feat(CopilotChat): Improve line separation and prompt update logic, add diff view#99

jellydn merged 4 commits intoCopilotC-Nvim:canaryCopilotC-Nvim/CopilotChat.nvim:canaryfrom

deathbeam:better-submitdeathbeam/CopilotChat.nvim:better-submitCopy head branch name to clipboard