feat(nvim): add scrollable hover docs with rounded border

- Configure K to show hover docs in floating window with rounded border
- Add <C-j>/<C-k> keymaps to scroll hover documentation
- Enable lsp_doc_border in noice for consistent styling

https://claude.ai/code/session_01UcDoC4n6CWMttYFJPw17ie

.config/nvim/lua/brian/lsp.lua

@@ -45,7 +45,23 @@ vim.api.nvim_create_autocmd('LspAttach', {
     end, opts) -- jump to next diagnostic in buffer
 
     opts.desc = 'Show documentation for what is under cursor'
-    keymap.set('n', 'K', vim.lsp.buf.hover, opts) -- show documentation for what is under cursor
+    keymap.set('n', 'K', function()
+      vim.lsp.buf.hover { border = 'rounded' }
+    end, opts)
+
+    opts.desc = 'Scroll hover docs down'
+    keymap.set('n', '<C-j>', function()
+      if not require('noice.lsp').scroll(4) then
+        return '<C-j>'
+      end
+    end, { buffer = ev.buf, silent = true, expr = true })
+
+    opts.desc = 'Scroll hover docs up'
+    keymap.set('n', '<C-k>', function()
+      if not require('noice.lsp').scroll(-4) then
+        return '<C-k>'
+      end
+    end, { buffer = ev.buf, silent = true, expr = true })
 
     opts.desc = 'Restart LSP'
     keymap.set('n', '<leader>rs', ':LspRestart<CR>', opts) -- mapping to restart lsp if necessary

.config/nvim/lua/brian/plugins/noice.lua

@@ -17,7 +17,7 @@ return {
       command_palette = true, -- position the cmdline and popupmenu together
       long_message_to_split = true, -- long messages will be sent to a split
       inc_rename = false, -- enables an input dialog for inc-rename.nvim
-      lsp_doc_border = false, -- add a border to hover docs and signature help
+      lsp_doc_border = true, -- add a border to hover docs and signature help
     },
   },
   dependencies = {