fix: draft access publicly, invalid Petition ID and Petition Not Found Issues + Enhanced 404 page

[monzim]

This PR resolves two key issues related to petition handling and improves the overall error experience in the application. The fixes include handling invalid petition IDs and missing petitions more gracefully, as well as introducing a new error component for better user feedback.

Issue Resolved: #83 and #65

Changes:

• Saved draft petitions are accessible by public fixed

• Petition ID Validation Fixed:
  Fixed the issue where entering a string instead of a number as the petition ID would break the app. Now, invalid IDs are properly handled, and the user sees an appropriate error.

• Petition Not Found Handling:
  Improved the handling of cases where the petition ID is valid but does not exist in the database. Users now see a proper 404 error instead of a generic failure.

• New Reusable Error Component (ErrorGui):
  Added a reusable ErrorGui component that centralizes error display logic. This component is now used across the app, making it easier to maintain and standardizing the error messages.

• Refactor NotFound Component:
  Updated the NotFound component to leverage the new ErrorGui for displaying 404 errors, keeping things consistent.

• Update the PetitionActionButton

Screenshots:

• imag1.png: Shows the old broken state when a string was used as a petition ID.
• image1.png: Displays the new error component for the 404 page.

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This PR improves error handling and enhances the user experience when dealing with invalid or missing petitions.

[errhythm]

I was about to ask you to work on issue #65 as that's similar as well. Thanks a lot!

[omranjamal]

Hey @monzim could you stack on a commit or two to help me merge this?

[monzim]

Hey @monzim could you stack on a commit or two to help me merge this?

Sure