feat: major feature additions and improvements (#135)

## Summary

This PR includes major feature additions, bug fixes, comprehensive testing improvements, and responsive design enhancements!

## New Features ✨

### Plugin & MCP Management (#133, #134)
- **Plugin Management Panel**: Install, uninstall, enable/disable, and update plugins
- **MCP Server Management Panel**: Add/remove MCP servers, view detailed configuration
- **Marketplace Management**: Add/remove plugin marketplaces from GitHub
- Backend commands for full CLI integration (`list_plugins`, `install_plugin`, `add_mcp_server`, etc.)
- Beautiful UI with proper loading states, error handling, and theme support

### Visual Todo List Panel (#132)
- Real-time todo list display when Hikari uses the `TodoWrite` tool
- Shows pending/in-progress/completed status with visual indicators
- Progress bar and completion count
- Automatically clears on disconnect
- Theme-aware styling

### Clear Session History Button (#130)
- "Clear All Sessions" button in Session History panel
- Confirmation dialog with session count
- Keyboard support and accessibility features
- Gives users control over disk usage

### CLI Version Display (#131)
- Displays Claude CLI version in status bar
- Auto-polls every 30 seconds for updates
- Useful for debugging and feature compatibility

## Bug Fixes 🐛

### Stats Panel Scrolling (#136)
- **Fixed stats panel overflow**: Added scrollable container with `max-height` constraint
- Stats panel now scrolls when content (Tools Used, Historical Costs, Budget sections) gets too long
- Prevents content from overflowing off screen

### Agent Monitor Fixes (#122)
- **Fixed agents stuck in "running" state**: Added `SubagentStop` hook parsing
- **Fixed agents persisting after disconnect**: Call `clearConversation()` on disconnect
- **Fixed "Kill All" button**: Now properly marks all agents as errored
- **Fixed badge persisting after tab close**: Cleanup agents when conversation is deleted
- Comprehensive tests for agent lifecycle management

### Discord RPC Cleanup (#129)
- Removed file-based logging for Discord RPC
- Replaced with proper `tracing` framework usage
- Reduces disk usage and eliminates maintenance burden

### Close Modal Bug Fix (#128)
- Fixed close confirmation modal not triggering after Discord RPC refactor
- Removed frontend calls to deleted `log_discord_rpc` command
- Modal now works correctly after all operations

### Responsive Design Fixes (#118)
- Fixed top navigation icons getting cut off at small screen widths
- Fixed Connect button disappearing on narrow screens
- Fixed bottom status info (clock, CLI version) getting cut off
- Added flex-wrap and mobile-optimised layouts
- Icons-only mode on screens < 640px
- Vertical stacking on screens < 768px

## Testing Improvements 🧪

### Comprehensive Test Coverage (#114)
- **417 backend tests** (up from 408)
- **387 frontend tests** (up from 363)
- **61%+ backend code coverage**
- Added E2E integration tests for cross-platform notification commands
- New test files: `agents.test.ts`, comprehensive CLI parsing tests
- Tests for `debug_logger.rs`, `bridge_manager.rs`, `notifications.rs`
- Console mocking for cleaner test output
- Fixed flaky frontend tests

### Testing Documentation
- Updated CLAUDE.md with comprehensive testing guidelines
- Documented mocking approaches (console mocking, E2E command structure testing)
- Added step-by-step guide for adding tests to new features
- Goal to maintain ~100% test coverage documented

## Closes

Closes #114
Closes #118
Closes #122
Closes #128
Closes #129
Closes #130
Closes #131
Closes #132
Closes #133
Closes #134
Closes #136

## Technical Details

- All new backend commands properly registered in `lib.rs`
- CLI output parsing with comprehensive test coverage
- Cross-platform compatibility verified through E2E tests (Linux CI can test Windows commands)
- Theme-aware UI components using CSS variables throughout
- Proper TypeScript types for all new stores and components
- ESLint and Prettier compliant
- All Clippy warnings addressed

✨ This PR was created with help from Hikari~ 🌸

Reviewed-on: #135
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

src/lib/stores/agents.test.ts

@@ -0,0 +1,325 @@
+import { describe, it, expect, beforeEach } from "vitest";
+import { agentStore, getAgentsForConversation, runningAgentCount } from "./agents";
+import { get } from "svelte/store";
+import type { AgentInfo } from "$lib/types/agents";
+
+describe("agents store", () => {
+  const conversationId = "test-conversation-1";
+  const otherConversationId = "test-conversation-2";
+
+  const createMockAgent = (overrides?: Partial<AgentInfo>): AgentInfo => ({
+    toolUseId: "toolu_test123",
+    description: "Test agent",
+    subagentType: "Explore",
+    startedAt: Date.now(),
+    status: "running",
+    ...overrides,
+  });
+
+  beforeEach(() => {
+    // Clear all conversations by subscribing and getting state
+    let state: Record<string, AgentInfo[]> = {};
+    const unsub = agentStore.subscribe((s) => {
+      state = s;
+    });
+    unsub();
+
+    // Clear each conversation
+    for (const convId of Object.keys(state)) {
+      agentStore.clearConversation(convId);
+    }
+  });
+
+  describe("addAgent", () => {
+    it("adds an agent to a conversation", () => {
+      const agent = createMockAgent();
+      agentStore.addAgent(conversationId, agent);
+
+      const agents = get(getAgentsForConversation(conversationId));
+      expect(agents).toHaveLength(1);
+      expect(agents[0]).toEqual(agent);
+    });
+
+    it("adds multiple agents to the same conversation", () => {
+      const agent1 = createMockAgent({ toolUseId: "tool1" });
+      const agent2 = createMockAgent({ toolUseId: "tool2" });
+
+      agentStore.addAgent(conversationId, agent1);
+      agentStore.addAgent(conversationId, agent2);
+
+      const agents = get(getAgentsForConversation(conversationId));
+      expect(agents).toHaveLength(2);
+      expect(agents[0]).toEqual(agent1);
+      expect(agents[1]).toEqual(agent2);
+    });
+
+    it("keeps agents in different conversations separate", () => {
+      const agent1 = createMockAgent({ toolUseId: "tool1" });
+      const agent2 = createMockAgent({ toolUseId: "tool2" });
+
+      agentStore.addAgent(conversationId, agent1);
+      agentStore.addAgent(otherConversationId, agent2);
+
+      const agents1 = get(getAgentsForConversation(conversationId));
+      const agents2 = get(getAgentsForConversation(otherConversationId));
+
+      expect(agents1).toHaveLength(1);
+      expect(agents2).toHaveLength(1);
+      expect(agents1[0]).toEqual(agent1);
+      expect(agents2[0]).toEqual(agent2);
+    });
+  });
+
+  describe("updateAgentId", () => {
+    it("updates the agent_id for a specific agent", () => {
+      const agent = createMockAgent({ agentId: undefined });
+      agentStore.addAgent(conversationId, agent);
+
+      agentStore.updateAgentId(conversationId, agent.toolUseId, "agent-abc123");
+
+      const agents = get(getAgentsForConversation(conversationId));
+      expect(agents[0].agentId).toBe("agent-abc123");
+    });
+
+    it("does nothing if conversation doesn't exist", () => {
+      agentStore.updateAgentId("nonexistent", "tool1", "agent1");
+      // Should not throw
+      expect(true).toBe(true);
+    });
+
+    it("does nothing if tool_use_id doesn't exist", () => {
+      const agent = createMockAgent();
+      agentStore.addAgent(conversationId, agent);
+
+      agentStore.updateAgentId(conversationId, "nonexistent-tool", "agent1");
+
+      const agents = get(getAgentsForConversation(conversationId));
+      expect(agents[0].agentId).toBeUndefined();
+    });
+  });
+
+  describe("endAgent", () => {
+    it("marks an agent as completed", () => {
+      const agent = createMockAgent({ status: "running" });
+      agentStore.addAgent(conversationId, agent);
+
+      const endTime = Date.now();
+      agentStore.endAgent(conversationId, agent.toolUseId, endTime, false);
+
+      const agents = get(getAgentsForConversation(conversationId));
+      expect(agents[0].status).toBe("completed");
+      expect(agents[0].endedAt).toBe(endTime);
+      expect(agents[0].durationMs).toBeGreaterThanOrEqual(0); // Duration can be 0 if timestamps are the same
+    });
+
+    it("marks an agent as errored", () => {
+      const agent = createMockAgent({ status: "running" });
+      agentStore.addAgent(conversationId, agent);
+
+      const endTime = Date.now();
+      agentStore.endAgent(conversationId, agent.toolUseId, endTime, true);
+
+      const agents = get(getAgentsForConversation(conversationId));
+      expect(agents[0].status).toBe("errored");
+      expect(agents[0].endedAt).toBe(endTime);
+    });
+
+    it("calculates duration correctly", () => {
+      const startTime = Date.now() - 5000; // 5 seconds ago
+      const agent = createMockAgent({ startedAt: startTime, status: "running" });
+      agentStore.addAgent(conversationId, agent);
+
+      const endTime = Date.now();
+      agentStore.endAgent(conversationId, agent.toolUseId, endTime, false);
+
+      const agents = get(getAgentsForConversation(conversationId));
+      expect(agents[0].durationMs).toBeGreaterThanOrEqual(5000);
+      expect(agents[0].durationMs).toBeLessThanOrEqual(6000); // Allow some buffer
+    });
+
+    it("does nothing if conversation doesn't exist", () => {
+      agentStore.endAgent("nonexistent", "tool1", Date.now(), false);
+      // Should not throw
+      expect(true).toBe(true);
+    });
+
+    it("does nothing if agent doesn't exist", () => {
+      const agent = createMockAgent();
+      agentStore.addAgent(conversationId, agent);
+
+      agentStore.endAgent(conversationId, "nonexistent-tool", Date.now(), false);
+
+      const agents = get(getAgentsForConversation(conversationId));
+      expect(agents[0].status).toBe("running"); // Status unchanged
+    });
+  });
+
+  describe("markAllErrored", () => {
+    it("marks all running agents as errored", () => {
+      const agent1 = createMockAgent({ toolUseId: "tool1", status: "running" });
+      const agent2 = createMockAgent({ toolUseId: "tool2", status: "running" });
+      const agent3 = createMockAgent({ toolUseId: "tool3", status: "completed" });
+
+      agentStore.addAgent(conversationId, agent1);
+      agentStore.addAgent(conversationId, agent2);
+      agentStore.addAgent(conversationId, agent3);
+
+      agentStore.markAllErrored(conversationId);
+
+      const agents = get(getAgentsForConversation(conversationId));
+      expect(agents[0].status).toBe("errored");
+      expect(agents[0].endedAt).toBeGreaterThan(0);
+      expect(agents[1].status).toBe("errored");
+      expect(agents[1].endedAt).toBeGreaterThan(0);
+      expect(agents[2].status).toBe("completed"); // Already completed, unchanged
+    });
+
+    it("does nothing if conversation doesn't exist", () => {
+      agentStore.markAllErrored("nonexistent");
+      // Should not throw
+      expect(true).toBe(true);
+    });
+
+    it("does nothing if conversation has no running agents", () => {
+      const agent = createMockAgent({ status: "completed" });
+      agentStore.addAgent(conversationId, agent);
+
+      agentStore.markAllErrored(conversationId);
+
+      const agents = get(getAgentsForConversation(conversationId));
+      expect(agents[0].status).toBe("completed"); // Unchanged
+    });
+  });
+
+  describe("clearCompleted", () => {
+    it("removes completed and errored agents", () => {
+      const agent1 = createMockAgent({ toolUseId: "tool1", status: "running" });
+      const agent2 = createMockAgent({ toolUseId: "tool2", status: "completed" });
+      const agent3 = createMockAgent({ toolUseId: "tool3", status: "errored" });
+
+      agentStore.addAgent(conversationId, agent1);
+      agentStore.addAgent(conversationId, agent2);
+      agentStore.addAgent(conversationId, agent3);
+
+      agentStore.clearCompleted(conversationId);
+
+      const agents = get(getAgentsForConversation(conversationId));
+      expect(agents).toHaveLength(1);
+      expect(agents[0].toolUseId).toBe("tool1"); // Only running agent remains
+    });
+
+    it("does nothing if conversation doesn't exist", () => {
+      agentStore.clearCompleted("nonexistent");
+      // Should not throw
+      expect(true).toBe(true);
+    });
+
+    it("clears all agents if all are completed", () => {
+      const agent1 = createMockAgent({ toolUseId: "tool1", status: "completed" });
+      const agent2 = createMockAgent({ toolUseId: "tool2", status: "errored" });
+
+      agentStore.addAgent(conversationId, agent1);
+      agentStore.addAgent(conversationId, agent2);
+
+      agentStore.clearCompleted(conversationId);
+
+      const agents = get(getAgentsForConversation(conversationId));
+      expect(agents).toHaveLength(0);
+    });
+  });
+
+  describe("clearConversation", () => {
+    it("removes all agents from a conversation", () => {
+      const agent1 = createMockAgent({ toolUseId: "tool1" });
+      const agent2 = createMockAgent({ toolUseId: "tool2" });
+
+      agentStore.addAgent(conversationId, agent1);
+      agentStore.addAgent(conversationId, agent2);
+
+      agentStore.clearConversation(conversationId);
+
+      const agents = get(getAgentsForConversation(conversationId));
+      expect(agents).toHaveLength(0);
+    });
+
+    it("only removes agents from the specified conversation", () => {
+      const agent1 = createMockAgent({ toolUseId: "tool1" });
+      const agent2 = createMockAgent({ toolUseId: "tool2" });
+
+      agentStore.addAgent(conversationId, agent1);
+      agentStore.addAgent(otherConversationId, agent2);
+
+      agentStore.clearConversation(conversationId);
+
+      const agents1 = get(getAgentsForConversation(conversationId));
+      const agents2 = get(getAgentsForConversation(otherConversationId));
+
+      expect(agents1).toHaveLength(0);
+      expect(agents2).toHaveLength(1);
+      expect(agents2[0]).toEqual(agent2);
+    });
+
+    it("does nothing if conversation doesn't exist", () => {
+      agentStore.clearConversation("nonexistent");
+      // Should not throw
+      expect(true).toBe(true);
+    });
+  });
+
+  describe("runningAgentCount", () => {
+    it("counts running agents across all conversations", () => {
+      const agent1 = createMockAgent({ toolUseId: "tool1", status: "running" });
+      const agent2 = createMockAgent({ toolUseId: "tool2", status: "running" });
+      const agent3 = createMockAgent({ toolUseId: "tool3", status: "completed" });
+      const agent4 = createMockAgent({ toolUseId: "tool4", status: "running" });
+
+      agentStore.addAgent(conversationId, agent1);
+      agentStore.addAgent(conversationId, agent2);
+      agentStore.addAgent(conversationId, agent3);
+      agentStore.addAgent(otherConversationId, agent4);
+
+      const count = get(runningAgentCount);
+      expect(count).toBe(3); // 2 from first conversation + 1 from second
+    });
+
+    it("returns 0 when no agents are running", () => {
+      const agent1 = createMockAgent({ status: "completed" });
+      const agent2 = createMockAgent({ status: "errored" });
+
+      agentStore.addAgent(conversationId, agent1);
+      agentStore.addAgent(otherConversationId, agent2);
+
+      const count = get(runningAgentCount);
+      expect(count).toBe(0);
+    });
+
+    it("updates when agents complete", () => {
+      const agent = createMockAgent({ status: "running" });
+      agentStore.addAgent(conversationId, agent);
+
+      let count = get(runningAgentCount);
+      expect(count).toBe(1);
+
+      agentStore.endAgent(conversationId, agent.toolUseId, Date.now(), false);
+
+      count = get(runningAgentCount);
+      expect(count).toBe(0);
+    });
+
+    it("updates when conversation is cleared", () => {
+      const agent1 = createMockAgent({ toolUseId: "tool1", status: "running" });
+      const agent2 = createMockAgent({ toolUseId: "tool2", status: "running" });
+
+      agentStore.addAgent(conversationId, agent1);
+      agentStore.addAgent(conversationId, agent2);
+
+      let count = get(runningAgentCount);
+      expect(count).toBe(2);
+
+      agentStore.clearConversation(conversationId);
+
+      count = get(runningAgentCount);
+      expect(count).toBe(0);
+    });
+  });
+});

src/lib/stores/config.test.ts

@@ -193,6 +193,7 @@ describe("config store", () => {
         budget_action: "warn",
         budget_warning_threshold: 0.8,
         discord_rpc_enabled: true,
+        show_thinking_blocks: true,
       };
 
       expect(config.model).toBe("claude-sonnet-4");
@@ -238,6 +239,7 @@ describe("config store", () => {
         budget_action: "warn",
         budget_warning_threshold: 0.8,
         discord_rpc_enabled: true,
+        show_thinking_blocks: true,
       };
 
       expect(config.model).toBeNull();
@@ -720,6 +722,9 @@ describe("config store", () => {
     it("handles save errors gracefully without losing data", async () => {
       const mockInvokeImpl = vi.mocked(invoke);
 
+      // Mock console.error to suppress expected error output
+      const consoleErrorSpy = vi.spyOn(console, "error").mockImplementation(() => {});
+
       // Set initial config
       await configStore.updateConfig({ font_size: 14 });
 
@@ -731,6 +736,12 @@ describe("config store", () => {
 
       // Original config should still be accessible
       expect(configStore.getConfig().font_size).toBe(14);
+
+      // Verify error was logged
+      expect(consoleErrorSpy).toHaveBeenCalledWith("Failed to save config:", expect.any(Error));
+
+      // Restore console.error
+      consoleErrorSpy.mockRestore();
     });
   });
 
@@ -773,6 +784,7 @@ describe("config store", () => {
         budget_action: "block",
         budget_warning_threshold: 0.9,
         discord_rpc_enabled: false,
+        show_thinking_blocks: true,
       };
 
       const mockInvokeImpl = vi.mocked(invoke);

src/lib/stores/config.ts

@@ -45,6 +45,8 @@ export interface HikariConfig {
   budget_warning_threshold: number;
   // Discord RPC settings
   discord_rpc_enabled: boolean;
+  // Thinking blocks settings
+  show_thinking_blocks: boolean;
 }
 
 const defaultConfig: HikariConfig = {
@@ -84,6 +86,7 @@ const defaultConfig: HikariConfig = {
   budget_action: "warn",
   budget_warning_threshold: 0.8,
   discord_rpc_enabled: true,
+  show_thinking_blocks: true,
 };
 
 function createConfigStore() {
@@ -297,6 +300,10 @@ export const shouldHidePaths = derived(
   configStore.config,
   ($config) => $config.streamer_mode && $config.streamer_hide_paths
 );
+export const showThinkingBlocks = derived(
+  configStore.config,
+  ($config) => $config.show_thinking_blocks
+);
 
 /**
  * Masks file paths in text when streamer mode with hide paths is enabled.

src/lib/stores/conversations.ts

@@ -10,6 +10,7 @@ import type { CharacterState } from "$lib/types/states";
 import { cleanupConversationTracking } from "$lib/tauri";
 import { characterState } from "$lib/stores/character";
 import { sessionsStore } from "$lib/stores/sessions";
+import { agentStore } from "$lib/stores/agents";
 
 export interface ConversationSummary {
   generatedAt: Date;
@@ -333,6 +334,10 @@ function createConversationsStore() {
       // Clean up tracking for this conversation (including temp files)
       await cleanupConversationTracking(id);
 
+      // Clean up agent tracking for this conversation
+      // This prevents the badge from persisting after tab close
+      agentStore.clearConversation(id);
+
       conversations.update((c) => {
         c.delete(id);
         return c;

src/lib/stores/todos.ts

@@ -0,0 +1,44 @@
+import { writable } from "svelte/store";
+import { listen } from "@tauri-apps/api/event";
+
+export interface TodoItem {
+  content: string;
+  status: "pending" | "in_progress" | "completed";
+  activeForm: string;
+}
+
+interface TodoUpdatePayload {
+  todos: TodoItem[];
+  conversation_id?: string;
+}
+
+// Create the writable store
+const { subscribe, set, update } = writable<TodoItem[]>([]);
+
+// Listen for todo updates from the backend
+let unlisten: (() => void) | undefined;
+
+export async function initializeTodoListener(): Promise<void> {
+  if (unlisten) {
+    return; // Already initialized
+  }
+
+  unlisten = await listen<TodoUpdatePayload>("claude:todo-update", (event) => {
+    set(event.payload.todos);
+  });
+}
+
+export function cleanupTodoListener(): void {
+  if (unlisten) {
+    unlisten();
+    unlisten = undefined;
+  }
+}
+
+// Export the store
+export const todos = {
+  subscribe,
+  set,
+  update,
+  clear: () => set([]),
+};