feat: add ability to run multiple agents via tabbed views (#47)

### Explanation

_No response_

### Issue

Closes #30 Closes #41

### Attestations

- [ ] I have read and agree to the [Code of Conduct](https://docs.nhcarrigan.com/community/coc/)
- [ ] I have read and agree to the [Community Guidelines](https://docs.nhcarrigan.com/community/guide/).
- [ ] My contribution complies with the [Contributor Covenant](https://docs.nhcarrigan.com/dev/covenant/).

### Dependencies

- [ ] I have pinned the dependencies to a specific patch version.

### Style

- [ ] I have run the linter and resolved any errors.
- [ ] My pull request uses an appropriate title, matching the conventional commit standards.
- [ ] My scope of feat/fix/chore/etc. correctly matches the nature of changes in my pull request.

### Tests

- [ ] My contribution adds new code, and I have added tests to cover it.
- [ ] My contribution modifies existing code, and I have updated the tests to reflect these changes.
- [ ] All new and existing tests pass locally with my changes.
- [ ] Code coverage remains at or above the configured threshold.

### Documentation

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### Versioning

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Reviewed-on: #47
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

src/routes/+page.svelte

@@ -2,6 +2,7 @@
   import { onMount, onDestroy } from "svelte";
   import { initializeTauriListeners, cleanupTauriListeners } from "$lib/tauri";
   import { configStore, applyTheme } from "$lib/stores/config";
+  import { conversationsStore } from "$lib/stores/conversations";
   import "$lib/notifications/testNotifications";
   import Terminal from "$lib/components/Terminal.svelte";
   import InputBar from "$lib/components/InputBar.svelte";
@@ -18,6 +19,10 @@
   onMount(async () => {
     if (!initialized) {
       initialized = true;
+
+      // Initialize conversations store first to ensure activeConversationId is set
+      conversationsStore.initialize();
+
       await initializeTauriListeners();
       await configStore.loadConfig();