Full site redesign, help system, and dashboard stats fixes

Multi-phase visual facelift (design tokens, dashboards, sidebar/navbar
shell, per-page help guides, and a layout/content pass across every
remaining page) plus backend fixes to the dashboard KPI stats:

- Admin/Supervisor dashboard KPIs (revenue, donations, registrations,
  tickets sold) now use a rolling trailing-month window (today back one
  calendar month, e.g. 9 May - 8 June if today is 8 June) instead of
  calendar month-to-date, which under-counted for most of the month.
  The comparison window shifts the same way, so like is still compared
  with like.
- Reports deep-links from those stat tiles now match the same window
  (range=trailing_month, replacing range=this_month).
- Design tokens (brand-* Tailwind scale + shadcn CSS variables), a
  site-wide contextual help button, fixed dashboard sidebar/navbar,
  Admin/Supervisor/Staff/User dashboard rebuilds backed by a new
  GET /api/stats/overview endpoint, a dedicated Contact page, Site
  Settings restyle with WhatsApp config folded in, and an Account
  activity feed backed by a new SecurityEvent model.
- Every remaining page (home, events, registration flow, auth, legal,
  payment results, and every Admin/Supervisor/Staff/User tool page)
  restyled onto the same design tokens, several with real layout
  upgrades (home hero, events list/detail, donate page, auth pages).
- 20+ new dedicated help guides so the whole site has page-specific
  help content instead of falling back to a generic guide.
- Assorted fixes surfaced along the way: donation-leg double-counting
  in payment stats, donations not counting toward revenue, refund
  netting in per-method report breakdowns, and donation
  over-allocation after a refund.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/src/app/dashboard/user/donate/page.tsx

@@ -3,6 +3,7 @@ import React, { useEffect, useState } from "react";
 import { useAuth } from "@/hooks/useAuth";
 import { apiFetch } from "@/lib/api";
 import { useDismissingState } from "@/hooks/useDismissingState";
+import { HandHeart } from "lucide-react";
 
 export default function DonatePage() {
   const { token } = useAuth();
@@ -57,32 +58,43 @@ export default function DonatePage() {
 
   return (
     <div className="max-w-xl mx-auto w-full p-6">
-      <h1 className="text-2xl font-semibold mb-4">Make a donation</h1>
-      {error && <p className="text-red-600 text-sm mb-3">{error}</p>}
-      {info && <p className="text-green-700 text-sm mb-3">{info}</p>}
+      <div className="flex items-center gap-3 mb-6">
+        <div className="w-10 h-10 rounded-xl bg-rose-50 flex items-center justify-center shrink-0">
+          <HandHeart className="w-5 h-5 text-rose-600" />
+        </div>
+        <div>
+          <h1 className="text-2xl font-semibold text-gray-900">Make a donation</h1>
+          <p className="text-sm text-gray-500">Support an event or the ministry directly.</p>
+        </div>
+      </div>
 
-      <label className="block text-sm font-medium mb-1">Event</label>
-      <select className="w-full border rounded px-3 py-2 mb-3" value={eventId} onChange={(e)=>setEventId(e.target.value)}>
-        {events.map(ev => <option key={ev.id} value={ev.id}>{ev.title}</option>)}
-      </select>
+      <div className="border rounded-xl p-5 bg-white shadow-sm">
+        {error && <p className="text-red-600 text-sm mb-3 bg-red-50 border border-red-100 rounded-lg p-2.5">{error}</p>}
+        {info && <p className="text-green-700 text-sm mb-3 bg-green-50 border border-green-100 rounded-lg p-2.5">{info}</p>}
 
-      <label className="block text-sm font-medium mb-1">Amount (R)</label>
-      <input
-        type="number"
-        min="15"
-        step="1"
-        placeholder="Enter amount (min R15)"
-        value={amount}
-        onChange={(e)=>setAmount(e.target.value)}
-        className="w-full border rounded px-3 py-2 mb-1"
-      />
-      <p className="text-xs text-gray-600 mb-3">Minimum donation is R15.</p>
+        <label className="block text-sm font-medium text-gray-700 mb-1">Event</label>
+        <select className="w-full border rounded-lg px-3 py-2 mb-4 text-sm focus:outline-none focus:ring-2 focus:ring-brand-400" value={eventId} onChange={(e)=>setEventId(e.target.value)}>
+          {events.map(ev => <option key={ev.id} value={ev.id}>{ev.title}</option>)}
+        </select>
 
-      <button
-        disabled={loading}
-        onClick={submit}
-        className="bg-blue-600 text-white px-4 py-2 rounded disabled:opacity-60"
-      >{loading?"Starting checkout...":"Donate"}</button>
+        <label className="block text-sm font-medium text-gray-700 mb-1">Amount (R)</label>
+        <input
+          type="number"
+          min="15"
+          step="1"
+          placeholder="Enter amount (min R15)"
+          value={amount}
+          onChange={(e)=>setAmount(e.target.value)}
+          className="w-full border rounded-lg px-3 py-2 mb-1 text-sm focus:outline-none focus:ring-2 focus:ring-brand-400"
+        />
+        <p className="text-xs text-gray-500 mb-4">Minimum donation is R15.</p>
+
+        <button
+          disabled={loading}
+          onClick={submit}
+          className="w-full bg-brand-600 hover:bg-brand-700 text-white px-4 py-2.5 rounded-lg disabled:opacity-60 font-medium transition-colors"
+        >{loading?"Starting checkout...":"Donate"}</button>
+      </div>
     </div>
   );
 }