fix(roadmap-planner): 2026–2027 quarters + center modals on viewport

[danielfbm]

Summary

Quarters

• Default jira.quarters is now 2026Q1–2027Q4: the 2025 quarters are removed, the missing 2026Q3 is added, and all of 2027 is added.
• API.md example updated to match.
• Note: a deployed config.yaml that sets jira.quarters still overrides this default.

Modals centered on the page instead of the viewport

• Cause: .fade-in (on .kanban-container) used animation-fill-mode: both, which left transform: translateY(0) on the container after the animation ended. A transformed ancestor becomes the containing block for position: fixed descendants, so .modal-overlay covered and centered on the whole board, not the viewport.
• Fix: .fade-in now uses backwards. It looks the same and no transform is left behind. This also covers the metrics dashboard, which uses the same class.
• Safeguard: the five board modals are rendered through createPortal into document.body.

CI unblock (both gates were already red on main)

• gofmt -s on internal/contributions/bot_test.go and service.go (alignment only).
• npm audit --audit-level high: ran npm audit fix (axios, form-data, js-yaml, brace-expansion, browserslist, @babel/core), and bumped dev tooling vite 5→7, vitest 2→5 and @vitejs/plugin-react 4→5 to clear tinypool (critical) and esbuild. vite.config.js is unchanged; npm audit reports 0 vulnerabilities.

Test plan

• go build ./... and go test ./... pass (87 tests)
• Frontend: vitest run (14 passed), vite build and npm run lint pass locally; npm audit reports 0 vulnerabilities
• Manual: scroll down a long board, open the create/edit milestone and epic modals, and check that each one is centered in the viewport
• Manual: the quarter selector lists 2026Q1–2027Q4

🤖 Generated with Claude Code

https://claude.ai/code/session_013PC6xooXDx54eqGrW7zCMv