feat(webpage): add AI landing page generation with preview

[ram-from-tvl]

Description
This update introduces an end-to-end webpage generation feature that creates a polished, AI-generated landing page from parsed paper content. The output is focused on clear paper highlights, figure visibility, and repository/resource links, with adaptive structure based on paper content.

Demo video

saral-webpage-demo-1_ym2wvnQd.mp4

Key improvements:

1. Added backend webpage generation and preview/download endpoints.
2. Implemented AI-driven prompt flow with quality checks for layout and figure usage.
3. Enforced single-page generation per run for a cleaner workflow.
4. Simplified frontend to a single live preview experience.
5. Removed sidebar variant clutter and kept a prominent Download HTML action.
6. Updated download naming to neutral, production-friendly filenames.

[Copilot]

Pull request overview

Adds an end-to-end “AI landing page” feature that generates a single polished HTML research webpage per run, exposes it via backend endpoints (generate/list/preview/download/assets), and provides a simplified frontend UI with live preview + HTML download.

Changes:

• Backend: added webpage generation service (Gemini prompt + validation/repair), plus API routes for generate/list/preview/download and figure asset serving.
• Frontend: added a new “Webpage Generation” page with viewport preview controls and a Download HTML action, plus API client methods.
• App wiring: added route and sidebar entry for the new page and created a temp directory for webpage outputs.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
frontend/src/services/api.js	Adds WebpageService + ApiService helpers for generate/list/preview/download.
frontend/src/pages/WebpageGeneration.jsx	New UI for generate, live preview iframe, and HTML download.
frontend/src/components/navigation/Sidebar.jsx	Adds sidebar nav item for the new feature.
frontend/src/App.jsx	Registers /webpage-generation route behind ProtectedRoute.
backend/app/services/webpage_generator.py	Implements Gemini prompting, validation/repair, and variant persistence.
backend/app/routes/webpage.py	Adds generate/list/preview/download/asset endpoints.
backend/app/models/request_models.py	Adds request/response models for webpage generation and variants.
backend/app/main.py	Includes the new router and creates temp/webpages dir at startup.

Comments suppressed due to low confidence (1)

frontend/src/components/navigation/Sidebar.jsx:78

• Webpage Generation is added with step: 0 and handleLinkClick calls setStep(0). After this, other navigation items become inaccessible because isAccessible requires step <= currentStep (and currentStep is now 0), effectively locking the user out of the main workflow unless steps were already completed. Consider decoupling this page from the step-gated workflow (e.g., omit step/setStep for this item, or assign it a step number that doesn’t break gating and adjust isAccessible accordingly).

  const navigationItems = [
    { to: '/api-setup', icon: FiKey, label: 'API Setup', step: 1 },
    { to: '/paper-processing', icon: FiUpload, label: 'Paper Upload', step: 2 },
    { to: '/script-generation', icon: FiEdit3, label: 'Script Generation', step: 3 },
    { to: '/slide-creation', icon: FiSliders, label: 'Slide Creation', step: 4 },
    { to: '/media-generation', icon: FiPlay, label: 'Media Generation', step: 5 },
    { to: '/poster', icon: FiZap, label: 'Poster Generation', step: 6 },
    { to: '/results', icon: FiDownload, label: 'Results', step: 7 },
    { to: '/webpage-generation', icon: FiGlobe, label: 'Webpage Generation', step: 0 },
  ];

  const handleLinkClick = (step) => {
    if (step === 0 || step <= currentStep || completedSteps.includes(step)) {
      setStep(step);
      disableAutoProgress();
    }

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[ram-from-tvl]

Hi @RahulSundar
checking in to see if there is any feedback on this PR. Happy to address any requested updates to help get this merged.
Thanks!