Improve admin UI visual design — polish look and feel (#59)

* Improve admin UI visual design — polish look and feel

- Sticky nav bar with subtle shadow, branded GroomBook wordmark, green gradient Book button
- Consistent brand green (#4f8a6f) for primary buttons across all admin pages
- Tables wrapped in white cards with rounded corners and soft shadows
- Uppercase table headers with better spacing and hierarchy
- Input/button border-radius increased to 6px for softer feel
- Global CSS: button transitions, input focus states with brand green ring, subtle card shadows
- Background changed from plain white to light gray (#f0f2f5) for depth
- Reports: polished stat cards with shadows, refined section headers, card-wrapped tables
- Custom scrollbar styling for a cleaner look

Closes groombook/groombook#58

Co-Authored-By: Paperclip <noreply@paperclip.ing>

* Fix test selectors for branded nav text

- Use regex /Groom\s*Book/ to match split-element brand text
- Use getByRole("link") for Book CTA to avoid matching brand <strong>

Co-Authored-By: Paperclip <noreply@paperclip.ing>

* Fix brand text test to handle split-element rendering

The nav brand was changed to <span>Groom</span>Book for color styling,
but getByText with a regex can't match text split across child elements.
Use a custom text matcher that checks the STRONG element's textContent.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

* Fix E2E tests for split-element brand name

The brand is now <span>Groom</span>Book (no space), so Playwright's
getByText needs "GroomBook" instead of "Groom Book".

Co-Authored-By: Paperclip <noreply@paperclip.ing>

---------

Co-authored-by: Groom Book CTO <cto@groombook.dev>
Co-authored-by: Paperclip <noreply@paperclip.ing>
Co-authored-by: Groom Book CTO <cto@groombook.app>

apps/web/src/pages/Services.tsx

@@ -119,7 +119,7 @@ export function ServicesPage() {
         <h1 style={{ margin: 0 }}>Services</h1>
         <button
           onClick={openNew}
-          style={{ ...btnStyle, backgroundColor: "#3b82f6", color: "#fff", borderColor: "#3b82f6", marginLeft: "auto" }}
+          style={{ ...btnStyle, backgroundColor: "#4f8a6f", color: "#fff", borderColor: "#4f8a6f", marginLeft: "auto" }}
         >
           + Add Service
         </button>
@@ -128,11 +128,12 @@ export function ServicesPage() {
       {services.length === 0 ? (
         <p>No services configured yet.</p>
       ) : (
+        <div style={{ background: "#fff", borderRadius: 8, border: "1px solid #e5e7eb", overflow: "hidden", boxShadow: "0 1px 3px rgba(0, 0, 0, 0.04)" }}>
         <table style={{ width: "100%", borderCollapse: "collapse", fontSize: 14 }}>
           <thead>
             <tr style={{ background: "#f8fafc" }}>
               {["Name", "Description", "Price", "Duration", "Status", ""].map((h) => (
-                <th key={h} style={{ textAlign: "left", padding: "0.5rem 0.75rem", borderBottom: "1px solid #e2e8f0" }}>
+                <th key={h} style={{ textAlign: "left", padding: "0.55rem 0.75rem", borderBottom: "1px solid #e5e7eb", fontSize: 11, fontWeight: 600, color: "#6b7280", textTransform: "uppercase", letterSpacing: "0.04em" }}>
                   {h}
                 </th>
               ))}
@@ -171,6 +172,7 @@ export function ServicesPage() {
             ))}
           </tbody>
         </table>
+        </div>
       )}
 
       {showForm && (
@@ -230,7 +232,7 @@ export function ServicesPage() {
               <button
                 type="submit"
                 disabled={saving}
-                style={{ ...btnStyle, backgroundColor: "#3b82f6", color: "#fff", borderColor: "#3b82f6" }}
+                style={{ ...btnStyle, backgroundColor: "#4f8a6f", color: "#fff", borderColor: "#4f8a6f" }}
               >
                 {saving ? "Saving…" : editing ? "Save Changes" : "Create Service"}
               </button>
@@ -277,15 +279,15 @@ function Field({ label, children }: { label: string; children: React.ReactNode }
 }
 
 const btnStyle: React.CSSProperties = {
-  padding: "0.35rem 0.75rem", border: "1px solid #d1d5db",
-  borderRadius: 4, background: "#f9fafb", cursor: "pointer", fontSize: 13,
+  padding: "0.4rem 0.85rem", border: "1px solid #d1d5db",
+  borderRadius: 6, background: "#fff", cursor: "pointer", fontSize: 13, fontWeight: 500,
 };
 
 const inputStyle: React.CSSProperties = {
-  width: "100%", padding: "0.4rem 0.5rem", border: "1px solid #d1d5db",
-  borderRadius: 4, fontSize: 14, boxSizing: "border-box",
+  width: "100%", padding: "0.45rem 0.6rem", border: "1px solid #d1d5db",
+  borderRadius: 6, fontSize: 14, boxSizing: "border-box",
 };
 
 const tdStyle: React.CSSProperties = {
-  padding: "0.5rem 0.75rem", borderBottom: "1px solid #e2e8f0",
+  padding: "0.55rem 0.75rem", borderBottom: "1px solid #f3f4f6",
 };