[FEATURE] Add a progress bar for `claude update` and `claude upgrade` commands.

### Preflight Checklist

- [x] I have searched [existing requests](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20label%3Aenhancement) and this feature hasn't been requested yet
- [x] This is a single feature request (not multiple features)

### Problem Statement

When I run update command it only shows the version it's updating to but I have no idea when will it finish, a progress bar would help a lot.

### Proposed Solution

Add an additional line below:
Downloading... 67%
There can be more status:
Pending...
Installing... 100%
Applying... 34%

### Alternative Solutions

_No response_

### Priority

Medium - Would be very helpful

### Feature Category

CLI commands and flags

### Use Case Example

_No response_

### Additional Context

_No response_

Start by locating the entry points for the `claude update` and `claude upgrade` commands and trace their download, installation, and application stages. Define completion as showing progress and status updates such as Pending, Downloading, Installing, and Applying while each command runs.

Written by the indexing model from the issue text.