- Landing: replaced custom landing-nav with standard top-header
- Removed scroll listener for nav (no longer needed)
- Header CSS moved to shared.css (single source)
- Removed duplicate header CSS from login, register, status
- All 4 public pages now have identical header with theme toggle
- Sidebar: smaller icons (36px), reduced gaps, overflow scroll for nav area
- Dashboard header: fixed top bar with logo, nav links, user name, logout
- Expanded hero description with tool overview text
- Sidebar fits on all screen heights without overflow
- Extract shared CSS (sidebar, theme vars, layout) into shared.css
- Extract shared JS (tailwind config, sidebar injection, theme toggle) into shared.js
- Remove ~1200 lines of duplicated code across 13 HTML pages
- Standardize all titles to format: Tool Name — WA Dev Tools
- Standardize page headers (h1 + description) across all tools
- Standardize container padding (tool-container class)
- Sidebar now injected via JS — single source of truth
- Use CSS variables for accent colors everywhere (no more hardcoded #0054e6)
