refactor: clarify API naming, suppress interop/URL-shape rules (CA1716, CA1721, CA1724, CA1725, CA1054, CA1056, CA1003)

[DeepDiver1975]

• CA1716 (12): suppressed app-wide in .editorconfig (root section, alongside CA2007) — cross-language/VB interop rule with no value in this C#-only app; idiotic renaming any of interface members Get/Stop/Operator, params set/to, or the App.Shared namespace root.
• CA1725 (1): IncidentReportDocument.Compose param renamed document -> container to match IDocument.Compose.
• CA1721 (1): AppPaths.AppDataDir renamed to Root (property vs GetAppDataDir clash; internal to the class).
• CA1724 (1): App class in LageBuch.App.Shared suppressed — collision with LageBuch.App namespace is inherent to the app name.
• CA1003 (4): IIncidentSession.Changed and RemoteIncidentSession Disconnected/Reconnected/Ended suppressed — in-process fire-and-forget events whose Action type matches the pervasive convention (GoHomeRequested etc.).
• CA1054/CA1056 (6): string URLs suppressed with justification in IFileDialogService.OpenUrlAsync, Link.Link/Link.Url, LinkRow ctor, AboutViewModel.RepositoryUrl, and the LinksViewModelTests theory — URLs are free-form display/launch strings (persisted master data) and System.Uri would reject non-parseable values.
• Verification: all seven rules at 0 under AnalysisMode=All, zero errors, no change in any other rule vs main baseline; full suite 801 passed / 1 skipped.