Fix sidebar scrolling when conversation list overflows screen height

[Copilot]

The sidebar was not scrollable when the conversation list exceeded the available screen height, causing conversations to be cut off and inaccessible to users.

Problem

The sidebar container used h-full but lacked proper flex layout, preventing the thread list section from taking the remaining space and scrolling independently when content overflows.

Solution

Added flex flex-col classes to the main sidebar container to enable proper space distribution:

• Header takes its natural height
• Thread list (flex-1) takes remaining available height
• overflow-y-auto can now work properly within the constrained height

Changes

• Modified src/components/sidebar/Sidebar.tsx: Added flex flex-col to sidebar container (minimal 1-line change)
• Added src/components/sidebar/Sidebar.test.tsx: Comprehensive tests to verify layout structure and scrolling behavior

Testing

• ✅ 4/4 new tests pass
• ✅ Build succeeds without errors
• ✅ No regressions in existing functionality

The fix ensures users can scroll through all conversations when the list grows beyond the sidebar height.

Fixes #11.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• workers.cloudflare.com
  • Triggering command: node /home/REDACTED/work/agents-starter/agents-starter/node_modules/.bin/vite dev (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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