Frontend Polish

New Features

• Collapsible sidebar: Desktop sidebar collapses to a 64px icon rail. Toggle with the edge button or ⌘B / Ctrl+B. State persists across sessions. Collapsed mode shows favicon brand mark, icon-only navigation with tooltips, and compact footer controls.

• Developer Shell v2.2: Rebuilt as a document-flow panel inside the content column. When open, page content shrinks via flexbox — no overlay, no hidden buttons. Collapsed state is a slim bar with a functional prompt (type and press Enter to auto-expand). Panel height is resizable and persists across sessions.

• Docusaurus dark mode: Full dark theme for docs.speybooks.com with SpeyBooks brand colours, styled code blocks, tables, sidebar, and navbar.

Fixes

• Login dark mode logo: Login and 2FA pages now show the correct logo variant in dark mode.
• Shell sidebar overlap: The developer shell no longer renders behind or on top of the sidebar. It’s scoped entirely to the content column.

Architecture

• Layout container changed from min-h-screen to h-screen flex flex-col. Sidebar and content are flex children — no fixed positioning.
• DevShell moved from root layout level into the content column flex container.
• No database migrations, API changes, or new dependencies.