Make chat windows read only

lua/gemini/chat.lua

@@ -29,6 +29,7 @@ local function setup_buffer_options(bufnr)
         swapfile = false,
         bufhidden = 'wipe',
         modifiable = false,
+        readonly = true,  -- Add readonly option
     }
 
     for option, value in pairs(options) do
@@ -38,7 +39,9 @@ end
 
 local function setup_buffer_autocmds(bufnr)
     local augroup = vim.api.nvim_create_augroup('GeminiChatBuffer', { clear = true })
-    vim.api.nvim_create_autocmd({'BufReadCmd', 'FileReadCmd', 'BufWriteCmd'}, {
+    
+    -- Block all file operations
+    vim.api.nvim_create_autocmd({'BufReadCmd', 'FileReadCmd', 'BufWriteCmd', 'FileWriteCmd'}, {
         group = augroup,
         buffer = bufnr,
         callback = function()
@@ -46,25 +49,43 @@ local function setup_buffer_autocmds(bufnr)
             return true
         end
     })
+
+    -- Prevent dropping files into the buffer
+    vim.api.nvim_create_autocmd('BufEnter', {
+        group = augroup,
+        buffer = bufnr,
+        callback = function()
+            vim.opt_local.modifiable = false
+            vim.opt_local.readonly = true
+        end
+    })
 end
 
 local function setup_buffer_keymaps(bufnr)
-    local opts = { buffer = bufnr, nowait = true }
+    local opts = { buffer = bufnr, nowait = true, silent = true }
+    
+    -- Disable ALL file operations
+    local operations = {
+        'e', 'edit', 'w', 'write', 'sp', 'split', 'vs', 'vsplit',
+        'new', 'vnew', 'read', 'update', 'saveas', 'f', 'file',
+        'wq', 'wqa', 'wa', 'wall', 'q', 'quit', 'qa', 'qall'
+    }
     
-    -- Disable file operations
-    local operations = {'e', 'edit', 'w', 'write', 'sp', 'split', 'vs', 'vsplit',
-                       'new', 'vnew', 'read', 'update', 'saveas'}
     for _, op in ipairs(operations) do
         vim.keymap.set('n', ':' .. op, function()
             vim.notify('Operation not allowed in chat window', vim.log.levels.WARN)
         end, opts)
     end
 
-    -- Disable command mode
+    -- Disable command mode completely
     vim.keymap.set('n', ':', function()
         vim.notify('Command mode disabled in chat window', vim.log.levels.WARN)
     end, opts)
 
+    -- Block common file operation key combinations
+    vim.keymap.set('n', 'ZZ', '<Nop>', opts)
+    vim.keymap.set('n', 'ZQ', '<Nop>', opts)
+
     -- Set chat-specific keymaps
     local mappings = config.options.mappings
     vim.keymap.set('n', mappings.close, function()