feat: stats and achievements (#45)

### Explanation

_No response_

### Issue

Closes #39

### 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

_No response_

### Versioning

_No response_

Reviewed-on: #45
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

src/lib/components/StatusBar.svelte

@@ -1,4 +1,10 @@
 <script lang="ts">
+  interface Props {
+    onToggleAchievements?: () => void;
+  }
+
+  const { onToggleAchievements = () => {} }: Props = $props();
+
   import { invoke } from "@tauri-apps/api/core";
   import { getVersion } from "@tauri-apps/api/app";
   import { open } from "@tauri-apps/plugin-dialog";
@@ -7,6 +13,8 @@
   import { configStore, type HikariConfig } from "$lib/stores/config";
   import type { ConnectionStatus } from "$lib/types/messages";
   import { onMount } from "svelte";
+  import StatsDisplay from "./StatsDisplay.svelte";
+  import { achievementProgress } from "$lib/stores/achievements";
 
   const DISCORD_URL = "https://chat.nhcarrigan.com";
 
@@ -16,6 +24,8 @@
   let isConnecting = $state(false);
   let grantedToolsList: string[] = $state([]);
   let appVersion = $state("");
+  let showStats = $state(false);
+  const progress = $derived($achievementProgress);
   let currentConfig: HikariConfig = $state({
     model: null,
     api_key: null,
@@ -126,6 +136,10 @@
         return "Disconnected";
     }
   }
+
+  function toggleAchievements() {
+    onToggleAchievements();
+  }
 </script>
 
 <div
@@ -167,6 +181,36 @@
   </div>
 
   <div class="flex items-center gap-3">
+    <button
+      onclick={toggleAchievements}
+      class="p-1 text-gray-500 hover:text-[var(--accent-primary)] transition-colors relative"
+      title="Achievements"
+    >
+      <span class="text-lg">🏆</span>
+      {#if progress.unlocked > 0}
+        <span
+          class="absolute -top-1 -right-1 bg-[var(--accent-primary)] text-white text-xs rounded-full w-4 h-4 flex items-center justify-center text-[10px]"
+        >
+          {progress.unlocked}
+        </span>
+      {/if}
+    </button>
+    <button
+      onclick={() => (showStats = !showStats)}
+      class="p-1 text-gray-500 hover:text-[var(--accent-primary)] transition-colors {showStats
+        ? 'text-[var(--accent-primary)]'
+        : ''}"
+      title="Usage Stats"
+    >
+      <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M9 19v-6a2 2 0 00-2-2H5a2 2 0 00-2 2v6a2 2 0 002 2h2a2 2 0 002-2zM13 19v-4a2 2 0 00-2-2H9a2 2 0 00-2 2v4a2 2 0 002 2h2a2 2 0 002-2zM21 19V8a2 2 0 00-2-2h-2a2 2 0 00-2 2v11a2 2 0 002 2h2a2 2 0 002-2z"
+        />
+      </svg>
+    </button>
     <button
       onclick={configStore.openSidebar}
       class="p-1 text-gray-500 hover:text-[var(--accent-primary)] transition-colors"
@@ -201,6 +245,12 @@
     {#if appVersion}
       <span class="text-xs text-gray-600">v{appVersion}</span>
     {/if}
+
+    {#if showStats}
+      <div class="absolute top-full right-0 mt-2 mr-4 z-50">
+        <StatsDisplay />
+      </div>
+    {/if}
     {#if connectionStatus === "connected"}
       <button
         onclick={handleDisconnect}
@@ -219,3 +269,12 @@
     {/if}
   </div>
 </div>
+
+{#if showStats}
+  <!-- svelte-ignore a11y_click_events_have_key_events -->
+  <!-- svelte-ignore a11y_no_static_element_interactions -->
+  <div class="fixed inset-0 z-40" onclick={() => (showStats = false)}></div>
+  <div class="fixed top-14 right-4 z-50">
+    <StatsDisplay />
+  </div>
+{/if}