Upgrade all dependencies and AI models to latest versions #3986 — ccantynz/48co.v1

Originally written by @ccantynz-alt on GitHub.
Imported from https://github.com/ccantynz-alt/48co.v1/pull/51

Summary

Comprehensive technology stack upgrade across all platforms (desktop, web, extension) to use the latest stable versions of frameworks, libraries, and AI models as of March 2026.

Key Changes

Framework & Build Tool Upgrades

Next.js: 14.2 → 15.3
React: 18.3 → 19.1 (desktop, web, extension)
Vite: 5.4 → 6.2 (desktop)
Tailwind CSS: 3.4 → 4.1 with new CSS-first architecture (@import "tailwindcss" syntax)
ESLint: 8.x → 9.23
Node.js CI/CD: 20 → 22 LTS (all GitHub Actions workflows)

AI Model & API Upgrades

Claude Sonnet: claude-sonnet-4-20250514 → claude-sonnet-4-6 (updated in 4 integration points: rewrite API, translate API, grammar.rs, extension)
Anthropic API version: 2023-06-01 → 2025-09-01 (updated across 6 files: rewrite, translate, grammar routes, grammar.rs, extension content.js, extension grammar.js)
Claude Haiku: Confirmed latest version claude-haiku-4-5-20251001 in grammar endpoints

Rust Dependency Upgrades

enigo: 0.2 → 0.3 (keyboard/mouse simulation)
whisper-rs: 0.12 → 0.13 (speech-to-text)
dirs: 5 → 6 (OS directory handling)
candle: 0.8 → 0.9 (LLM inference)
uniffi: 0.28 → 0.29 (FFI bindings)

Build Configuration Updates

Tailwind CSS: Migrated from PostCSS plugin to Vite plugin (@tailwindcss/vite) in desktop app
PostCSS config: Simplified for Tailwind 4.1 (removed autoprefixer plugin configuration)
Vite config: Added Tailwind CSS Vite plugin

Documentation

Added Rule 13: "No Old Technology — Rip It Out, Put In The New" (strictest enforcement rule)
Updated Rule 5 with STRICT enforcement for technology currency
Added mandatory technology audit requirements to every session protocol
Documented March 29, 2026 audit results with all upgrades performed

Implementation Details

All API calls now use the latest Anthropic API version header
Tailwind CSS 4.1 CSS-first syntax replaces @tailwind directives
No breaking changes to application logic; upgrades are purely dependency/configuration updates
CI/CD pipelines updated to use Node.js 22 LTS across all build workflows

https://claude.ai/code/session_01BjSq8yeHeUWfsJ1Dko5uzY