Add `url` field to profile activity items so post cards link to `/posts/{slug}` and comment cards link to the parent post with a `#comment-{uid}` anchor, matching notification click behavior. Include the shared `_card_link.html` overlay in the template, fix XP bar rendering for missing `xp` key, and add API + e2e tests verifying the link structure and navigation.
Split the monolithic test directory into three tiers (unit, api, e2e) with a path-mirroring directory structure. Added corresponding Makefile targets (test-unit, test-api, test-e2e) and updated all documentation references (CLAUDE.md, README.md, testing-cicd.html, testing-framework.html, testing-make.html) to reflect the new layout and naming conventions.
