feat(llc): Kanban boards UI wired to the boards API (list/create/move) (#12213)

[mrveiss]

Thinking Path

Audit-first (issue premise was stale). The LLC Kanban board UI already exists and is reachable: BoardsView (list), KanbanBoardView (drag-and-drop POST /move, WIP limits), SprintBoardView, all routed under /llc/companies/:companyId/... with a nav.llcBoards sidebar entry. So the GET /boards, GET /{id}, GET /{id}/items, POST /{id}/move endpoints were already consumed.

The one genuine gap: the board create endpoints (POST /api/llc/boards/kanban, POST /api/llc/boards/sprint) had zero frontend callers — a fresh company's empty board list was a dead end (nothing ever creates a board). This wires the create path rather than duplicating the existing views.

What Changed

• New composable useKanbanBoardsApi (autobot-frontend/src/composables/llc/useKanbanBoardsApi.ts) centralising list / create-kanban / create-sprint / move against llc/api/boards.py.
• BoardsView.vue — adds a "New Kanban Board" affordance (header button + empty-state CTA) that opens a project picker (GET /api/llc/companies/{id}/projects), calls createKanbanBoard (get-or-create), and navigates to the new board. Reuses the existing BaseModal + design-token styling; no new design language, no hardcoded strings.
• i18n: added llc.boards.{newKanban,createTitle,project,selectProject,loadingProjects,noProjects,creating,create} to all 11 locales (translated de/es/fr/pt; English fallback for the rest, matching the existing partial-coverage pattern in the boards block).
• Unit test useKanbanBoardsApi.test.ts (6 tests) asserting each call hits the right endpoint + payload and parses responses.

Verification

• npx vitest run src/composables/llc/__tests__/useKanbanBoardsApi.test.ts → 6 passed.
• npx vue-tsc --noEmit -p tsconfig.app.json → no errors in touched files.
• npx eslint <touched files> → clean (exit 0).

Model Used

claude-opus-4-8

Closes #12213

[github-actions]

✅ SSOT Configuration Compliance: Passing

🎉 No hardcoded values detected that have SSOT config equivalents!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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