The global tasks page still deep-linked a single task with a ?task=<id>
query while the rest of the SPA moved to path-based permalinks
(/app/<name>, /admin/<…>). Bring it in line: the task is now a path
segment, /tasks/<category>/<id>.
Task ids are guaranteed `task_<digits>_<base36>` (isValidTaskId), so the
redundant `task_` prefix is dropped in the URL and restored on read via a
new window.taskPath / window.taskPartsFromPath helper pair (mirrors
appPath/appPartsFromPath). The parser still accepts the legacy ?task=
query and the full-prefixed id, so old links, bookmarks and notifications
keep resolving.
Updated every builder (tasks-manager updateURL + notification url,
task-id link, task-actions, admin config-form, setup-wizard handoff with
its &from=setup flag) and the notification navigation handler / button
text to recognise the path form.
Signed-off-by: librelad <librelad@digitalangels.vip>
9582671072