Consolidate company admin screens: health badge on list, tabbed detail page

Companies/Index:
- Added Health badge column (Healthy / At Risk / Critical / Never Active)
  with the numeric score in a tooltip; computed from the same signals as
  CompanyHealth/Index using the new shared CompanyHealthHelper

Companies/Details:
- Converted flat card layout to five tabs: Overview, Users, Subscription,
  Onboarding, Health; URL hash is preserved so the active tab survives
  page refresh and back navigation
- Subscription tab shows plan/status/dates with an expiry countdown and a
  "Manage Subscription & Features" button to the full Manage page
- Onboarding tab shows wizard completion, milestone progress bar, and
  first-activity dates (previously only on the standalone page)
- Health tab shows score gauge, risk badge, and individual risk signals
  with a link through to the full CompanyHealth dashboard
- JS moved to wwwroot/js/companies-details.js (avoids inline-script failures)

Infrastructure:
- Extracted ComputeHealth / ToRiskLevel / ChurnRisk to CompanyHealthHelper.cs
  (same Controllers namespace); CompanyHealthController delegates to it
- CompanyCountSummary extended with Jobs30Counts, Jobs90Counts, LastLoginDates
  (3 extra GROUP BY queries scoped to the current page IDs, not all companies)
- CompanyListDto gains HealthScore, HealthRisk, LastLoginDate

Navigation:
- Removed "Onboarding Progress" hub card from People & Activity; the data
  is now surfaced directly on the Companies/Details Onboarding tab

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Web/Controllers/CompanyHealthHelper.cs

@@ -0,0 +1,105 @@
+using PowderCoating.Core.Entities;
+using PowderCoating.Shared.Constants;
+
+namespace PowderCoating.Web.Controllers;
+
+/// <summary>Risk bucket for a tenant company, derived from its health score.</summary>
+public enum ChurnRisk { Healthy, AtRisk, Critical, NeverActivated }
+
+/// <summary>
+/// Shared health-score logic used by both <see cref="CompanyHealthController"/> (dashboard)
+/// and <see cref="CompaniesController"/> (list + detail badges).
+/// </summary>
+public static class CompanyHealthHelper
+{
+    /// <summary>
+    /// Computes a 0–100 health score and a list of human-readable risk signals for a single
+    /// company based on its subscription status, login recency, and job activity.
+    /// See <see cref="CompanyHealthController"/> XML doc for scoring rules.
+    /// </summary>
+    public static (int Score, List<string> Signals) ComputeHealth(
+        Company c, int daysSinceLogin, int j30, int j90, int totalJobs, DateTime now)
+    {
+        var score = 100;
+        var signals = new List<string>();
+
+        if (!c.IsActive)
+        {
+            signals.Add("Account disabled");
+            return (0, signals);
+        }
+
+        if (!c.IsComped && c.SubscriptionEndDate.HasValue)
+        {
+            var daysUntil = (int)(c.SubscriptionEndDate.Value.Date - now.Date).TotalDays;
+            if (daysUntil < -AppConstants.SubscriptionConstants.GracePeriodDays)
+            {
+                score -= 50;
+                signals.Add("Subscription expired");
+            }
+            else if (daysUntil < 0)
+            {
+                score -= 30;
+                signals.Add("In grace period");
+            }
+            else if (daysUntil <= 7)
+            {
+                score -= 20;
+                signals.Add($"Expires in {daysUntil}d");
+            }
+            else if (daysUntil <= 14)
+            {
+                score -= 10;
+                signals.Add($"Expires in {daysUntil}d");
+            }
+        }
+
+        if (daysSinceLogin == -1)
+        {
+            score -= 30;
+            signals.Add("Never logged in");
+        }
+        else if (daysSinceLogin >= 90)
+        {
+            score -= 30;
+            signals.Add($"No login {daysSinceLogin}d");
+        }
+        else if (daysSinceLogin >= 60)
+        {
+            score -= 20;
+            signals.Add($"No login {daysSinceLogin}d");
+        }
+        else if (daysSinceLogin >= 30)
+        {
+            score -= 10;
+            signals.Add($"No login {daysSinceLogin}d");
+        }
+
+        if (totalJobs == 0)
+        {
+            score -= 20;
+            signals.Add("No jobs ever");
+        }
+        else if (j90 == 0)
+        {
+            score -= 10;
+            signals.Add("No jobs in 90d");
+        }
+        else if (j30 == 0)
+        {
+            score -= 5;
+            signals.Add("No jobs in 30d");
+        }
+
+        return (Math.Max(0, score), signals);
+    }
+
+    /// <summary>
+    /// Derives a <see cref="ChurnRisk"/> bucket from a pre-computed score and activity flags.
+    /// </summary>
+    public static ChurnRisk ToRiskLevel(int score, bool neverActivated) =>
+        neverActivated            ? ChurnRisk.NeverActivated
+        : score >= 75             ? ChurnRisk.Healthy
+        : score >= 45             ? ChurnRisk.AtRisk
+        :                           ChurnRisk.Critical;
+}