feat: add account menu and redirect after Q&A logout

Add the top-right account icon with the signed-in name and logout link. Expire the Q&A session before redirecting to the configured inquiry homepage in both environments. Preserve login return URL checks and ignore request-controlled logout destinations.

Validation: 106 tests, syntax checks, and mocked Chromium desktop/mobile regressions pass, including session-cookie removal and the destination navigation request with external networking blocked.

assets/inquiry/inquiry.css

@@ -8,6 +8,17 @@
 .inquiry-hero__copy { height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; color: #fff; text-align: center; padding: 40px 24px; }
 .inquiry-hero h1 { font-size: 70px; font-weight: 700; line-height: 1.4; letter-spacing: -0.04em; }
 .inquiry-hero p { font-size: 22px; line-height: 1.6; }
+.inquiry-account { position: absolute; top: 24px; right: 32px; z-index: 3; color: #fff; }
+.inquiry-account summary { display: flex; align-items: center; justify-content: center; width: 44px; height: 44px; border: 1px solid #ffffff99; border-radius: 50%; background: #0b274366; cursor: pointer; list-style: none; }
+.inquiry-account summary::-webkit-details-marker { display: none; }
+.inquiry-account summary:hover, .inquiry-account[open] summary { background: #0b2743b3; }
+.inquiry-account summary:focus-visible { outline-color: #fff; }
+.inquiry-account svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
+.inquiry-account__panel { position: absolute; top: 54px; right: 0; width: 192px; padding: 8px; border: 1px solid #e5e9ef; border-radius: 10px; background: #fff; color: #26374f; box-shadow: 0 8px 28px #0003; }
+.inquiry-hero .inquiry-account__panel p { overflow: hidden; padding: 10px 12px; color: #697386; font-size: 13px; white-space: nowrap; text-overflow: ellipsis; }
+.inquiry-account__panel a { display: flex; align-items: center; gap: 8px; min-height: 44px; padding: 10px 12px; border-radius: 6px; font-size: 14px; }
+.inquiry-account__panel a:hover { background: #edf3fd; color: #164b91; }
+.inquiry-account__panel a svg { width: 18px; height: 18px; }
 .inquiry-workspace { position: relative; z-index: 1; width: min(1248px, 100%); padding: 0 24px; margin: -98px auto 120px; }
 .inquiry-tabs-shell { --inquiry-tab-curve: 28px; padding: 19px 32px 0; border-radius: 48px 48px 0 0; background: linear-gradient(180deg, #174b64a6, #082f43d9); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); box-shadow: inset 0 1px 0 #74c7f4b3, inset 0 0 0 1px #5fadd666, inset 0 8px 16px #ffffff12, 0 -18px 12px #0a2f4843; }
 .inquiry-tabs { display: flex; justify-content: center; gap: 60px; position: relative; isolation: isolate; }
@@ -116,6 +127,7 @@ html.inquiry-modal-open body { overflow: hidden !important; }
   .inquiry-hero { --inquiry-hero-shade: rgba(5, 24, 44, 0.38); height: 340px; background-position: 22% center; }
   .inquiry-hero h1 { font-size: 48px; }
   .inquiry-hero p { font-size: 17px; }
+  .inquiry-account { top: 16px; right: 16px; }
   .inquiry-workspace { margin: -96px auto 72px; padding: 0 16px; }
   .inquiry-tabs-shell { --inquiry-tab-curve: 13px; padding: 12px 13px 0; border-radius: 30px 30px 0 0; }
   .inquiry-tabs { gap: 5px; }