* fix: keep bound text and visibility in step with their variables
Text bound to a string variable was resolved only when a .fig file was read, and visibility bound to a boolean never, so editing the value or switching a mode left them showing the old one. The binding reconcile, renamed reconcileVariableBindings, now resolves text and visibility with numbers, scoped the same way, and .fig export writes them resolved in each collection's default mode. A bound font family is left as stored, since changing it needs the font loaded.
* fix: keep text and visibility an instance overrides over their bindings
Typing in a bound layer inside an instance or toggling its eye records an override but keeps the binding, so the next value edit or mode switch replaced what was typed or hidden. An overridden text or visibility now keeps its value, as an overridden width or height does.
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