Fix persistence write-before-read and click swallow bugs

Two root causes:

1. The JS wrote empty session defaults to localStorage before reading
   stored values back, destroying saved data on every fresh page load.
   Fixed by gating on data-loaded: JS reads+restores only when loaded=0,
   writes+saves only when loaded=1.

2. st.rerun() inside render_persistence_bridge() aborted the render
   before qt_click_receiver/wl_click_receiver were registered. Streamlit
   clears unrendered widget state, so pending click values (_qt_click,
   _wl_click) were wiped before quotetable/watchlist could process them.
   Fixed by removing st.rerun() — the bridge runs at the top of the
   render cycle so restored session state propagates to components below
   in the same pass; no extra rerun needed.

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

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