Add a real background image to the ending screen

Same treatment as the intro: generated desk photo (empty chair, a
single closed box where the stamp used to be, one dark pigeonhole
slot) converted PNG -> WebP, 1.7MB -> 45KB. Used for both win and
loss endings, since the image itself is mood-neutral rather than
victory- or failure-specific — the audit-stamp overlay (TILLSVIDARE
in green, OMPLACERAD/AVFÖRD in red) still carries the actual outcome.

.end-card switched from an opaque panel to a translucent one with a
backdrop blur so the photo is actually visible around and through the
card instead of fully hidden behind it — same fix .seal already
needed on the intro screen.

Verified by injecting all three real end states (clean win,
composure-driven loss, suspicion-maxed loss) and screenshotting each.

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

.gitignore

@@ -3,6 +3,7 @@ dist
 .env
 *.local
 
-# Raw source image — public/intro.webp is the optimized derivative that
+# Raw source images — public/*.webp are the optimized derivatives that
-# actually ships; no need to bloat the repo with the 1.7MB original.
+# actually ship; no need to bloat the repo with the 1.7MB originals.
 /intro.png
+/gameover.png

src/style.css

@@ -81,14 +81,19 @@ button { font: inherit; }
     linear-gradient(rgba(13, 13, 26, 0.6), rgba(13, 13, 26, 0.88)),
     url('/intro.webp') center / cover no-repeat;
 }
+.end-screen {
+  background:
+    linear-gradient(rgba(13, 13, 26, 0.55), rgba(13, 13, 26, 0.85)),
+    url('/gameover.webp') center / cover no-repeat;
+}
 .seal { width: clamp(160px, 25vw, 260px); aspect-ratio: 1; display: grid; place-items: center; border: 8px double var(--stamp); border-radius: 50%; color: var(--stamp); font: 700 clamp(90px, 16vw, 160px)/1 'Special Elite'; transform: rotate(-8deg); opacity: .85; box-shadow: 0 0 60px rgba(217,84,98,.25); background: rgba(13, 13, 26, 0.35); backdrop-filter: blur(1px); }
 .intro-copy h1 { margin: 0; color: var(--stamp); font-size: clamp(52px, 10vw, 92px); letter-spacing: .15em; line-height: 1; }
 .intro-sub { color: var(--dim); font-size: 10px; letter-spacing: .15em; text-transform: uppercase; }
 .intro-copy > p:not(.intro-sub) { color: #b0b0c4; }
-.end-card { width: min(620px, 100%); padding: clamp(24px, 5vw, 50px); border: 1px solid var(--border); background: var(--panel); text-align: center; position: relative; }
+.end-card { width: min(620px, 100%); padding: clamp(24px, 5vw, 50px); border: 1px solid var(--border); background: rgba(18, 18, 31, 0.82); backdrop-filter: blur(2px); text-align: center; position: relative; }
 .end-card h1 { color: var(--text); }
 .end-card > p { color: var(--dim); }
-.audit-stamp { display: inline-block; padding: 8px 16px; border: 3px solid var(--safe); color: var(--safe); font-size: 18px; font-weight: 700; letter-spacing: .12em; transform: rotate(-4deg); }
+.audit-stamp { display: inline-block; padding: 8px 16px; border: 3px solid var(--safe); color: var(--safe); font-size: 18px; font-weight: 700; letter-spacing: .12em; transform: rotate(-4deg); background: rgba(13, 13, 26, 0.3); }
 .failure .audit-stamp { border-color: var(--danger); color: var(--danger); }
 .final-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 25px 0; }
 .final-stats div { padding: 12px; border: 1px solid var(--border); }