T16 round 2 fixes: synced charts move their shared window once per append, Fibonacci labels sit in a box clipped to the price pane and flip below near its top, and prices show every place their tick needs

src/finance/mod.rs

@@ -22,6 +22,8 @@ mod stage;
 mod steer;
 mod symbols;
 mod tape;
+#[cfg(all(test, feature = "test-support"))]
+mod tests;
 mod tools;
 mod trade;
 mod wallet;