Give API tokens full tile parity (icons, menu, hide-revoked); fix Groups icon bug (v0.16.21)

ROADMAP.md

@@ -166,3 +166,5 @@ Roughly in priority order:
 `v0.16.19` finishes the API Access tab's alignment with Users and Groups: the "Create token" button now lives in the shared top-right header button used by every other create action instead of its own row inside the panel, and the panel-heading text ("Programmatic access / API access tokens / Issue bearer tokens...") has been removed the same way it was for Groups in v0.16.15, since the tab button's own label already says what the section is -- the stat bar is now the first thing in the panel. Also walked the in-app Documentation view and brought it current with everything shipped since it was last substantively updated: added a full API Access section (creating a token, scope, expiry, the one-time reveal, revoking, and automatic revocation when an issuing administrator's password changes or account is disabled), corrected the Performance section's per-route table description to drop the removed per-row error-count badge and instead document the pinned column headers and the "Not configured" chip added in v0.16.16, and added an API Access entry to the documentation sidebar's contents list.
 
 `v0.16.20` audits role enforcement across the app after a run of Administration changes and fixes three places where the frontend showed a control the backend would actually reject for Standard Users and Viewers: the Dashboard's "Resync now" button (Needs Attention drift tile) and the Certificates page's "Run certificate check" button are now hidden for anyone who isn't an administrator, since both call administrator-only endpoints. The Access List editor's "Allowed groups" section -- previously always rendered with an empty `state.groups`, so a Standard User just saw a false "No groups have been created yet." -- now shows an accurate note pointing to an administrator instead, both when creating a new Access List and editing an existing one. Also corrected the in-app documentation: the Users & Groups role summary previously said Viewer "can inspect everything," which wasn't true -- Administration (System, Users, Groups, Backups, API Access, Logs & Retention, Danger Zone) is completely invisible to Viewer, the same as Standard, not merely read-only. The role summary, the Access Lists doc's Groups field, the Certificates doc's Check now section, and the Dashboard doc's Resync now section all now say plainly which actions are administrator-only.
+
+`v0.16.21` gives API Access tokens full parity with every other tile type. Tokens now get a real, persistent custom icon -- a new `icon`/`icon_slug` column pair on the `api_tokens` table (added via an idempotent `ALTER TABLE`, safe on existing installs), matching storage functions, and a `tokens` branch in the shared icon-upload/search/URL routes -- plus the same "•••" card menu every other tile has, with Change icon and Revoke token moved into it. While wiring this up, found and fixed a real pre-existing bug: Groups' own "Change icon" menu item has been broken since it shipped, because the frontend code that actually saves an icon never mapped the `groups` kind to anything and silently fell through to the Hosted Sites endpoint, which always 404'd. Also finished the rest of the API Access fix list: the Full access/Read-only counts in the summary bar now only tally active tokens, so they stay consistent with the Active/Revoked split instead of quietly including tokens that can no longer authenticate; a "Hide revoked" toggle sits at the right of that same summary bar for anyone who's revoked enough tokens over time that the tile grid gets cluttered; and the documentation now explains why a revoked token can't be deleted outright -- the record stays for the same accountability reasons the Audit log is never editable.