polish JRPG conversation experience Integrate desktop conversations into the utility panel, simplify the mobile frame, add modal destinations and a reusable Zenbu composer lab, and preserve explicit conversation resume behavior. Co-authored-by: Copilot <[email protected]>

# config

Shared Bazel build configurations and platform definitions.

## Usage

Reference in BUILD files:

```starlark
load("//config:defs.bzl", ...)
```