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/tauri.ts

@@ -14,6 +14,7 @@ import type {
 import type { CharacterState } from "$lib/types/states";
 import type { AgentStartPayload, AgentEndPayload } from "$lib/types/agents";
 import { agentStore } from "$lib/stores/agents";
+import { todos } from "$lib/stores/todos";
 import {
   initializeNotificationRules,
   cleanupNotificationRules,
@@ -182,6 +183,9 @@ export async function initializeTauriListeners() {
       // (permission prompts trigger reconnects and agents may complete before reconnect)
       if (!skipNextGreeting && targetConversationId) {
         agentStore.markAllErrored(targetConversationId);
+        // Clear the conversation's agents from the store on real disconnect
+        // This prevents agents from persisting across sessions
+        agentStore.clearConversation(targetConversationId);
       }
 
       // Only remove from connected set if we're not about to reconnect
@@ -196,6 +200,9 @@ export async function initializeTauriListeners() {
           "system",
           "Disconnected from Claude Code"
         );
+
+        // Clear todos on real disconnect (not on reconnects for permissions)
+        todos.clear();
       }
 
       // Update character state for this conversation
@@ -272,7 +279,7 @@ export async function initializeTauriListeners() {
     if (conversation_id) {
       claudeStore.addLineToConversation(
         conversation_id,
-        line_type as "user" | "assistant" | "system" | "tool" | "error",
+        line_type as "user" | "assistant" | "system" | "tool" | "error" | "thinking",
         content,
         tool_name || undefined,
         costData,
@@ -281,7 +288,7 @@ export async function initializeTauriListeners() {
     } else {
       // Fallback to active conversation if no conversation_id provided
       claudeStore.addLine(
-        line_type as "user" | "assistant" | "system" | "tool" | "error",
+        line_type as "user" | "assistant" | "system" | "tool" | "error" | "thinking",
         content,
         tool_name || undefined,
         costData,
@@ -448,10 +455,6 @@ export async function initializeDiscordRpc() {
       const startedAtUnixSeconds = Math.floor(startedAt.getTime() / 1000);
       const model = config.model || "claude";
 
-      await invoke("log_discord_rpc", {
-        message: `[FRONTEND] Attempting to initialize Discord RPC: session='Idle', model='${model}', timestamp=${startedAtUnixSeconds}`,
-      });
-
       console.log("Initializing Discord RPC with initial activity:", {
         session_name: "Idle",
         model,
@@ -464,23 +467,13 @@ export async function initializeDiscordRpc() {
         startedAt: startedAtUnixSeconds,
       });
 
-      await invoke("log_discord_rpc", {
-        message: "[FRONTEND] Discord RPC initialized successfully!",
-      });
-
       console.log("Discord RPC initialized successfully with initial presence");
     } catch (error) {
-      const errorMessage = error instanceof Error ? error.message : String(error);
-      await invoke("log_discord_rpc", {
-        message: `[FRONTEND] ERROR: Failed to initialize Discord RPC: ${errorMessage}`,
-      });
       console.error("Failed to initialize Discord RPC:", error);
       console.warn("Discord RPC will be unavailable. Make sure Discord is running.");
     }
   } else {
-    await invoke("log_discord_rpc", {
-      message: "[FRONTEND] Discord RPC is disabled in config, skipping initialization",
-    });
+    console.log("Discord RPC is disabled in config, skipping initialization");
   }
 }