feat: multiple UI improvements, font settings, and memory file display names (#175)

## Summary

- **fix**: `show_thinking_blocks` setting now persists across sessions — it was defined on the TypeScript side but missing from the Rust `HikariConfig` struct, so serde silently dropped it on every save/load
- **feat**: Tool calls are now rendered as collapsible blocks matching the Extended Thinking block aesthetic, replacing the old inline dropdown approach
- **feat**: Add configurable max output tokens setting
- **feat**: Use random creative names for conversation tabs
- **test**: Significantly expanded frontend unit test coverage
- **docs**: Require tests for all changes in CLAUDE.md
- **feat**: Allow users to specify a custom terminal font (Closes #176)
- **feat**: Display friendly names for memory files derived from the first heading (Closes #177)
- **feat**: Add custom UI font support for the app chrome (buttons, labels, tabs)
- **fix**: Apply custom UI font to the full app interface — `.app-container` was hardcoded, blocking inheritance from `body`; also renamed "Custom Font" to "Custom Terminal Font" for clarity

✨ This PR was created with help from Hikari~ 🌸

Reviewed-on: #175
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

src/lib/notifications/terminalNotifier.test.ts

@@ -0,0 +1,64 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { NotificationType } from "./types";
+import { claudeStore } from "$lib/stores/claude";
+import { sendTerminalNotification } from "./terminalNotifier";
+
+vi.mock("$lib/stores/claude", () => ({
+  claudeStore: {
+    addLine: vi.fn(),
+  },
+}));
+
+describe("sendTerminalNotification", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("adds a system line for success type with sparkle emoji", () => {
+    sendTerminalNotification(NotificationType.SUCCESS);
+
+    expect(claudeStore.addLine).toHaveBeenCalledWith("system", expect.stringContaining("✨"));
+  });
+
+  it("adds a system line for error type with cross emoji", () => {
+    sendTerminalNotification(NotificationType.ERROR);
+
+    expect(claudeStore.addLine).toHaveBeenCalledWith("system", expect.stringContaining("❌"));
+  });
+
+  it("adds a system line for permission type with lock emoji", () => {
+    sendTerminalNotification(NotificationType.PERMISSION);
+
+    expect(claudeStore.addLine).toHaveBeenCalledWith("system", expect.stringContaining("🔐"));
+  });
+
+  it("adds a system line for connection type with link emoji", () => {
+    sendTerminalNotification(NotificationType.CONNECTION);
+
+    expect(claudeStore.addLine).toHaveBeenCalledWith("system", expect.stringContaining("🔗"));
+  });
+
+  it("adds a system line for task_start type with rocket emoji", () => {
+    sendTerminalNotification(NotificationType.TASK_START);
+
+    expect(claudeStore.addLine).toHaveBeenCalledWith("system", expect.stringContaining("🚀"));
+  });
+
+  it("includes the optional message in the notification", () => {
+    sendTerminalNotification(NotificationType.SUCCESS, "Custom message text");
+
+    expect(claudeStore.addLine).toHaveBeenCalledWith(
+      "system",
+      expect.stringContaining("Custom message text")
+    );
+  });
+
+  it("includes the sound phrase as the notification title", () => {
+    sendTerminalNotification(NotificationType.SUCCESS);
+
+    expect(claudeStore.addLine).toHaveBeenCalledWith(
+      "system",
+      expect.stringContaining("I'm done!")
+    );
+  });
+});