v0.5.2 — Add ESLint + typescript-eslint, fix lint errors

Add flat-config ESLint with typescript-eslint recommended rules,
fix all lint errors (unused imports/vars, empty catches, Function types,
prefer-const, useless assignments), and rename stale kpc- CSS class to kcc-.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/main/index.ts

@@ -1,4 +1,4 @@
-import { app, BrowserWindow, Menu, clipboard, dialog, ipcMain, protocol, safeStorage, session, shell } from 'electron';
+import { app, BrowserWindow, Menu, clipboard, dialog, ipcMain, safeStorage, session, shell } from 'electron';
 import { join } from 'path';
 import { existsSync, mkdirSync, promises as fsp } from 'fs';
 import { get as httpsGet } from 'https';
@@ -14,6 +14,7 @@ import { showUpdateWindow } from './update-window';
 import { DiscordRPC } from './discord-rpc';
 
 // ── App version for API calls ──
+// eslint-disable-next-line @typescript-eslint/no-require-imports
 const appVersion: string = require('../../package.json').version;
 
 // ── Region ping cache ──
@@ -247,7 +248,7 @@ async function launchApp(): Promise<void> {
     try {
       const host = new URL(details.url).hostname;
       if (host.endsWith('krunker.io')) return callback({});
-    } catch {}
+    } catch { /* ignore invalid URLs */ }
     // Otherwise it matched an ad-block pattern — cancel it
     callback({ cancel: true });
   });
@@ -317,8 +318,6 @@ async function launchApp(): Promise<void> {
   }
 
   // ── Common output directory (used by folder actions) ──
-  const outputDir = join(app.getPath('documents'), 'Krunker Civilian Client');
-
   // ── Configurable keybinds via before-input-event ──
   win.webContents.on('before-input-event', (event, input) => {
     if (input.type !== 'keyDown') return;
@@ -333,7 +332,7 @@ async function launchApp(): Promise<void> {
       event.preventDefault();
     } else if (matchesKeybind(input, binds.joinFromClipboard)) {
       const text = clipboard.readText();
-      try { const u = new URL(text); if (u.protocol === 'https:' && u.hostname.endsWith('krunker.io')) win.loadURL(text); } catch {};
+      try { const u = new URL(text); if (u.protocol === 'https:' && u.hostname.endsWith('krunker.io')) win.loadURL(text); } catch { /* ignore invalid URLs */ }
       event.preventDefault();
     } else if (matchesKeybind(input, binds.copyGameLink)) {
       clipboard.writeText(win.webContents.getURL());