Rename binary to agent-orchestrator, add splash screen, fix white flash

- Rename Cargo package from bterminal to agent-orchestrator so WM_CLASS
  matches desktop entry and taskbar groups correctly
- Update lib name (agent_orchestrator_lib) and telemetry service name
- Add Pandora's Box splash screen with progress steps during startup
- Prevent white window flash with inline CSS and Tauri backgroundColor

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

v2/src-tauri/Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "bterminal"
+name = "agent-orchestrator"
 version = "0.1.0"
 description = "Multi-session Claude agent dashboard"
 authors = ["DexterFromLab"]
@@ -10,7 +10,7 @@ rust-version = "1.77.2"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [lib]
-name = "bterminal_lib"
+name = "agent_orchestrator_lib"
 crate-type = ["staticlib", "cdylib", "rlib"]
 
 [build-dependencies]