House rules: numbers through one formatter, no made-up server errors, and the rules fail the build

- Every number shown on a page goes through NumbersExtensions: counts,
  percentages, the nerd readouts and the values written into a style.
- A failure the client builds itself (offline, timeout, retries run out, an
  answer it can't read) is a 400 that names its kind; only a server's own 5XX
  passes through.
- Login, sign-up, recovery and password confirmations leave autocomplete to
  the browser, so it can offer the saved login.
- The Daisy components start with empty lists and attributes, and a
  decorative image still renders alt="".
- Arasaka.HouseRules.Analyzers checks all of this in every build, together
  with PrivaPub.ClientModels.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01W4YtEJrgxG12Pc39Fai8Bd

Components/Admin/BackupsPanel.razor

@@ -148,7 +148,7 @@
 		@if (ticket is null)
 		{
 			<p class="text-sm">@Localizer["It holds every persona's private keys and private posts: keep it where only you can read it. Your password, to get a link:"]</p>
-			<DInput TValue="string" type="password" @bind-Value="password" Immediate="true" autocomplete="current-password" maxlength="200"
+			<DInput TValue="string" type="password" @bind-Value="password" Immediate="true" maxlength="200"
 					placeholder="@Localizer["Password"]" data-backup-password />
 			<ErrorViewer AdditionalError="@dialogError" />
 		}
@@ -182,7 +182,7 @@
 			{
 				<p>@Localizer["{0} logins were deleted since; a restore deletes them again.", restoring.RootsDeletedSince]</p>
 			}
-			<DInput TValue="string" type="password" @bind-Value="password" Immediate="true" autocomplete="current-password" maxlength="200"
+			<DInput TValue="string" type="password" @bind-Value="password" Immediate="true" maxlength="200"
 					placeholder="@Localizer["Password"]" data-backup-password />
 			<DInput TValue="string" @bind-Value="typedHost" Immediate="true" autocomplete="off" maxlength="253"
 					placeholder="@Localizer["Type {0} to confirm", backups.Host ?? ""]" data-backup-host />