fix: reset in_assignment after multiline assignment ends

- Fix formatter to properly detect when multiline assignment ends
- Add check for line ending with := and ; before checking continuation
- Fixes issue where subsequent lines were incorrectly indented

src/formatter.lua

@@ -329,9 +329,13 @@ function M.format_document(content, options)
 
     trimmed = collapse_attribute_block(trimmed)
 
+    -- Check if this line ends an assignment (has := and ends with ;)
+    local ends_assignment = trimmed:match(":=") and trimmed:match(";%s*$")
+
     -- Check if continuing assignment
     -- Continuation if: in assignment AND (starts with operator OR doesn't start new statement)
-    if in_assignment then
+    -- BUT NOT if this line ends an assignment
+    if in_assignment and not ends_assignment then
       local starts_with_operator = is_assignment_continuation(trimmed)
       local is_new_statement = trimmed:match("^%w+") and (
         trimmed:match(":=") or 
@@ -518,7 +522,9 @@ function M.format_document(content, options)
         local var_trimmed = var_part:match("^(.-)%s*$")
         assignment_continuation_indent = base_indent .. string.rep(" ", #var_trimmed + 4)
         
-        if not trimmed:match(";%s*$") then
+        if trimmed:match(";%s*$") then
+          in_assignment = false
+        else
           in_assignment = true
         end
       end