Drop opencode and supermaven, fix prettier, move path-copy keymaps

- Remove the opencode.nvim and supermaven-nvim plugin specs.
- formatting.lua: stop hardcoding prettier's path. It pointed at
  mise/installs/node/22.20.0, which no longer exists (now 24.19.0), so
  conform silently failed to format. Dropping `command` lets conform
  inherit its built-in definition and resolve prettier on PATH, which
  mason.nvim populates.
- keymaps.lua: move the file-path copy maps from <leader>cy/cY to
  <leader>yp/yP.
- Pick up Omarchy Quattro's remote_clipboard.lua and the news-alert
  suppression, plus the lazy-lock/lazyvim.json churn from the upgrade.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

lua/plugins/formatting.lua

@@ -4,7 +4,19 @@ return {
     opts = {
       formatters = {
         prettier = {
-          command = "/home/pastilhas/.local/share/mise/installs/node/22.20.0/bin/prettier",
+          -- No `command` here on purpose. conform inherits it from its built-in
+          -- prettier definition, which resolves the name on PATH — and mason.nvim
+          -- puts ~/.local/share/nvim/mason/bin on Neovim's PATH, so the copy
+          -- listed in `ensure_installed` below is found automatically.
+          --
+          -- This used to hardcode a mise node path
+          -- (.../mise/installs/node/22.20.0/bin/prettier). That node version has
+          -- since been replaced by 24.19.0, so the path no longer existed and
+          -- prettier formatting was silently doing nothing.
+          --
+          -- `args` is set rather than appended, so it replaces conform's default
+          -- argument list. --no-config keeps formatting consistent regardless of
+          -- any .prettierrc in the project.
           args = { "--no-config", "--stdin-filepath", "$FILENAME" },
         },
       },