feat(tools): add UUID/ULID generator, Chmod calc, and Crontab diff

- UuidGenerator: v1/v4/v5/v7 + ULID + NanoID with bulk output, namespace
  selector, format options (uppercase, hyphens)
- ChmodCalculator: octal/symbolic/ls-l conversion, visual bit matrix,
  setuid/setgid/sticky support, live 2-way updates
- CrontabDiff: 2 crontab comparison with timezone, next 10 runs each,
  24h overlap stats, first divergence within 7d, visual timeline

Deps: cron-parser ^5.10.0

Author: meesudzu

README.md

@@ -27,6 +27,9 @@ A sleek collection of developer tools built with React + Vite. Runs entirely in-
 | **T9 Decoder** | Decode and encode T9 phone keypad sequences (multi-tap) |
 | **Morse Code** | Translate text ↔ Morse, play the audio signal, and watch each dit/dah on a timing diagram |
 | **Subnet Calc** | Parse IPv4 CIDR and split a network into equal-sized subnets for devops/IP planning |
+| **UUID / ULID** | Generate UUID v1/v4/v5/v7, ULID, and NanoID with bulk output, format options, and copy-all |
+| **Chmod Calc** | Convert between octal, symbolic, and `ls -l` permission formats; toggle bits visually with setuid/setgid/sticky support |
+| **Crontab Diff** | Compare two cron expressions: human description, next 10 runs each, 24h stats, and first divergence within 7 days |
 
 ## Quick Start
 

package-lock.json

@@ -11,6 +11,7 @@
   "dependencies": {
     "bcryptjs": "^3.0.3",
     "clean-css": "^5.3.3",
+    "cron-parser": "^5.10.0",
     "cronstrue": "^3.11.0",
     "diff": "^7.0.0",
     "js-beautify": "^1.15.4",

package.json

@@ -12,6 +12,7 @@ import {
   Hash,
   Lock,
   CalendarClock,
+  CalendarDays,
   Hourglass,
   Mail,
   FileJson,
@@ -20,7 +21,8 @@ import {
   Table,
   FileText,
   GitCompare,
-  Network
+  Network,
+  Fingerprint
 } from 'lucide-react';
 
 import { Sidebar, Header } from './layouts';
@@ -37,7 +39,10 @@ import {
   PasswordGenerator,
   HashGenerator,
   BasicAuthGenerator,
+  ChmodCalculator,
   CrontabGenerator,
+  CrontabDiff,
+  UuidGenerator,
   SmtpChecker,
   SubnetCalculator,
   JsonToEnv,
@@ -78,6 +83,7 @@ const MENU_GROUPS = [
       { id: 'password', label: 'Password Gen', icon: Lock, keywords: ['password', 'generate', 'random', 'security', 'pass', 'strength'] },
       { id: 'hash', label: 'Hash Generator', icon: Hash, keywords: ['hash', 'md5', 'sha1', 'sha256', 'sha512', 'encode', 'digest'] },
       { id: 'basicauth', label: 'Basic Auth', icon: KeyRound, keywords: ['basic', 'auth', 'encode', 'decode', 'base64', 'header'] },
+      { id: 'chmod', label: 'Chmod Calc', icon: KeyRound, keywords: ['chmod', 'permission', 'mode', 'octal', 'symbolic', 'rwx', 'unix', 'file', 'ls'] },
     ]
   },
   {
@@ -92,6 +98,8 @@ const MENU_GROUPS = [
       { id: 'textanalyzer', label: 'Text Analyzer', icon: AlignLeft, keywords: ['text', 'analyze', 'count', 'words', 'characters', 'lines', 'length'] },
       { id: 'textdiff', label: 'Text Diff', icon: GitCompare, keywords: ['text', 'diff', 'compare', 'line', 'word', 'unified', 'side-by-side'] },
       { id: 'crontab', label: 'Crontab Gen', icon: CalendarClock, keywords: ['cron', 'crontab', 'schedule', 'time', 'generator', 'timer'] },
+      { id: 'crontab-diff', label: 'Crontab Diff', icon: CalendarDays, keywords: ['cron', 'crontab', 'compare', 'diff', 'schedule', 'next runs', 'overlap'] },
+      { id: 'uuid', label: 'UUID / ULID', icon: Fingerprint, keywords: ['uuid', 'ulid', 'nanoid', 'id', 'unique', 'random', 'generator', 'guid', 'v4', 'v7'] },
       { id: 'datatable', label: 'Data Table View', icon: Table, keywords: ['csv', 'tsv', 'table', 'data', 'preview', 'excel', 'spreadsheet'] },
       { id: 'subnet', label: 'Subnet Calc', icon: Network, keywords: ['subnet', 'cidr', 'ipv4', 'network', 'mask', 'subnetting', 'split', 'devops', 'address', 'broadcast'] },
     ]
@@ -120,7 +128,10 @@ const FEATURE_COMPONENTS = {
   password: PasswordGenerator,
   hash: HashGenerator,
   basicauth: BasicAuthGenerator,
+  chmod: ChmodCalculator,
   crontab: CrontabGenerator,
+  'crontab-diff': CrontabDiff,
+  uuid: UuidGenerator,
   smtp: SmtpChecker,
   json2env: () => <JsonToEnv initialMode="json2env" />,
   env2json: () => <JsonToEnv initialMode="env2json" />,