-compose">
+<Tab title="Using docker-compose" language="bash">
 
 Assuming you intend to run your own application in a container, we recommend
 using `docker-compose` to run your app and BAML-over-HTTP side-by-side:
@@ -96,7 +96,7 @@ services:
 
 </Tab>
 
-<Tab title="Using docker">
+<Tab title="Using docker" language="bash">
 
 If you don't care about using `docker-compose`, you can just run:
 
@@ -188,15 +188,15 @@ To secure your BAML server, you can also set a password on it using the
 
 <Tabs>
 
-<Tab title="bash">
+<Tab title="bash" language="bash">
 
 ```bash
 BAML_PASSWORD=sk-baml-your-secret-password \
   baml-cli serve --preview --port 2024
 ```
 </Tab>
 
-<Tab title="Dockerfile">
+<Tab title="Dockerfile" language="docker">
 
 ```docker
 FROM node:20
@@ -224,14 +224,14 @@ If you attach your password to the request, you'll see that it now returns `200
 
 <Tabs>
 
-<Tab title="Using HTTP basic auth">
+<Tab title="Using HTTP basic auth" language="bash">
 ```bash
 export BAML_PASSWORD=sk-baml-your-secret-password
 curl "http://baml:${BAML_PASSWORD}@localhost:2024/_debug/status"
 ```
 </Tab>
 
-<Tab title="Using X-BAML-API-KEY">
+<Tab title="Using X-BAML-API-KEY" language="bash">
 ```bash
 export BAML_PASSWORD=sk-baml-your-secret-password
 curl "http://localhost:2024/_debug/status" -H "X-BAML-API-KEY: ${BAML_PASSWORD}"

fern/01-guide/04-baml-basics/abort-signal.mdx

@@ -14,7 +14,7 @@ Abort controllers allow you to cancel ongoing LLM operations, which is essential
 ## Quick Start
 
 <Tabs>
-  <Tab title="TypeScript">
+  <Tab title="TypeScript" language="typescript">
     ```typescript
     import { b } from '@/baml_client'
 
@@ -51,7 +51,7 @@ Abort controllers allow you to cancel ongoing LLM operations, which is essential
     ```
   </Tab>
 
-  <Tab title="Python">
+  <Tab title="Python" language="python">
     ```python
     from baml_client import b
     # Python doesn't have a native abort controller construct,
@@ -76,7 +76,7 @@ Abort controllers allow you to cancel ongoing LLM operations, which is essential
     ```
   </Tab>
 
-  <Tab title="Go">
+  <Tab title="Go" language="go">
     ```go
     import (
         "context"
@@ -108,7 +108,7 @@ Abort controllers allow you to cancel ongoing LLM operations, which is essential
 Automatically cancel operations that take too long:
 
 <Tabs>
-  <Tab title="TypeScript">
+  <Tab title="TypeScript" language="typescript">
     ```typescript
     // Modern approach using AbortSignal.timeout()
     async function extractWithTimeout(text: string, timeoutMs: number = 30000) {
@@ -151,7 +151,7 @@ Automatically cancel operations that take too long:
     ```
   </Tab>
 
-  <Tab title="Python">
+  <Tab title="Python" language="python">
     ```python
     import asyncio
     from baml_py import AbortController
@@ -181,7 +181,7 @@ Automatically cancel operations that take too long:
     ```
   </Tab>
 
-  <Tab title="Go">
+  <Tab title="Go" language="go">
     ```go
     func extractWithTimeout(text string, timeout time.Duration) (Result, error) {
         ctx, cancel := context.WithTimeout(context.Background(), timeout)
@@ -206,7 +206,7 @@ Automatically cancel operations that take too long:
 Build responsive backend services that allow users to cancel long-running operations:
 
 <Tabs>
-  <Tab title="TypeScript (Express)">
+  <Tab title="TypeScript (Express)" language="typescript">
     ```typescript
     import express from 'express'
     import { b } from '@/baml_client'
@@ -251,7 +251,7 @@ Build responsive backend services that allow users to cancel long-running operat
     ```
   </Tab>
 
-  <Tab title="Python (FastAPI)">
+  <Tab title="Python (FastAPI)" language="python">
     ```python
     from fastapi import FastAPI, BackgroundTasks
     from baml_py import AbortController
@@ -291,7 +291,7 @@ Build responsive backend services that allow users to cancel long-running operat
 Abort controllers work seamlessly with streaming responses:
 
 <Tabs>
-  <Tab title="TypeScript">
+  <Tab title="TypeScript" language="typescript">
     ```typescript
     const controller = new AbortController()
 
@@ -321,7 +321,7 @@ Abort controllers work seamlessly with streaming responses:
     ```
   </Tab>
 
-  <Tab title="Python">
+  <Tab title="Python" language="python">
     ```python
     controller = AbortController()
 
@@ -344,7 +344,7 @@ Abort controllers work seamlessly with streaming responses:
     ```
   </Tab>
 
-  <Tab title="Go">
+  <Tab title="Go" language="go">
     ```go
     ctx, cancel := context.WithCancel(context.Background())
     defer cancel()
@@ -373,7 +373,7 @@ Abort controllers work seamlessly with streaming responses:
 Properly handle abort errors to distinguish cancellations from other failures:
 
 <Tabs>
-  <Tab title="TypeScript">
+  <Tab title="TypeScript" language="typescript">
     ```typescript
     import { BamlAbortError } from '@/baml_client'
 
@@ -400,7 +400,7 @@ Properly handle abort errors to distinguish cancellations from other failures:
     ```
   </Tab>
 
-  <Tab title="Python">
+  <Tab title="Python" language="python">
     ```python
     from baml_py import BamlAbortError, BamlValidationError
 
@@ -426,7 +426,7 @@ Properly handle abort errors to distinguish cancellations from other failures:
     ```
   </Tab>
 
-  <Tab title="Go">
+  <Tab title="Go" language="go">
     ```go
     result, err := b.ExtractResume(ctx, text)
     if err != nil {
@@ -454,7 +454,7 @@ Properly handle abort errors to distinguish cancellations from other failures:
 ### When to Use Each Pattern
 
 <Tabs>
-  <Tab title="TypeScript">
+  <Tab title="TypeScript" language="typescript">
     ```typescript
     // ✅ Use AbortSignal.timeout() for simple timeouts
     const result = await b.ExtractResume(text, {