Introduce getServerSession, add DB indexes, pagination and UI refinements

[aliamerj]

Motivation

• Centralize server-side session retrieval into a cached helper to avoid repeating auth.api.getSession and headers() across pages.
• Improve query performance for feature and changelog screens by adding indexes and a migration.
• Add pagination, loading states, and client-side navigation/UX polishing to multiple lists and dashboards.

Description

• Added a cached helper getServerSession in lib/server/session.ts and replaced direct auth.api.getSession({ headers: await headers() }) calls across many server components with getServerSession() and concurrent Promise.all patterns.
• Introduced DB indexes and a drizzle migration: added index definitions to db/schema.ts, created drizzle/0033_quick_perf_indexes.sql, and updated drizzle/meta/_journal.json.
• Implemented pagination and counts for feature lists (public and project views) including server-side limit/offset and total-count queries, and updated FeatureList to support pagination controls.
• Added loading skeletons: app/(dashboard)/projects/loading.tsx and app/(dashboard)/projects/[id]/loading.tsx.
• Replaced several client-side animations and motion usages with simpler markup (removed motion/react-client in multiple components) and improved sidebar/navigation by switching to next/link and active-path detection in nav-main.tsx and nav-secondary.tsx.
• Wrapped heavy analytics components with dynamic imports and Suspense fallbacks in app/(dashboard)/projects/[id]/page.tsx to improve load behaviour.
• Fixed widget preview parsing and script loading by using next/script with safe JSON parse and explicit load strategies.
• Minor bug fixes and UI tweaks such as correcting the support URL in app-sidebar.tsx and adding tag/status grouping in public roadmap rendering.

Testing

• Ran a production build with next build successfully.
• Ran type checks and linter via pnpm -w lint/pnpm -w typecheck and they passed.
• Ran the test suite with pnpm test and unit/integration tests completed successfully.

---

Codex Task