docs(plan): implementation plan for filter dimensions (#188)
Nine tasks, each ending in something independently testable, in an order where every task leaves both screens working. The dimensions are built and unit-tested first, the shell after them, and the two screens are wired last — so the old components stay in place until the thing replacing them is proven. The two behaviour changes the design accepted are each covered twice: a unit test on the chips that produce them, and an end-to-end assertion on what a person sees. The admin tally reading three for three statuses, and a non-default availability producing a removable chip. Task 8 carries the deletions, deliberately last. Removing `activeFilterCount` and `hasActiveFilters` turns every remaining caller into a compile error, which is the cheapest way to find them. Two defects found reviewing the plan against the code rather than against itself: the test fixture omitted `Category.item_count` and would not have compiled, and Task 9 added a page object method that nothing used — `chooseAvailability` and `filterChip` already exist. The plan also records what must not be read as a regression. Two assertions in the storefront specs fail on every branch because the unpaginated grid cannot render 1,600+ development rows inside Playwright's default timeout, which is #186 and predates this work. Refs #188
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