Add shared ViewHistory<V> utility class that provides a proper navigation
stack for rApps with hierarchical views. Replaces hardcoded data-back
targets with stack-based back navigation across 10 rApps: rtrips, rmaps,
rtasks, rforum, rphotos, rvote, rnotes, rinbox, rschedule, rcart.
Rename rWork module to rTasks — directory, component (folk-tasks-board),
CSS, exports, domains, and all cross-module references updated.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Update remaining references from legacy 4-value visibility model
(public/public_read/authenticated/members_only) to simplified 3-value
model (public/permissioned/private) in rInbox, rVote, identity component,
admin panel, and create-space page. Add tab trackRecent calls in shell.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>