Extend parseLocation() to read ?entry= and initialise
selectedEntryUid from it on mount.
When entries load (or reload), a new effect checks whether
selectedEntryUid is set without a corresponding selectedEntry
object and restores it by finding the matching entry in the list.
This covers page refresh, URL sharing, and back/forward navigation.
The URL params sync effect now includes selectedEntryUid alongside
q and tag, and the popstate handler restores all three.
Also includes rebuilt frontend static assets.
