Two merged contributions to Toolkit for YNAB: #3624 and #3630.

Toolkit Reports held all of its state in memory, so a report tab could not be linked to and the browser's back button did nothing. Synced report state to the URL behind parsing and validation utilities, making reports shareable and restoring back/forward navigation.

The follow-up fixed Firefox, which threw errors when the History API was called too rapidly: debounced the writes, split user-initiated changes from URL-triggered ones to break an update loop, wrapped the history calls in error handling, and put the whole feature behind an opt-out setting.

Impact: Made every report tab a shareable URL, then kept it working on a browser whose rate limits the first pass had not accounted for.