Fix submit verification: wait for modal detach instead of fixed sleep

Replace fixed 2.5s sleep + single check with event-driven waitForSelector
(state: 'detached', timeout: 8s). If modal persists, check for success
indicators (success text, Submit button gone) before marking incomplete.
Fixes false 'incomplete' status when LinkedIn shows post-submit dialog.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -16,3 +16,9 @@ config/search_config.json
 
 # Templates are committed instead (see config/*.example.json)
 data/*.lock
+test_dry_run.mjs
+test_full_flow.mjs
+test_modal_diag.mjs
+test_labels.mjs
+test_buttons.mjs
+test_submit.mjs