feat: user invite flow, deactivate/delete, favicon, dashboard loading fix, admin full-width

- Invite flow: admin can invite users by email with role selection; accept-invite page
  sets password and creates the account; 72-hour token expiry; E2E tests
- User deactivate/reactivate/delete: new tRPC procedures + UI buttons; deactivation
  revokes all active sessions immediately; delete cascades vacation/broadcast records;
  isActive field added via migration 20260402000000_user_isactive
- Auth: block login for inactive users with audit entry
- Favicon: SVG favicon + ICO/PNG fallbacks (16, 32, 180, 192, 512px); manifest updated
- Dashboard: GridLayout dynamic-import loading skeleton prevents blank dark area
  on first login before react-grid-layout chunk is cached
- Admin users: remove max-w-5xl constraint so table uses full page width
- Dev: docker container restart workflow documented in LEARNINGS.md; Prisma generate
  must run inside the container after schema changes (named node_modules volume)

Co-Authored-By: claude-flow <ruv@ruv.net>

packages/api/src/router/user-procedure-support.ts

@@ -78,6 +78,7 @@ export async function listUsers(ctx: UserReadContext) {
       lastActiveAt: true,
       permissionOverrides: true,
       totpEnabled: true,
+      isActive: true,
     },
     orderBy: { name: "asc" },
   });
@@ -467,6 +468,120 @@ export async function getEffectiveUserPermissions(
   };
 }
 
+export async function deactivateUser(
+  ctx: UserMutationContext,
+  input: z.infer<typeof UserIdInputSchema>,
+) {
+  if (ctx.dbUser!.id === input.userId) {
+    throw new TRPCError({ code: "BAD_REQUEST", message: "You cannot deactivate your own account." });
+  }
+
+  const user = await findUniqueOrThrow(
+    ctx.db.user.findUnique({
+      where: { id: input.userId },
+      select: { id: true, name: true, email: true, isActive: true },
+    }),
+    "User",
+  );
+
+  if (!user.isActive) {
+    throw new TRPCError({ code: "BAD_REQUEST", message: "User is already inactive." });
+  }
+
+  await ctx.db.user.update({ where: { id: input.userId }, data: { isActive: false } });
+
+  // Invalidate all existing sessions so the user is logged out immediately
+  await ctx.db.activeSession.deleteMany({ where: { userId: input.userId } });
+
+  void createAuditEntry({
+    db: ctx.db,
+    entityType: "User",
+    entityId: user.id,
+    entityName: `${user.name} (${user.email})`,
+    action: "UPDATE",
+    ...withAuditUser(ctx.dbUser?.id),
+    source: "ui",
+    summary: "User deactivated",
+  });
+
+  return { success: true };
+}
+
+export async function reactivateUser(
+  ctx: UserMutationContext,
+  input: z.infer<typeof UserIdInputSchema>,
+) {
+  const user = await findUniqueOrThrow(
+    ctx.db.user.findUnique({
+      where: { id: input.userId },
+      select: { id: true, name: true, email: true, isActive: true },
+    }),
+    "User",
+  );
+
+  if (user.isActive) {
+    throw new TRPCError({ code: "BAD_REQUEST", message: "User is already active." });
+  }
+
+  await ctx.db.user.update({ where: { id: input.userId }, data: { isActive: true } });
+
+  void createAuditEntry({
+    db: ctx.db,
+    entityType: "User",
+    entityId: user.id,
+    entityName: `${user.name} (${user.email})`,
+    action: "UPDATE",
+    ...withAuditUser(ctx.dbUser?.id),
+    source: "ui",
+    summary: "User reactivated",
+  });
+
+  return { success: true };
+}
+
+export async function deleteUser(
+  ctx: UserMutationContext,
+  input: z.infer<typeof UserIdInputSchema>,
+) {
+  if (ctx.dbUser!.id === input.userId) {
+    throw new TRPCError({ code: "BAD_REQUEST", message: "You cannot delete your own account." });
+  }
+
+  const user = await findUniqueOrThrow(
+    ctx.db.user.findUnique({
+      where: { id: input.userId },
+      select: { id: true, name: true, email: true },
+    }),
+    "User",
+  );
+
+  // These tables have required (non-nullable) FKs to User — must be removed first
+  await ctx.db.vacation.deleteMany({ where: { requestedById: input.userId } });
+  await ctx.db.notificationBroadcast.deleteMany({ where: { senderId: input.userId } });
+  await ctx.db.inviteToken.deleteMany({ where: { createdById: input.userId } });
+
+  // Unlink resource (nullable FK — belt-and-suspenders)
+  await ctx.db.resource.updateMany({ where: { userId: input.userId }, data: { userId: null } });
+
+  void createAuditEntry({
+    db: ctx.db,
+    entityType: "User",
+    entityId: user.id,
+    entityName: `${user.name} (${user.email})`,
+    action: "DELETE",
+    ...withAuditUser(ctx.dbUser?.id),
+    source: "ui",
+    summary: "User account permanently deleted",
+  });
+
+  // Delete user — Prisma cascade covers: Account, Session, ActiveSession,
+  // Notification, ReportTemplate, AssistantApproval, Comment.
+  // Nullable FKs (AuditLog.userId, etc.) become NULL via Prisma SET NULL default.
+  await ctx.db.user.delete({ where: { id: input.userId } });
+
+  return { success: true };
+}
+
 export async function disableTotp(
   ctx: UserMutationContext,
   input: z.infer<typeof UserIdInputSchema>,