…h fixes refactoring.nvim dep

debugprint focuses on the print-debugging workflow we actually used
from refactoring.nvim and ships its own keymap config, so drop the
heavier plugin in favor of it.

The notes/new prefix only exists because of obsidian, so register the
which-key group from the obsidian spec itself rather than declaring it
globally in which-key.lua.

Use wk.add for <leader>y and <leader>Y so they pick up an icon and
keep their descriptions consistent with the rest of the leader map.

Add an explicit sort order so locally-defined mappings show first, and
lowercase the News/MultiCursor group labels for visual consistency
with the other groups.

The unmap only covered normal mode, leaving the visual-mode binding
to shadow the new debugprint <leader>p prefix.

Patch safe_buf_op and the buffer previewer to swallow the debug
notify and the multi-line stack trace surfaced when an LSP can't
resolve a code action. Also wire up explicit preview/select/close
keymaps and switch the lsp keys binding from v to x mode.

…vim terminal