feat: add discord rich presence (#105)

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- [ ] I have read and agree to the [Community Guidelines](https://docs.nhcarrigan.com/community/guide/).
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- [ ] I have pinned the dependencies to a specific patch version.

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### Tests

- [ ] My contribution adds new code, and I have added tests to cover it.
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Reviewed-on: #105
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

src/lib/components/StatusBar.svelte

@@ -30,6 +30,7 @@
     createSummary,
     sanitizeForJson,
   } from "$lib/utils/conversationUtils";
+  import { updateDiscordRpc } from "$lib/tauri";
 
   const DISCORD_URL = "https://chat.nhcarrigan.com";
   const DONATE_URL = "https://donate.nhcarrigan.com";
@@ -86,6 +87,7 @@
     session_cost_budget: null,
     budget_action: "warn",
     budget_warning_threshold: 0.8,
+    discord_rpc_enabled: true,
   });
 
   let streamerModeActive = $state(false);
@@ -165,6 +167,16 @@
           allowed_tools: allAllowedTools,
         },
       });
+
+      // Update Discord RPC when a new session starts
+      const activeConversation = get(conversationsStore.activeConversation);
+      if (activeConversation) {
+        await updateDiscordRpc(
+          activeConversation.name,
+          currentConfig.model || "claude",
+          activeConversation.startedAt
+        );
+      }
     } catch (error) {
       console.error("Failed to start Claude:", error);
       claudeStore.addLine("error", `Connection failed: ${error}`);