feat: custom background image with opacity control

src-tauri/src/config.rs

@@ -128,6 +128,13 @@ pub struct HikariConfig {
 
     #[serde(default)]
     pub trusted_workspaces: Vec<String>,
+
+    // Background image settings
+    #[serde(default)]
+    pub background_image_path: Option<String>,
+
+    #[serde(default = "default_background_image_opacity")]
+    pub background_image_opacity: f32,
 }
 
 impl Default for HikariConfig {
@@ -163,6 +170,8 @@ impl Default for HikariConfig {
             use_worktree: false,
             disable_1m_context: false,
             trusted_workspaces: Vec::new(),
+            background_image_path: None,
+            background_image_opacity: 0.3,
         }
     }
 }
@@ -199,6 +208,10 @@ fn default_discord_rpc_enabled() -> bool {
     true
 }
 
+fn default_background_image_opacity() -> f32 {
+    0.3
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize, Default, PartialEq)]
 #[serde(rename_all = "lowercase")]
 pub enum BudgetAction {
@@ -308,6 +321,8 @@ mod tests {
             use_worktree: true,
             disable_1m_context: false,
             trusted_workspaces: vec!["/home/naomi/projects/trusted".to_string()],
+            background_image_path: Some("/home/naomi/bg.png".to_string()),
+            background_image_opacity: 0.25,
         };
 
         let json = serde_json::to_string(&config).unwrap();