fix(ui): fix screen jitter!

Just setting the cursor is enough to scroll the window. There's no need
to do anything else.

Adding the `zb` just adds jitter occasionally

Author: cameronr

lua/opencode/ui/ui.lua

@@ -12,12 +12,6 @@ function M.scroll_to_bottom()
   local line_count = vim.api.nvim_buf_line_count(state.windows.output_buf)
   vim.api.nvim_win_set_cursor(state.windows.output_win, { line_count, 0 })
 
-  vim.schedule(function()
-    vim.api.nvim_win_call(state.windows.output_win, function()
-      vim.cmd('normal! zb')
-    end)
-  end)
-
   -- TODO: shouldn't have hardcoded calls to render_markdown,
   -- should support user callbacks
   vim.defer_fn(function()