fix: restore frontend typecheck and CI dependencies

[thunderavi]

Summary

• Add the frontend/UI packages and optional provider SDKs that the checked-in TypeScript code imports, so clean CI installs can resolve them.
• Update the Calendar wrapper for the installed react-day-picker v9 formatter/custom root API.
• Update the Resizable wrapper to use react-resizable-panels named exports.
• Add a Knex test environment so GitHub Actions can run migrations with the existing DB_* env vars.

Verification

• npm ci
• npm run verify
• npm run lint:easy
• npm run typecheck
• npm run validate:production
• npm run test:coverage
• npm run test:live:adapters (skips locally without LIVE_ADAPTERS; GitHub CI runs it with Redis/Postgres/Mongo services)
• npm test -- tests/unit/migrationManager.test.js --runInBand

[Copilot]

Pull request overview

This PR restores the project's frontend TypeScript typecheck and CI installability. It adds the UI/frontend packages and optional provider SDKs that checked-in TypeScript code imports as devDependencies (so npm ci + tsc --noEmit pass cleanly), and updates two shadcn-style wrappers to match the currently-installed major versions of their underlying libraries.

Changes:

• Add ~50 devDependencies (Radix UI, Next, React 18, react-day-picker v9, react-resizable-panels v2, AWS/OpenAI/Anthropic/etc. SDKs, Tailwind helpers) and bump @types/react/add @types/react-dom.
• Update components/ui/calendar.tsx to the react-day-picker v9 formatMonthDropdown(monthNumber, locale) signature and drop the removed rootRef prop on the custom Root component.
• Update components/ui/resizable.tsx to use react-resizable-panels v2 named exports (Panel, PanelGroup, PanelResizeHandle) instead of the previous ResizablePrimitive.Group/Panel/Separator namespace usage.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
package.json	Adds frontend + optional provider SDK packages as devDependencies and bumps React type packages so CI installs/typechecks pass.
components/ui/calendar.tsx	Adapts formatMonthDropdown and the custom Root component to react-day-picker v9's API.
components/ui/resizable.tsx	Switches to react-resizable-panels v2 named exports and renames the handle to PanelResizeHandle.

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