refactor(cua-cli): rename 'open' command to 'vnc' with backwards compatibility

Rename the VNC command from 'open' to 'vnc' for clarity and specificity.
Keep 'open' as an alias for backwards compatibility.

Changes:
- Update command definition to use 'vnc' as primary, 'open' as alias
- Update README.md to reflect new command name
- Update commands.mdx documentation with new command and alias
- Update quickstart.mdx to use 'cua sb vnc'
- Update command examples in tips section

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

docs/content/docs/get-started/quickstart.mdx

@@ -500,7 +500,7 @@ You can now interact with your sandbox in multiple ways:
 #### Option 1: Access VNC Desktop
 
 ```bash
-cua sb open my-sandbox-abc123
+cua sb vnc my-sandbox-abc123
 ```
 
 This opens a remote desktop connection to your sandbox.

docs/content/docs/libraries/cua-cli/commands.mdx

@@ -33,7 +33,7 @@ Both styles work identically - use whichever you prefer!
 ### Available Commands
 
 - **Authentication** - `cua login`, `cua env`, `cua logout`
-- **Sandbox Management** - `cua list`, `cua create`, `cua start`, `cua stop`, `cua restart`, `cua delete`, `cua open`
+- **Sandbox Management** - `cua list`, `cua create`, `cua start`, `cua stop`, `cua restart`, `cua delete`, `cua vnc`
 
 ## Authentication Commands
 
@@ -225,17 +225,20 @@ Sandbox deletion initiated: deleting
   This action is irreversible. All data on the sandbox will be permanently lost.
 </Callout>
 
-### `cua open`
+### `cua vnc`
 
 Open the VNC interface for a sandbox in your browser.
 
 ```bash
+cua vnc <name>
+
+# Alternative alias
 cua open <name>
 ```
 
 **Example:**
 ```bash
-$ cua open my-dev-sandbox
+$ cua vnc my-dev-sandbox
 Opening NoVNC: https://my-dev-sandbox.containers.cloud.trycua.com/vnc.html?autoconnect=true&password=...
 ```
 
@@ -301,8 +304,8 @@ cua env
 ### 3. Quick Sandbox Access
 ```bash
 # Create aliases for frequently used sandboxes
-alias dev-sandbox="cua open my-development-sandbox"
-alias prod-sandbox="cua open my-production-sandbox"
+alias dev-sandbox="cua vnc my-development-sandbox"
+alias prod-sandbox="cua vnc my-production-sandbox"
 ```
 
 ### 4. Monitoring Provisioning

libs/typescript/cua-cli/README.md

@@ -50,7 +50,7 @@ bun run ./index.ts -- --help
   - `start <name>` – start a stopped sandbox
   - `stop <name>` – stop a running sandbox
   - `restart <name>` – restart a sandbox
-  - `open <name>` – open NoVNC URL in your browser
+  - `vnc <name>` (alias: `open`) – open VNC desktop in your browser
 
 ## Auth Flow (Dynamic Callback Port)
 

libs/typescript/cua-cli/src/commands/sandbox.ts

@@ -290,8 +290,8 @@ export function registerSandboxCommands(y: Argv) {
       restartHandler
     )
     .command(
-      'open <name>',
-      'Open NoVNC for a sandbox in your browser',
+      ['vnc <name>', 'open <name>'],
+      'Open VNC desktop for a sandbox',
       (y) => y.positional('name', { type: 'string', describe: 'Sandbox name' }),
       openHandler
     );
@@ -368,8 +368,8 @@ export function registerSandboxCommands(y: Argv) {
           restartHandler
         )
         .command(
-          'open <name>',
-          'Open NoVNC for a sandbox in your browser',
+          ['vnc <name>', 'open <name>'],
+          'Open VNC desktop for a sandbox',
           (y) => y.positional('name', { type: 'string', describe: 'Sandbox name' }),
           openHandler
         )