chore(frontend): introduce prettier + eslint and prune unused code

- Add Prettier 3 with prettier-plugin-organize-imports (sorts/removes unused imports)
- Add ESLint 10 flat config with typescript-eslint + eslint-plugin-vue + eslint-config-prettier
- Add root scripts: format, format:check, lint, lint:fix
- Reformat 257 files across admin-web, ops-web, desktop-client, packages
- Remove unused locals/exports flagged by --noUnusedLocals/--noUnusedParameters
- Fix duplicate localTabLabel key, surrogate-pair regex u-flag, NBSP literal in regex
- Skip server/ (Go) and apps/browser-extension/ (deprecated per ADR)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/desktop-client/src/main/app-settings.ts

@@ -1,66 +1,66 @@
-import { readFileSync, writeFileSync } from "node:fs";
-import { join } from "node:path";
+import { readFileSync, writeFileSync } from 'node:fs'
+import { join } from 'node:path'
 
-import { app } from "electron/main";
+import { app } from 'electron/main'
 
 export interface DesktopAppSettings {
-  openAtLogin: boolean;
-  keepRunningInBackground: boolean;
+  openAtLogin: boolean
+  keepRunningInBackground: boolean
 }
 
-export type DesktopAppSettingKey = keyof DesktopAppSettings;
+export type DesktopAppSettingKey = keyof DesktopAppSettings
 
 const DEFAULT_DESKTOP_APP_SETTINGS: DesktopAppSettings = {
   openAtLogin: false,
   keepRunningInBackground: true,
-};
+}
 
-let cachedSettings: DesktopAppSettings = { ...DEFAULT_DESKTOP_APP_SETTINGS };
+let cachedSettings: DesktopAppSettings = { ...DEFAULT_DESKTOP_APP_SETTINGS }
 
 function settingsPath(): string {
-  return join(app.getPath("userData"), "desktop-settings.json");
+  return join(app.getPath('userData'), 'desktop-settings.json')
 }
 
 function normalizeSettings(input: unknown): DesktopAppSettings {
-  if (!input || typeof input !== "object") {
-    return { ...DEFAULT_DESKTOP_APP_SETTINGS };
+  if (!input || typeof input !== 'object') {
+    return { ...DEFAULT_DESKTOP_APP_SETTINGS }
   }
 
-  const candidate = input as Partial<Record<DesktopAppSettingKey, unknown>>;
+  const candidate = input as Partial<Record<DesktopAppSettingKey, unknown>>
   return {
     openAtLogin:
-      typeof candidate.openAtLogin === "boolean"
+      typeof candidate.openAtLogin === 'boolean'
         ? candidate.openAtLogin
         : DEFAULT_DESKTOP_APP_SETTINGS.openAtLogin,
     keepRunningInBackground:
-      typeof candidate.keepRunningInBackground === "boolean"
+      typeof candidate.keepRunningInBackground === 'boolean'
         ? candidate.keepRunningInBackground
         : DEFAULT_DESKTOP_APP_SETTINGS.keepRunningInBackground,
-  };
+  }
 }
 
 function readPersistedSettings(): DesktopAppSettings {
   try {
-    return normalizeSettings(JSON.parse(readFileSync(settingsPath(), "utf8")));
+    return normalizeSettings(JSON.parse(readFileSync(settingsPath(), 'utf8')))
   } catch {
-    return { ...DEFAULT_DESKTOP_APP_SETTINGS };
+    return { ...DEFAULT_DESKTOP_APP_SETTINGS }
   }
 }
 
 function persistSettings(settings: DesktopAppSettings): void {
   try {
-    writeFileSync(settingsPath(), JSON.stringify(settings), "utf8");
+    writeFileSync(settingsPath(), JSON.stringify(settings), 'utf8')
   } catch (error) {
-    console.warn("[desktop-settings] persist failed", error);
+    console.warn('[desktop-settings] persist failed', error)
   }
 }
 
 function readSystemOpenAtLogin(fallback: boolean): boolean {
   try {
-    return app.getLoginItemSettings().openAtLogin;
+    return app.getLoginItemSettings().openAtLogin
   } catch (error) {
-    console.warn("[desktop-settings] read login item failed", error);
-    return fallback;
+    console.warn('[desktop-settings] read login item failed', error)
+    return fallback
   }
 }
 
@@ -69,30 +69,30 @@ function applyOpenAtLogin(openAtLogin: boolean): boolean {
     app.setLoginItemSettings({
       openAtLogin,
       openAsHidden: false,
-    });
-    return readSystemOpenAtLogin(openAtLogin);
+    })
+    return readSystemOpenAtLogin(openAtLogin)
   } catch (error) {
-    console.warn("[desktop-settings] apply login item failed", error);
-    return openAtLogin;
+    console.warn('[desktop-settings] apply login item failed', error)
+    return openAtLogin
   }
 }
 
 export function initDesktopAppSettings(): DesktopAppSettings {
-  cachedSettings = readPersistedSettings();
+  cachedSettings = readPersistedSettings()
   cachedSettings = {
     ...cachedSettings,
     openAtLogin: applyOpenAtLogin(cachedSettings.openAtLogin),
-  };
-  persistSettings(cachedSettings);
-  return getDesktopAppSettings();
+  }
+  persistSettings(cachedSettings)
+  return getDesktopAppSettings()
 }
 
 export function getDesktopAppSettings(): DesktopAppSettings {
   cachedSettings = {
     ...cachedSettings,
     openAtLogin: readSystemOpenAtLogin(cachedSettings.openAtLogin),
-  };
-  return { ...cachedSettings };
+  }
+  return { ...cachedSettings }
 }
 
 export function setDesktopAppSetting(
@@ -102,13 +102,13 @@ export function setDesktopAppSetting(
   const next: DesktopAppSettings = {
     ...cachedSettings,
     [key]: value,
-  };
-
-  if (key === "openAtLogin") {
-    next.openAtLogin = applyOpenAtLogin(value);
   }
 
-  cachedSettings = next;
-  persistSettings(cachedSettings);
-  return getDesktopAppSettings();
+  if (key === 'openAtLogin') {
+    next.openAtLogin = applyOpenAtLogin(value)
+  }
+
+  cachedSettings = next
+  persistSettings(cachedSettings)
+  return getDesktopAppSettings()
 }