Build multi-page dashboard shell with routed pages and active sidebar navigation

[Copilot]

The app previously rendered all workflows in a single page with no route-level navigation. This change introduces a dashboard shell with persistent sidebar navigation and route-specific content pages for dashboard, upload, processing, validation, documents, and export.

• Layout and navigation foundation

  • Converted templates/index.html into a reusable base layout (sidebar + top header + content slot).
  • Added sidebar links for all required pages with active-state highlighting based on request.path.
  • Standardized page framing so each section now renders within a consistent dashboard chrome.

• Route decomposition in Flask

  • Replaced / page rendering with redirect to /dashboard.
  • Added dedicated routes and templates for:
    • /dashboard
    • /upload
    • /processing
    • /validation
    • /documents
    • /export

• Page templates split by concern

  • Added separate templates for each page (dashboard.html, upload.html, processing.html, validation.html, documents.html, export.html) extending the base layout.
  • Kept upload/status data flow tied to existing APIs (/upload-multiple-pdfs, /file-status) while moving UI into route-specific views.

• Export surface

  • Added /export/download to stream current classification data as CSV from existing status storage.

• Docs and repo hygiene

  • Updated README with the new navigation map.
  • Added __pycache__/ to .gitignore.

@app.route('/')
def index():
    return redirect(url_for('dashboard'))

@app.route('/dashboard')
def dashboard():
    return render_template('dashboard.html')

<a class="nav-link {% if request.path == '/processing' %}active{% endif %}" href="/processing">
  Processing
</a>

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[Kr1491]

Dashboard implemented successfully

[Kr1491]

dashboard made succesfully