fix: ensure permission/stats persist until explicit disconnect (#110)

Also includes cached tokens in cost calculations to provide more accurate billing estimates.

Reviewed-on: #110
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

src-tauri/src/types.rs

@@ -4,6 +4,10 @@ use serde::{Deserialize, Serialize};
 pub struct UsageInfo {
     pub input_tokens: u64,
     pub output_tokens: u64,
+    #[serde(default)]
+    pub cache_creation_input_tokens: Option<u64>,
+    #[serde(default)]
+    pub cache_read_input_tokens: Option<u64>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default)]