chore: version 0.30.0a1, remove dead comms/panel/app code

- Version tracks Rerun base: 0.30.0a1 (based on Rerun 0.30.0-alpha.1)
- Remove comms/ (689 lines TCP protocol, unused)
- Remove panel.rs (demo UI wrapper, unused)
- Remove app.rs (demo app binary, already removed from Cargo.toml)
- lib.rs now only exports interaction module

Author: spomichter

examples/rust/custom_callback/README.md

@@ -61,7 +61,7 @@ Click events are published on the LCM channel `/clicked_point#geometry_msgs.Poin
 
 ## Versioning
 
-dimos-viewer uses independent semantic versioning starting at 0.1.0.
+dimos-viewer tracks Rerun's version. Version 0.30.0a1 is based on Rerun 0.30.0-alpha.1.
 
 | dimos-viewer | Based on Rerun |
 |-------------|----------------|

examples/rust/custom_callback/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "maturin"
 
 [project]
 name = "dimos-viewer"
-version = "0.1.0"
+version = "0.30.0a1"
 description = "Interactive Rerun viewer for DimOS with click-to-navigate support"
 readme = "README.md"
 requires-python = ">=3.10"