feat: wire evil-keys dispatcher into event loop and action handlers

Replace 3 hardcoded keys with full trie-based dispatch. Dispatcher created
in main.rs, handle_action() implements all 18 AppAction variants including
GotoFirst/GotoLast per focus pane, NextTab/PrevTab cycling, and HalfPage scroll.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/claude-agent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Cargo.toml

@@ -1,3 +1,6 @@
+[workspace]
+members = ["crates/evil-keys"]
+
 [package]
 name = "ui-agregator"
 version = "0.1.0"
@@ -10,6 +13,7 @@ color-eyre = "0.6"
 nix = { version = "0.29", features = ["fs"] }
 serde = { version = "1", features = ["derive"] }
 serde_yaml = "0.9"
+evil-keys = { path = "crates/evil-keys" }
 
 tonic = "0.12"
 prost = "0.13"