Create Confirmation Page after Shift Signup

[carboninl]

Overview

Create a confirmation page that users see after successfully signing up for a shift. This should display key details about their signup, confirming their participation and providing shift-specific information.

This feature is paired with issue #42, as it depends on the ability to display registered shifts.

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Confirmation Page Requirements

• Show a clear thank you/confirmation message.
• Display the event and shift details the user signed up for (location, time, shift names, etc.).
• Provide a summary or visual feedback, styled as in the attached design.
• Include navigation options—at minimum, a way to confirm and to go back.
• Should match Operation Surf branding and UI style.

Reference Design

Dependencies

• Blocked by Create Event Details Page with Shifts and Contact Info #42 (requires access to user's shift selections per event).

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Acceptance Criteria:

• Confirmation page appears after a successful shift signup.
• Displays accurate, relevant shift/event information.
• Matches provided UX mockup and branding.
• Linked with backend event/shift data.
• Navigation buttons work as intended.

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Related: #42