feat: add "My Tasks" widget to home page

[pikann]

Summary

Adds a "My Tasks" widget to the home page that shows open tasks assigned to the current user across every project they belong to.

Backend

• New endpoint GET /users/me/tasks (task_handler.go ListAssignedToMe): resolves the caller's projects via ListAccessible, then their per-project project_members.id via ListMembers (task assignment is stored by member ID, not user ID), and queries assigned tasks across all of them.
• New TaskRepository.ListAssignedTasks / TaskService.ListAssignedTasks: returns open (non-done-category) tasks assigned to any of a set of member IDs, ordered by importance (desc) then created_at (asc), keyset-paginated with the same opaque cursor format used by ListTasks.
• page_size defaults to 10, capped at 100 (parsePageSize).
• Route registered under /users/me/tasks, guarded by deps.Task != nil; handler responds with an empty list if no project service is wired via WithTaskAssignedProjectService.
• Unit tests for the handler (member ID resolution across multiple projects, no-projects empty response, unauthenticated 401) and updated fakes/mocks in the sprint/task service and integration test suites to satisfy the extended TaskRepository/TaskService interfaces.

Frontend

• New AssignedTasksList component (assigned-tasks-list.tsx): fetches assigned tasks via an infinite query, groups them by project, and renders each group with the existing ListGroup/task-row components so it looks like a filtered slice of the project task list rather than a bespoke summary. Handles loading (skeleton), empty ("you're all caught up"), and "load more" pagination states.
• listAssignedTasks / assignedTasksQueryOptions added to interaction-api.ts, backed by useInfiniteQuery with no refetchInterval (home page isn't a live board).
• Widget wired into the home page (home/index.tsx) between the stats and projects sections, only shown when the user has at least one project; its query is prefetched in the route loader alongside the existing project/stats queries.
• Added home.myTasks.* translation strings (title, subtitle, empty state, load more/loading) to all 10 supported locales.

Testing

• Go unit tests for the new handler, repository, and service methods, plus updated fakes across sprint, task, and integration test packages to keep interfaces satisfied.
• Manual verification pending — no frontend tests added for AssignedTasksList itself.

[pullfrog]

ℹ️ No critical issues — one minor suggestion inline.

Reviewed changes — PR adds a cross-project "My Tasks" widget to the home page. A new ListAssignedToMe handler resolves the current user's per-project member IDs concurrently via errgroup, then queries open assigned tasks across all projects with importance-based keyset pagination. The frontend AssignedTasksList component groups results by project and renders them through the existing ListGroup/TaskRow infrastructure.

• New GET /users/me/tasks endpoint — TaskHandler.ListAssignedToMe authenticates, resolves per-project member IDs in parallel, and delegates to the repository's ListAssignedTasks
• Postgres ListAssignedTasks query — filters non-deleted, non-done tasks assigned to the resolved member IDs, sorted by importance descending then created_at ascending
• AssignedTasksList component — fetches via useInfiniteQuery, groups by project_id, renders each project with the shared ListGroup component and the same visible field set as the project list view
• i18n — "My Tasks" section header and empty state translated across 9 languages
• Route loader — prefetches first page via ensureInfiniteQueryData

  ^{｜ Fix all ➔ ｜ Fix 👍s ➔ ｜ View workflow run ｜ Using DeepSeek Pro (free via Pullfrog for OSS) (Kimi K2 not used — the program covers this model; add its provider key to run your pick) ｜ 𝕏}

[pullfrog]

ℹ️ No new issues in the incremental commits. One prior review thread remains open and is not addressed by these changes.

Reviewed changes — second commit adds test coverage and two defensive fixes. The frontend AssignedTasksList gets unit tests for grouping, navigation, and pagination; the endpoint gets e2e tests for cross-project aggregation and cursor pagination. The ListMembers fan-out is now capped at 20 concurrent lookups, and the service default limit is tightened from 20 to 10 to match the handler default.

• Frontend unit tests for AssignedTasksList — covers empty state, task grouping by project with navigation wiring, and "Load more" pagination exhausted
• g.SetLimit(20) on errgroup — caps concurrent per-project ListMembers lookups so a user in many projects can't fire unbounded goroutines
• Service default limit 20→10 — aligns ListAssignedTasks's fallback with the handler's parsePageSize default
• E2E tests for GET /users/me/tasks — verifies cross-project task aggregation (excludes done-status tasks and tasks assigned to others) and cursor pagination (no duplicates, no gaps)
• E2E env wiring — passes WithTaskAssignedProjectService(projectService) so the new endpoint is exercised

  ^{｜ Fix it ➔ ｜ View workflow run ｜ Using DeepSeek Pro (free via Pullfrog for OSS) (Kimi K2 not used — the program covers this model; add its provider key to run your pick) ｜ 𝕏}

[pullfrog]

✅ No new issues found.

Reviewed changes — this incremental commit adds error handling to the AssignedTasksList widget, addressing the prior review's open thread.

• Error state for failed fetches — isError from useInfiniteQuery now renders a destructive-styled banner with an AlertCircle icon and the home.myTasks.loadError string, preventing failed queries from silently showing the "all caught up" empty state
• loadError i18n key — added to all 10 supported locale files with translated error messages
• Error state test — verifies the error UI renders and the empty state / task groups do not when the fetch rejects

  ^{｜ View workflow run ｜ Using DeepSeek Pro (free via Pullfrog for OSS) (Kimi K2 not used — the program covers this model; add its provider key to run your pick) ｜ 𝕏}