Fix multiline params feature and auto-prefix

- Fix FB/function call parameter detection to prevent incorrect # prefixing
- Preserve # prefix when filling multiline params
- Add comma after first parameter and closing bracket on last param line
- Fix Tab navigation to position cursor after :=/=> operators
- Clean up dead code in multiline_params.lua
- Add setup functions for multiline params feature in both scl and scl_lsp

lua/scl/auto_prefix.lua

@@ -118,6 +118,36 @@ local function is_in_var_section()
   return in_var
 end
 
+-- Check if we're inside an FB/Function call parameter list
+local function is_in_fb_call_params()
+  local cursor_col = vim.api.nvim_win_get_cursor(0)[2]
+  local line = vim.api.nvim_get_current_line()
+
+  -- If line ends with ");" or similar, we're at end of params
+  if line:match("%s*%);?%s*$") then
+    return false
+  end
+
+  -- Count parens before cursor position
+  local open_count = 0
+  local close_count = 0
+  for i = 1, cursor_col do
+    local c = line:sub(i, i)
+    if c == "(" then
+      open_count = open_count + 1
+    elseif c == ")" then
+      close_count = close_count + 1
+    end
+  end
+
+  -- If there are unclosed parens before cursor, we're inside params
+  if open_count > close_count then
+    return true
+  end
+
+  return false
+end
+
 -- Check if we're after BEGIN keyword
 local function is_after_begin()
   local bufnr = vim.api.nvim_get_current_buf()
@@ -301,6 +331,11 @@ local function auto_prefix_current_line()
     return
   end
 
+  -- Don't prefix if inside FB/Function call parameters
+  if is_in_fb_call_params() then
+    return
+  end
+
   -- Only prefix after BEGIN
   if not is_after_begin() then
     return
@@ -335,6 +370,11 @@ local function on_dot_typed()
     return
   end
 
+  -- Don't prefix if inside FB/Function call parameters
+  if is_in_fb_call_params() then
+    return
+  end
+
   -- Only prefix after BEGIN
   if not is_after_begin() then
     return