Add entry screen with placeholder pages for unauthenticated users

[Copilot]

Implements an entry screen shown to unauthenticated users before login, featuring three service sections (Estate Management, Merchant Management, File Processing) with a sign-in flow that integrates with the existing OIDC authentication. Each section includes a "View More" button that navigates to dedicated placeholder pages providing detailed information about each feature area.

Changes

• EntryScreen.razor - New landing page at /entry with three feature cards. Each card has a "View More" button linking to its respective info page
• EstateInfo.razor - Unauthenticated placeholder page at /estate-info with detailed Estate Management features
• MerchantInfo.razor - Unauthenticated placeholder page at /merchant-info with detailed Merchant Management features
• FileInfo.razor - Unauthenticated placeholder page at /file-info with detailed File Processing features
• EntryLayout.razor - Minimal layout for unauthenticated views without sidebar/navigation chrome
• Home.razor - Added auth state check that redirects unauthenticated users to entry screen on mount
• Program.cs - Added /login endpoint that triggers OIDC challenge and redirects to dashboard post-auth

Flow

Unauthenticated → /entry (entry screen)
                    ↓ (click View More)
                 /[feature]-info (placeholder page)
                    ↓ (click Sign In)
                 /login (OIDC challenge)
                    ↓ (after auth)
                    / (dashboard)

Screenshots

Entry Screen:

Example Placeholder Page (Estate Management):

Merchant Management Placeholder:

File Processing Placeholder:

Original prompt

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This section details on the original issue you should resolve

<issue_title>Entry Screen</issue_title>
<issue_description>I want my app to have an entry screen as follows

This will be shown for unauthenticated users.

There will be a sign in button on the screen that will redirect to the current dashboard but must go through am oidc login flow to authenticate the user</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Entry Screen #447

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[StuartFerguson]

@copilot on the buttons View Estate, View Merchants and View Files can you change the text on all to say "View More" and add a placeholder page for each that is also unauthenticated please

[Copilot]

@copilot on the buttons View Estate, View Merchants and View Files can you change the text on all to say "View More" and add a placeholder page for each that is also unauthenticated please

Done in commit ce2ea66. All three buttons now say "View More" and link to unauthenticated placeholder pages (/estate-info, /merchant-info, /file-info). Each placeholder page includes detailed feature descriptions, Sign In button, and Back button.

Updated Entry Screen:

Example Placeholder Page: