Implement crude new codeflow page, create mock data for it

[dkurepa]

The page currently looks like this

it's a crude look but it displays all info we want it to (except a link to the newest applicable build)
All further improvements will be made as a part of a different issue

[Copilot]

Pull request overview

Adds a new (work-in-progress) Codeflows page to the BarViz UI that renders a richer “codeflow row” view using locally-defined mock data, enabling iteration on layout/fields before wiring it to PCS.

Changes:

• Introduces a new routable Razor page (/codeflows1) that displays codeflow subscription rows with backflow/forward-flow details.
• Adds a mock-data generator (MockCodeflowData) to populate the new page.
• Extends BarViz model types to represent the new page’s row/subscription/PR shapes.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 8 comments.

File	Description
src/ProductConstructionService/ProductConstructionService.BarViz/Pages/Codeflows1.razor	New “Codeflows1” page rendering a Fluent UI data grid for codeflow rows (currently using mock data).
src/ProductConstructionService/ProductConstructionService.BarViz/Model/MockCodeflowData.cs	New helper to generate mock CodeflowPage/subscription/build/PR data for the new page.
src/ProductConstructionService/ProductConstructionService.BarViz/Model/CodeflowSubscription.cs	Adds new record types (CodeflowPage, CodeflowSubscriptionPageEntry, etc.) to support the new page model.

[Copilot]

The <Header> section is commented out with an HTML comment (<!-- ... -->), but Razor still parses @... expressions inside HTML comments. Since DefaultChannels/DefaultChannel/OnDefaultChannelSelected aren’t defined in this component, this will fail to compile. Use a Razor comment (@* ... *@) or remove the block.

[Copilot]

ActivePr.CreatedDate is modeled as DateTime (no offset/kind), but the UI computes age using DateTime.UtcNow - pr.CreatedDate. This can produce incorrect ages if the value is local/unspecified. Prefer DateTimeOffset (or at least ensure UTC kind) for timestamps coming from APIs and for time-difference calculations.

[Copilot]

CodeflowPage exposes List<...> via a singularly-named property CodeflowRow, but it actually contains multiple rows/entries. Renaming to a plural (e.g., CodeflowRows/Rows) would make the API clearer and align with the data shape.

[adamzip]

We already have something called SubscriptionDetailDialog in barviz so maybe we can give this a different name, like subscription status info, or something like that

[dkurepa]

maybe just SubscriptionInformation?

[adamzip]

Could this one have a name that also describes the units of time it represents? (eg hours, days, etc)

[dkurepa]

there is no unit. It's a number of builds behind

[adamzip]

How about countOfNewerBuilds

[dkurepa]

I think I'd prefer staleness tbh. We already have this concept in the dependency graph page, and it shows the same information and is called the same

[dkurepa]

with that said, Maybe we should use it instead. The build model has a staleness property so we can use it. Will update the PR with it