### System details

Omarchy 4.0.4-1, gum 2.0.0-1, delta not installed, default `core.pager`

### What's wrong?

Without `delta`, `omarchy plugin update <id>` prints the diff with an unpiped `git diff`, so git opens its own pager. The `gum confirm "Update <id>?"` prompt then waits behind the pager, invisible. Enter scrolls one line inside `less`, so the update looks stuck with no sign that a keypress is expected. Quitting the pager with `q` reveals the prompt.

With `delta` installed the diff is piped, git disables its pager, and the prompt appears right away, so only installs without `delta` are affected.

`bin/omarchy-plugin-update`:

```sh
if omarchy-cmd-present delta; then
  git -C "$dir" diff HEAD FETCH_HEAD | delta --paging=never
else
  git -C "$dir" diff HEAD FETCH_HEAD    # git pages this
fi
```

### Steps to reproduce

1. Install a git-managed plugin and let it fall behind its upstream.
2. Run `omarchy plugin update <id>` in a terminal.
3. The diff fills the screen and nothing else happens; Enter scrolls one line at a time.
4. Press `q`: the confirm prompt appears.

### Expected

The diff is shown without a pager, as on the `delta` path, so the confirm prompt is visible.

### Suggested fix

One word, so both paths behave the same:

```sh
git -C "$dir" --no-pager diff HEAD FETCH_HEAD
```

`bin/omarchy-plugin-add` prints no diff, so this is the only place affected. Happy to send the patch as a pull request if that helps.

### Workarounds

`--yes`, `GIT_PAGER=cat omarchy plugin update <id>`, or pressing `q` at the pager.