feat: Tasks and Projects module (time tracking, Kanban, invoicing from tasks)

[gdarko]

Summary

The complete first version of the official Tasks and Projects module, consolidated from the stacked drafts #1 to #13 into three reviewable commits. The tree is identical to the top of that stack (feat/timer-dialogs).

1. Data model, services and HTTP API. Projects, tasks, time entries and task statuses scoped to the company. The timer service starts, stops with configurable rounding, discards, keeps one running entry per user and treats a start on the already running task as idempotent. Tasks lock once invoiced. Billing preparation turns selected tasks or a whole project into host invoice lines. Settings come back in their declared types, abilities are registered through the SDK, and the module adds Tasks and Projects to the sidebar.
2. Screens. Task-centric UI in the shape of Invoice Ninja v5: a Tasks screen with list, board and week views, a task page with its time log, project pages, a start dialog with project and task pickers and inline task creation, a save-and-stop dialog with description and billable, the header timer chip and floating launcher, reports, and invoicing from a task, a selection, a project or the unbilled-time page that lands on the host invoice editor. The built bundle is included.
3. Docs. README and agent guidance.

Depends on

• SDK feat: registerPage types, ability registry, member and invoice readers (module_api 1.3.0) modules#8 (registerPage types, ability registry, member and invoice readers), to be tagged 3.4.0.
• Host feat(modules): adopt SDK 3.4 (module_api 1.3.0) and host data reader additions InvoiceShelf#768, #769 and #770 (SDK 3.4 adoption, contracted page routes, module abilities).

Until those merge, composer.json pins the SDK development branch; the pin moves to ^3.4 afterwards.

Verification

• Module test suite: 328 tests passing, plus the SDK module.json and migration validators.
• Frontend: lint, typecheck and build clean, one Vue instance shared with the host.
• Browser pass on the local stack as the demo user: timers from every control, the stop and start dialogs, task list, board and week views, time log edits, and invoices created from a task, a selection, a project and the unbilled-time page.

Supersedes #1, #2, #3, #4, #5, #6, #7, #8, #9, #10, #11, #12 and #13.

https://claude.ai/code/session_01DCf36XDKprZifej8dc2r1E