fix(multiline_paras): <Tab> behavior outside of fb/function

The function searches for := or => patterns anywhere in the code,
without verifying that the cursor is inside an FB/Function call context

Added is_inside_fb_call() function (lines 133-176):
- Traces backwards from cursor position
- Tracks parenthesis depth to skip nested calls
- Finds the opening ( of an FB call and checks if the name before it is a known variable
- Returns true only if cursor is inside an FB/Function call

Modified jump_to_next_param() (lines 178-189):
- Now returns false immediately if not inside an FB call context
- This causes the keymap to fall back to normal <Tab> behavior

Result:
- Inside FB call: <Tab> jumps to next := or =>
- Outside FB call: <Tab> behaves normally (inserts tab character)

lua/scl/multiline_params.lua

@@ -130,12 +130,62 @@ function M.fill_multiline_params()
   vim.api.nvim_win_set_cursor(0, { new_cursor_row, new_cursor_col })
 end
 
+local function is_inside_fb_call(bufnr, cursor_row, cursor_col)
+  local function get_line_text(rownum)
+    return vim.api.nvim_buf_get_lines(bufnr, rownum - 1, rownum, false)[1] or ""
+  end
+
+  local known_vars = get_known_variables(bufnr)
+
+  local paren_depth = 0
+  local found_fb_call_start = false
+
+  for i = cursor_row, 1, -1 do
+    local line = get_line_text(i)
+    local line_to_cursor = (i == cursor_row) and line:sub(1, cursor_col) or line
+
+    for j = #line_to_cursor, 1, -1 do
+      local char = line_to_cursor:sub(j, j)
+      if char == ")" then
+        paren_depth = paren_depth + 1
+      elseif char == "(" then
+        if paren_depth > 0 then
+          paren_depth = paren_depth - 1
+        else
+          local before_paren = line_to_cursor:sub(1, j - 1)
+          local var_match = before_paren:match("#?([%w_]+)%s*$")
+          if var_match and known_vars[var_match] then
+            return true
+          end
+          found_fb_call_start = true
+          break
+        end
+      end
+    end
+
+    if found_fb_call_start then
+      break
+    end
+
+    if line:match("^%s*END_") or line:match("^%s*BEGIN") then
+      break
+    end
+  end
+
+  return false
+end
+
 function M.jump_to_next_param()
   local cursor = vim.api.nvim_win_get_cursor(0)
   local row = cursor[1]
   local col = cursor[2]
 
   local bufnr = vim.api.nvim_get_current_buf()
+
+  if not is_inside_fb_call(bufnr, row, col) then
+    return false
+  end
+
   local total_lines = vim.api.nvim_buf_line_count(bufnr)
 
   local function get_line_text(rownum)