Add session persistence and watchlist exit button

Persists watchlist and active ticker across browser refreshes via a
localStorage bridge (components/persistence.py), and adds a sidebar
"← Watchlist" button to clear the active ticker and return to the
QuoteTable landing page.

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

1 files changed, 11 insertions, 1 deletions

diff --git a/app.py b/app.py
index e87482d..b0f3add 100644
--- a/app.py
+++ b/app.py
@@ -406,7 +406,9 @@ hr {
 
 /* Hide click receiver inputs without removing them from React's event system */
 [data-testid="stSidebar"] [data-testid="stTextInput"]:has(input[aria-label="wl_click_receiver"]),
-[data-testid="stTextInput"]:has(input[aria-label="qt_click_receiver"]) {
+[data-testid="stTextInput"]:has(input[aria-label="qt_click_receiver"]),
+[data-testid="stTextInput"]:has(input[aria-label="persist_wl"]),
+[data-testid="stTextInput"]:has(input[aria-label="persist_tk"]) {
   visibility: hidden !important;
   height: 0 !important;
   min-height: 0 !important;
@@ -590,6 +592,7 @@ _prism_template = go.layout.Template(layout=_prism_layout)
 pio.templates["prism"] = _prism_template
 pio.templates.default = "prism"
 
+from components.persistence import render_persistence_bridge
 from components.market_bar import render_market_bar
 from components.top_movers import render_top_movers
 from components.watchlist import render_watchlist
@@ -614,6 +617,7 @@ if "watchlist" not in st.session_state:
 if "active_tab" not in st.session_state:
     st.session_state["active_tab"] = "overview"
 
+render_persistence_bridge()
 
 # ── Sidebar ───────────────────────────────────────────────────────────────────
 
@@ -719,6 +723,12 @@ with st.sidebar:
 
     ticker = st.session_state["ticker"]
 
+    # ── Exit to landing page ──────────────────────────────────────────────
+    if st.session_state.get("ticker"):
+        if st.button("← Watchlist", key="exit_ticker", use_container_width=True):
+            st.session_state["ticker"] = None
+            st.rerun()
+
     # ── Workspace nav ─────────────────────────────────────────────────────
     st.markdown("<div class='psm-nav-section'>Workspace</div>", unsafe_allow_html=True)
     _nav = [