feat(profile): load Codeforces avatar and introduce reusable EmptyStateView

[mvanhorn]

Description

Two related UI improvements bundled per issue #9.

Part A. Profile screen now loads the user's actual Codeforces avatar via SDWebImageSwiftUI's WebImage instead of the SF Symbol placeholder. Protocol-relative URLs from the API (//userpic.codeforces.org/...) are normalized by prepending https:. The original person.fill symbol remains as the placeholder for nil URLs and load failures, with the same circular shape, gradient border, and neon shadow.

Part B. New reusable CForge/Views/Common/EmptyStateView.swift standardizes empty, error, and loading states across ContestListView, ProblemListView, ProfileView, and ProblemSubmissionsView. Switching off ContentUnavailableView in ProblemSubmissionsView also lifts the iOS 17+ floor for that screen.

Happy to split this into two PRs (avatar first, sweep second) if you'd prefer smaller review units. Let me know.

Related Issue

Closes #9

Changes Made

• ProfileModels.swift: add avatar: String? and titlePhoto: String? to CodeforcesUser.
• ProfileView.swift: replace the SF Symbol in profileHeader(user:) with WebImage(url: normalizeAvatarURL(user.titlePhoto ?? user.avatar)) and a person.fill placeholder. Add normalizeAvatarURL(_:) helper for protocol-relative URLs. Replace the raw red error text with EmptyStateView.
• New Views/Common/EmptyStateView.swift: configurable icon, title, optional subtitle, optional action button. Neon-themed.
• ContestListView.swift: replace bare ProgressView() initial-load placeholder with EmptyStateView (loading variant). Keeps the existing .onAppear trigger.
• ProblemListView.swift: replace the inline error VStack with EmptyStateView.
• ProblemSubmissionsView.swift: replace three ContentUnavailableView calls (signed-out, error, no-attempts) with EmptyStateView.

Screenshots (if UI changes)

Before	After

Will add before / after pairs for the Profile avatar and one or two empty states before review.

Checklist

• I have tested my changes on the iOS Simulator
• The project builds without errors (Cmd+B)
• My code follows the existing code style
• I have not committed signing/team configuration changes
• I have linked the related issue above

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 92c9b4ad-d0bd-47f0-a5c7-3b932ee8f9d7

📥 Commits

Reviewing files that changed from the base of the PR and between d744e41 and 6a9faaf.

📒 Files selected for processing (6)

• CForge/Views/Common/EmptyStateView.swift
• CForge/Views/Contest/ContestListView.swift
• CForge/Views/Problem/ProblemListView.swift
• CForge/Views/Problem/ProblemSubmissionsView.swift
• CForge/Views/Profile/ProfileModels.swift
• CForge/Views/Profile/ProfileView.swift

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[mvanhorn]

Heads up: I didn't run this on a Simulator locally. No new tests in this one (EmptyStateView is a pure-View struct), so manual QA on Profile avatar load + the four empty-state screens is on you before merge. If anything looks off in the build, ping me and I'll iterate.

[Sandesh282]

Hi @mvanhorn. Appreciate the patience here. I gave this a proper read.

Two things need to be addressed:

1. Rebase. ProfileView on main has already diverged from what this branch targets. The error state there is already better than what the diff replaces it with --it has a neonPink gradient icon and a properly styled message text, and a retry button, all of which are missing from the EmptyStateView replacement this PR proposes. A rebase should surface the conflict cleanly; ping me if you hit anything that is not straightforward to resolve.

2. ContestListView loading state. EmptyStateView was introduced in this very PR to represent empty and error states, but two files later it is being used for a loading spinner with a calendar icon and a "Loading Contests..." title. That is a direct contradiction of the component's own design intent, and it is exactly the kind of inconsistency that surfaces when code has not been walked through end-to-end before submitting. I have left a concrete fix in the inline comments.

I want to be direct about something, because I think it will save us both time. Several patterns in this PR are consistent with code that was generated rather than written, and not fully reviewed before submission. I am not saying that using AI tooling is a problem in itself, it is not, but submitting output you have not personally verified is, particularly for a multi-screen change like this one. I have a few reasons to say so:

The most obvious signal is the ContestListView issue above. You defined EmptyStateView with a clear purpose in one file and then misused it in the very next file touched by the same PR. That does not happen when a person reads their own diff.

The normalizeAvatarURL function was written as private on ProfileView:

private func normalizeAvatarURL(_ raw: String?) -> URL? {
    guard let raw = raw, !raw.isEmpty else { return nil }
    let normalized = raw.hasPrefix("//") ? "https:" + raw : raw
    return URL(string: normalized)
}

This is a pure utility function with real edge cases -- nil input, empty string, protocol-relative URLs, plain http:// URLs that would silently fail App Transport Security. Making it private to a view means none of those cases can be unit tested. A reviewer thinking about long term maintainability would not do that. It should live in Utilities/ with internal access.

The actionLabel and action parameters on EmptyStateView are individually optional and only rendered together:

if let actionLabel = actionLabel, let action = action {
    Button(action: action) { Text(actionLabel) ... }
}

If a caller passes one without the other, the button silently disappears with no error or warning. That is a footgun that a person designing a reusable component API would typically catch because they would ask "what happens if someone only passes the label?" Grouping them into a single Action struct makes the pairing explicit and impossible to misconfigure.

Finally, the branch was not rebased before opening the PR. ProfileView on main has already moved on. If you had run the project locally against the current branch, the diff would have been immediately visible.

I want to be clear that I am not trying to be harsh here. The features themselves -- the avatar loading, the EmptyStateView concept, the ContentUnavailableView removal -- are all genuinely good ideas and the right direction for the codebase. But I do need to know that the person opening the PR has read and understood every line of it, because I am the one maintaining this six months from now.

One last thing before you push the next revision -- can you tell me in a comment what normalizeAvatarURL returns when passed an empty string, and why? Just want to make sure we are on the same page before I spend time on a review pass.

[mvanhorn]

To answer your question first: normalizeAvatarURL("") returns nil. The guard rejects empty (and nil) input before any URL construction - URL(string: "") would happen to return nil anyway, but the guard makes the intent explicit: no input, no URL, and WebImage falls through to the placeholder instead of attempting a meaningless load.

Your read on verification was fair, and I will own it concretely: when I built this branch end-to-end before this revision, the avatar code did not compile against SDWebImageSwiftUI 3.x (.placeholder was applied after .clipShape, and 3.x moved placeholder into the initializer anyway). That is fixed in 7b7a0aa, and the branch now builds and tests on an iPhone 17 Pro simulator.

In 132a0fa: actionLabel/action are grouped into an EmptyStateView.Action struct so the pairing cannot be misconfigured; ContestListView loading state uses ProgressView like the rest of the app instead of EmptyStateView; normalizeAvatarURL moved to Utilities/ with internal access and 5 unit tests (nil, empty, protocol-relative, https passthrough, http preserved - the last documents that ATS, not the normalizer, decides what happens to http URLs).

On the rebase: I may be missing something - the branch is based on current main (d744e41), GitHub reports it mergeable, and the ProfileView error state on main in my checkout is a plain red Text with no retry button or neonPink icon. I also do not see inline comments on the PR; if you left a pending review it may not be submitted yet. If the improved error state lives on a branch you have not pushed, point me at it and I will rebase onto it happily.