This is very close to being release-able. Only a few remaining CSS quirks to fix. Opening this to keep track of them

• Make sidebar items (with children) collapsible on clicking whole name
• Make sidebar items remember open / closed state based on localStorage
• Make clicking on X remove from query
• Fixing wrapping of long subject titles in search
• Make tags in search result fully right align
• Add tooltip for sender values in search results
• Make tags in search results clickable to remove from query
• Add some rough documentation for search queries to Help page
• Fix login / auth page to support logo and colors
• Remove the "Send your encryption key" in missing key view
• Make sidebar tags hide if already in search query
• Fix sidebar overlap responsive issue

There are a handful of bugs in the CSS of this right now that need to be fixed before we release it. I'm just opening this issues to keep track as i'm working between two machines

• Add icons to info menu
• Remove search result "drag" grip
• Darken search tool text + icon + on state colors
• Hide remove
• Move tags and count (on search view) above tools
• Remove horizontal scrollbar on sidebar
• Fix right-side scrollbar doubling
• Fix scroll overflow / chopping
• Message view with long titles is funky
• Add background to normal pages divs