feat: add automatic greeting upon connection (#42)

### Explanation

_No response_

### Issue

Closes #23

### 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: #42
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

src/lib/components/ConfigSidebar.svelte

@@ -9,6 +9,8 @@
     mcp_servers_json: null,
     auto_granted_tools: [],
     theme: "dark",
+    greeting_enabled: true,
+    greeting_custom_prompt: null,
   });
 
   let isOpen = $state(false);
@@ -220,6 +222,44 @@
       </div>
     </section>
 
+    <!-- Greeting Section -->
+    <section class="mb-6">
+      <h3 class="text-sm font-medium text-[var(--accent-primary)] uppercase tracking-wider mb-3">
+        Greeting
+      </h3>
+
+      <!-- Enable/Disable Toggle -->
+      <div class="mb-4">
+        <label class="flex items-center gap-3 cursor-pointer">
+          <input
+            type="checkbox"
+            bind:checked={config.greeting_enabled}
+            class="w-4 h-4 rounded border-[var(--border-color)] bg-[var(--bg-primary)] text-[var(--accent-primary)] focus:ring-[var(--accent-primary)]"
+          />
+          <span class="text-sm text-gray-300">Send greeting on connect</span>
+        </label>
+        <p class="text-xs text-gray-500 mt-1 ml-7">
+          Automatically greet you when a session starts with time-based messages
+        </p>
+      </div>
+
+      <!-- Custom Greeting Prompt -->
+      {#if config.greeting_enabled}
+        <div class="mb-4">
+          <label for="greeting-prompt" class="block text-sm text-gray-400 mb-1">
+            Custom Greeting Prompt <span class="text-gray-600">(optional)</span>
+          </label>
+          <textarea
+            id="greeting-prompt"
+            bind:value={config.greeting_custom_prompt}
+            rows="3"
+            placeholder="Leave empty for time-based greetings, or customize how you'd like to be greeted..."
+            class="w-full px-3 py-2 bg-[var(--bg-primary)] border border-[var(--border-color)] rounded-lg text-[var(--text-primary)] focus:outline-none focus:border-[var(--accent-primary)] resize-none"
+          ></textarea>
+        </div>
+      {/if}
+    </section>
+
     <!-- MCP Servers Section -->
     <section class="mb-6">
       <h3 class="text-sm font-medium text-[var(--accent-primary)] uppercase tracking-wider mb-3">

src/lib/components/StatusBar.svelte

@@ -23,6 +23,8 @@
     mcp_servers_json: null,
     auto_granted_tools: [],
     theme: "dark",
+    greeting_enabled: true,
+    greeting_custom_prompt: null,
   });
 
   onMount(async () => {

src/lib/stores/config.ts

@@ -10,6 +10,8 @@ export interface HikariConfig {
   mcp_servers_json: string | null;
   auto_granted_tools: string[];
   theme: Theme;
+  greeting_enabled: boolean;
+  greeting_custom_prompt: string | null;
 }
 
 const defaultConfig: HikariConfig = {
@@ -19,6 +21,8 @@ const defaultConfig: HikariConfig = {
   mcp_servers_json: null,
   auto_granted_tools: [],
   theme: "dark",
+  greeting_enabled: true,
+  greeting_custom_prompt: null,
 };
 
 function createConfigStore() {

src/lib/tauri.ts

@@ -1,6 +1,8 @@
 import { listen } from "@tauri-apps/api/event";
+import { invoke } from "@tauri-apps/api/core";
 import { claudeStore } from "$lib/stores/claude";
 import { characterState } from "$lib/stores/character";
+import { configStore } from "$lib/stores/config";
 import type { ConnectionStatus, PermissionPromptEvent } from "$lib/types/messages";
 import type { CharacterState } from "$lib/types/states";
 
@@ -9,6 +11,46 @@ interface StateChangePayload {
   tool_name: string | null;
 }
 
+function getTimeOfDay(): string {
+  const hour = new Date().getHours();
+
+  if (hour >= 5 && hour < 12) {
+    return "morning";
+  } else if (hour >= 12 && hour < 17) {
+    return "afternoon";
+  } else if (hour >= 17 && hour < 21) {
+    return "evening";
+  } else {
+    return "late night";
+  }
+}
+
+function generateGreetingPrompt(): string {
+  const timeOfDay = getTimeOfDay();
+  return `[System: A new session has started. It's currently ${timeOfDay}. Please greet the user warmly and briefly. Keep it short - just 1-2 sentences.]`;
+}
+
+async function sendGreeting() {
+  const config = configStore.getConfig();
+
+  if (!config.greeting_enabled) {
+    return;
+  }
+
+  const greetingPrompt = config.greeting_custom_prompt?.trim() || generateGreetingPrompt();
+
+  // Don't show the system prompt in the UI - just trigger Claude to respond
+  characterState.setState("thinking");
+
+  try {
+    await invoke("send_prompt", { message: greetingPrompt });
+  } catch (error) {
+    console.error("Failed to send greeting:", error);
+    claudeStore.addLine("error", `Failed to send greeting: ${error}`);
+    characterState.setTemporaryState("error", 3000);
+  }
+}
+
 interface OutputPayload {
   line_type: string;
   content: string;
@@ -16,13 +58,15 @@ interface OutputPayload {
 }
 
 export async function initializeTauriListeners() {
-  await listen<string>("claude:connection", (event) => {
+  await listen<string>("claude:connection", async (event) => {
     const status = event.payload as ConnectionStatus;
     claudeStore.setConnectionStatus(status);
 
     if (status === "connected") {
       claudeStore.addLine("system", "Connected to Claude Code");
       characterState.setState("idle");
+      // Send greeting when connection is established
+      await sendGreeting();
     } else if (status === "disconnected") {
       claudeStore.addLine("system", "Disconnected from Claude Code");
       characterState.setState("idle");