docs: replace deprecated opencode auth login command with /connect across all documentation

Users no longer need to exit the TUI to add providers - they can now use the /connect command directly in the terminal interface. Updated all provider setup instructions to use simplified format with /connect command instead of the deprecated opencode auth login CLI command. Added /connect to TUI commands reference and streamlined provider documentation to show clearer, more concise setup steps.

packages/web/src/content/docs/config.mdx

@@ -362,7 +362,7 @@ You can disable providers that are loaded automatically through the `disabled_pr
 The `disabled_providers` option accepts an array of provider IDs. When a provider is disabled:
 
 - It won't be loaded even if environment variables are set.
-- It won't be loaded even if API keys are configured through `opencode auth login`.
+- It won't be loaded even if API keys are configured through the `/connect` command.
 - The provider's models won't appear in the model selection list.
 
 ---

packages/web/src/content/docs/index.mdx

@@ -132,23 +132,21 @@ If you are new to using LLM providers, we recommend using [OpenCode Zen](/docs/z
 It's a curated list of models that have been tested and verified by the OpenCode
 team.
 
-1. Run `opencode auth login`, select opencode, and head to [opencode.ai/auth](https://opencode.ai/auth).
+1. Run the `/connect` command in the TUI, select opencode, and head to [opencode.ai/auth](https://opencode.ai/auth).
+
+   ```txt
+   /connect
+   ```
+
 2. Sign in, add your billing details, and copy your API key.
+
 3. Paste your API key.
 
-   ```bash
-   $ opencode auth login
-
-   ┌  Add credential
+   ```txt
+   ┌ API key
    │
-   ◇  Select provider
-   │  opencode
    │
-   ●  Create an api key at https://opencode.ai/auth
-   │
-   ◆  Enter your API key
-   │  _
-   └
+   └ enter
    ```
 
 Alternatively, you can select one of the other providers. [Learn more](/docs/providers#directory).

packages/web/src/content/docs/models.mdx

@@ -9,7 +9,7 @@ OpenCode uses the [AI SDK](https://ai-sdk.dev/) and [Models.dev](https://models.
 
 ## Providers
 
-Most popular providers are preloaded by default. If you've added the credentials for a provider through `opencode auth login`, they'll be available when you start OpenCode.
+Most popular providers are preloaded by default. If you've added the credentials for a provider through the `/connect` command, they'll be available when you start OpenCode.
 
 Learn more about [providers](/docs/providers).
 

packages/web/src/content/docs/troubleshooting.mdx

@@ -64,7 +64,7 @@ Here are some common issues and how to resolve them.
 
 ---
 
-### opencode won't start
+### OpenCode won't start
 
 1. Check the logs for error messages
 2. Try running with `--print-logs` to see output in the terminal
@@ -74,7 +74,7 @@ Here are some common issues and how to resolve them.
 
 ### Authentication issues
 
-1. Try re-authenticating with `opencode auth login <provider>`
+1. Try re-authenticating with the `/connect` command in the TUI
 2. Check that your API keys are valid
 3. Ensure your network allows connections to the provider's API
 
@@ -113,10 +113,7 @@ To resolve this:
    rm -rf ~/.local/share/opencode
    ```
 
-3. Re-authenticate with your provider:
-   ```bash
-   opencode auth login <provider>
-   ```
+3. Re-authenticate with your provider using the `/connect` command in the TUI.
 
 ---
 

packages/web/src/content/docs/tui.mdx

@@ -69,6 +69,16 @@ Here are all available slash commands:
 
 ---
 
+### connect
+
+Add a provider to OpenCode. Allows you to select from available providers and add their API keys.
+
+```bash frame="none"
+/connect
+```
+
+---
+
 ### compact
 
 Compact the current session. _Alias_: `/summarize`

packages/web/src/content/docs/zen.mdx

@@ -51,7 +51,7 @@ OpenCode Zen works like any other provider in OpenCode.
 
 1. You sign in to **<a href={console}>OpenCode Zen</a>**, add your billing
    details, and copy your API key.
-2. You run `opencode auth login`, select opencode, and paste your API key.
+2. You run the `/connect` command in the TUI, select OpenCode Zen, and paste your API key.
 3. Run `/models` in the TUI to see the list of models we recommend.
 
 You are charged per request and you can add credits to your account.