feat(config): add currency symbol and conversion rate to rprompt

crates/forge_config/.forge.toml

@@ -64,3 +64,6 @@ frequency = "daily"
 [reasoning]
 enabled = true
 effort = "high"
+
+currency_symbol = "$"
+currency_conversion_rate = 1.0

crates/forge_config/src/config.rs

@@ -265,6 +265,17 @@ pub struct ForgeConfig {
     /// selection.
     #[serde(default, skip_serializing_if = "Vec::is_empty")]
     pub providers: Vec<ProviderEntry>,
+
+    /// Currency symbol displayed in the shell rprompt next to the session cost
+    /// (e.g. `"$"`, `"€"`, `"₹"`). Defaults to `"$"`.
+    #[serde(default)]
+    pub currency_symbol: String,
+
+    /// Conversion rate applied to costs before display in the shell rprompt.
+    /// The raw USD cost is multiplied by this value, allowing costs to be shown
+    /// in a local currency. Defaults to `1.0` (no conversion).
+    #[serde(default)]
+    pub currency_conversion_rate: Decimal,
 }
 
 impl ForgeConfig {

crates/forge_main/src/ui.rs

@@ -3761,17 +3761,7 @@ impl<A: API + ConsoleWriter + 'static, F: Fn(ForgeConfig) -> A + Send + Sync> UI
             .map(|val| val == "1")
             .unwrap_or(true); // Default to true
 
-        // Get currency symbol from environment variable, default to "$"
-        let currency_symbol =
-            std::env::var("FORGE_CURRENCY_SYMBOL").unwrap_or_else(|_| "$".to_string());
-
-        // Get conversion ratio from environment variable, default to 1.0
-        let conversion_ratio = std::env::var("FORGE_CURRENCY_CONVERSION_RATE")
-            .ok()
-            .and_then(|val| val.parse::<f64>().ok())
-            .unwrap_or(1.0);
-
-        let rprompt = ZshRPrompt::default()
+        let rprompt = ZshRPrompt::from_config(&self.config)
             .agent(
                 std::env::var("_FORGE_ACTIVE_AGENT")
                     .ok()
@@ -3781,9 +3771,7 @@ impl<A: API + ConsoleWriter + 'static, F: Fn(ForgeConfig) -> A + Send + Sync> UI
             .model(model_id)
             .token_count(conversation.and_then(|conversation| conversation.token_count()))
             .cost(cost)
-            .use_nerd_font(use_nerd_font)
-            .currency_symbol(currency_symbol)
-            .conversion_ratio(conversion_ratio);
+            .use_nerd_font(use_nerd_font);
 
         Some(rprompt.to_string())
     }

crates/forge_main/src/zsh/rprompt.rs

@@ -7,6 +7,7 @@ use std::fmt::{self, Display};
 
 use convert_case::{Case, Casing};
 use derive_setters::Setters;
+use forge_config::ForgeConfig;
 use forge_domain::{AgentId, ModelId, TokenCount};
 
 use super::style::{ZshColor, ZshStyle};
@@ -34,6 +35,16 @@ pub struct ZshRPrompt {
     /// Defaults to 1.0.
     conversion_ratio: f64,
 }
+impl ZshRPrompt {
+    /// Constructs a [`ZshRPrompt`] with currency settings populated from the
+    /// provided [`ForgeConfig`].
+    pub fn from_config(config: &ForgeConfig) -> Self {
+        Self::default()
+            .currency_symbol(config.currency_symbol.clone())
+            .conversion_ratio(config.currency_conversion_rate.value())
+    }
+}
+
 impl Default for ZshRPrompt {
     fn default() -> Self {
         Self {

forge.schema.json

@@ -42,6 +42,16 @@
         }
       ]
     },
+    "currency_conversion_rate": {
+      "description": "Conversion rate applied to costs before display in the shell rprompt.\nThe raw USD cost is multiplied by this value, allowing costs to be shown\nin a local currency. Defaults to `1.0` (no conversion).",
+      "$ref": "#/$defs/double",
+      "default": 0.0
+    },
+    "currency_symbol": {
+      "description": "Currency symbol displayed in the shell rprompt next to the session cost\n(e.g. `\"$\"`, `\"€\"`, `\"₹\"`). Defaults to `\"$\"`.",
+      "type": "string",
+      "default": ""
+    },
     "custom_history_path": {
       "description": "Path to the conversation history file; defaults to the global history\nlocation when absent.",
       "type": [