Add Google Auth, cloud sync, 690 companies data, and better UI

[anshull-saxena]

Summary

• Added Firebase Google Authentication with cloud sync for progress tracking
  via Firestore
• Integrated 690 companies with 3200+ LeetCode questions from companywise
  interview data (deduplicated)
• Redesigned UI with futuristic glassmorphism, animated grid background, neon
  glow effects, SVG progress ring, and Cmd+K command palette
• Progress persists across devices when signed in; falls back to localStorage
  when signed out

Changes

• Auth: Firebase Google Sign-In with real-time Firestore sync
  (lib/firebase.ts, components/auth-provider.tsx)
• Data: Merged 490 new companies and 1808 new questions into
  leetcode_data.json with 5 timeframe filters (30D, 3M, 6M, 1Y, All)
• UI: Animated dot grid background, gradient text, shimmer loading
  skeletons, celebration effects on completion, glassmorphism cards with glow
  borders
• Features: Command palette (⌘K), SVG circular progress ring, real-time
  sync status indicator, staggered list animations

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[Copilot]

Pull request overview

Adds a significantly expanded LeetCode-company interview prep app experience, including a questions API, client-side progress tracking, and a large set of new UI primitives to support the redesigned interface.

Changes:

• Added Next.js + Tailwind/PostCSS setup and a server API route to serve/company-filter questions from a bundled JSON dataset.
• Introduced client hooks for completion tracking and toast notifications, plus many Radix-based UI components.
• Implemented a new main page UI with company selection, filtering, stats, and a question list table.

Reviewed changes

Copilot reviewed 76 out of 640 changed files in this pull request and generated 11 comments.

Show a summary per file

File	Description
postcss.config.mjs	Adds PostCSS config for Tailwind plugin integration.
package.json	Defines Next/React app dependencies and tooling.
next.config.mjs	Configures Next.js build/typecheck and image behavior.
lib/utils.ts	Adds cn() helper for className merging.
lib/data.ts	Defines core Company/Question types.
lib/api.ts	Adds client fetch helpers for companies/questions.
legacy/preprocess.py	Updates preprocessing to emit combined companies+questions JSON.
hooks/use-toast.ts	Adds toast state management hook.
hooks/use-mobile.ts	Adds viewport breakpoint hook.
hooks/use-completion.ts	Adds localStorage-based completion tracking hook.
components/ui/use-toast.ts	Adds a second (duplicated) toast hook implementation.
components/ui/use-mobile.tsx	Adds a second (duplicated) mobile hook implementation.
components/ui/tooltip.tsx	Adds Radix tooltip wrapper component.
components/ui/toggle.tsx	Adds Radix toggle wrapper component.
components/ui/toggle-group.tsx	Adds Radix toggle-group wrapper component.
components/ui/toaster.tsx	Adds toast rendering component.
components/ui/toast.tsx	Adds Radix toast primitives + variants.
components/ui/textarea.tsx	Adds styled textarea component.
components/ui/tabs.tsx	Adds Radix tabs wrapper component.
components/ui/table.tsx	Adds table primitives/wrappers.
components/ui/switch.tsx	Adds Radix switch wrapper component.
components/ui/spinner.tsx	Adds loading spinner component.
components/ui/sonner.tsx	Adds Sonner toaster wrapper component.
components/ui/slider.tsx	Adds Radix slider wrapper component.
components/ui/skeleton.tsx	Adds skeleton loading component.
components/ui/sidebar.tsx	Adds a full sidebar system (desktop + mobile).
components/ui/sheet.tsx	Adds Radix sheet wrapper component.
components/ui/separator.tsx	Adds Radix separator wrapper component.
components/ui/select.tsx	Adds Radix select wrapper component.
components/ui/scroll-area.tsx	Adds Radix scroll-area wrapper component.
components/ui/resizable.tsx	Adds resizable panel primitives.
components/ui/radio-group.tsx	Adds Radix radio-group wrapper component.
components/ui/progress.tsx	Adds Radix progress wrapper component.
components/ui/popover.tsx	Adds Radix popover wrapper component.
components/ui/pagination.tsx	Adds pagination primitives.
components/ui/navigation-menu.tsx	Adds Radix navigation-menu wrapper component.
components/ui/menubar.tsx	Adds Radix menubar wrapper component.
components/ui/label.tsx	Adds Radix label wrapper component.
components/ui/kbd.tsx	Adds keyboard key hint components.
components/ui/item.tsx	Adds reusable “Item” layout primitives.
components/ui/input.tsx	Adds styled input component.
components/ui/input-otp.tsx	Adds OTP input components (input-otp).
components/ui/input-group.tsx	Adds input-group composite component primitives.
components/ui/hover-card.tsx	Adds Radix hover-card wrapper component.
components/ui/form.tsx	Adds react-hook-form helpers and field wrappers.
components/ui/field.tsx	Adds generic field/fieldset primitives.
components/ui/empty.tsx	Adds empty-state primitives.
components/ui/dropdown-menu.tsx	Adds Radix dropdown-menu wrapper component.
components/ui/drawer.tsx	Adds Vaul drawer wrapper component.
components/ui/dialog.tsx	Adds Radix dialog wrapper component.
components/ui/context-menu.tsx	Adds Radix context-menu wrapper component.
components/ui/command.tsx	Adds cmdk command palette primitives.
components/ui/collapsible.tsx	Adds Radix collapsible wrapper component.
components/ui/checkbox.tsx	Adds Radix checkbox wrapper component.
components/ui/chart.tsx	Adds Recharts chart container + tooltip/legend helpers.
components/ui/carousel.tsx	Adds Embla carousel primitives.
components/ui/card.tsx	Adds card primitives.
components/ui/calendar.tsx	Adds react-day-picker calendar wrapper.
components/ui/button.tsx	Adds button primitive + variants.
components/ui/button-group.tsx	Adds button-group layout primitives.
components/ui/breadcrumb.tsx	Adds breadcrumb primitives.
components/ui/badge.tsx	Adds badge primitive + variants.
components/ui/avatar.tsx	Adds Radix avatar wrapper component.
components/ui/aspect-ratio.tsx	Adds Radix aspect-ratio wrapper component.
components/ui/alert.tsx	Adds alert primitive + variants.
components/ui/alert-dialog.tsx	Adds Radix alert-dialog wrapper component.
components/ui/accordion.tsx	Adds Radix accordion wrapper component.
components/theme-provider.tsx	Adds next-themes ThemeProvider wrapper.
components/question-modal.tsx	Adds question details modal.
components/question-list.tsx	Adds questions table UI with sorting and completion toggles.
components/filter-bar.tsx	Adds UI for search + difficulty filtering.
components/company-selector.tsx	Adds company list selection UI with search.
app/page.tsx	Implements main app page UI and data loading.
app/layout.tsx	Adds global app layout + metadata + analytics.
app/globals.css	Adds Tailwind v4 theme variables and global styling.
app/api/questions/route.ts	Adds server route to filter questions from JSON data.

Comments suppressed due to low confidence (2)

components/ui/use-toast.ts:1

• Same subscription bug as hooks/use-toast.ts: the effect re-adds the listener on every state update due to [state], causing listener growth and repeated dispatch notifications. Use [] dependencies, and consider consolidating to a single toast hook implementation to prevent divergence.
  components/ui/use-mobile.tsx:1
• There are two useIsMobile implementations in the repo (hooks/use-mobile.ts and components/ui/use-mobile.tsx) with the same logic. This duplication increases maintenance risk (bugfixes applied to one copy but not the other). Prefer consolidating to a single exported hook and updating imports accordingly.

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[anshull-saxena]

made the required changes. kindly review

[FatCache]

how recent is this? can you please merge it @darkflowio @anshull-saxena