* fix(canvas): replace native title tooltip with styled overflow tooltip on block params
Hovering a truncated subblock value or block name on the canvas popped
the browser's raw native tooltip with the full untruncated content
(including raw code). Replace the `title` attribute with the
cursor-following styled Tooltip, shown only when the text is actually
clipped.
* fix(canvas): drop unused ResizeObserver in OverflowSpan
useFloatingTooltip's canShow already receives the hovered element, so
measuring overflow via useIsOverflowing was redundant — every canvas
row was paying for a ResizeObserver and resize listener it never used.
Waleed
9ee499e9f7