feat(web): unify semantic empty states

vehicle-data-platform/apps/web/src/v2/styles/workspace.css

@@ -27344,3 +27344,184 @@
     line-height: 14px;
   }
 }
+
+/*
+ * Semi UI semantic panel states.
+ * Empty evidence surfaces share one visual and interaction contract instead
+ * of inheriting page-specific illustrations, spacing and typography.
+ */
+.v2-state-surface.is-empty {
+  --v2-state-accent: #70839a;
+  --v2-state-soft: #f4f7fa;
+  --v2-state-border: #dfe6ee;
+  position: relative;
+  display: flex;
+  width: 100%;
+  min-width: 0;
+  min-height: 190px;
+  align-items: center;
+  justify-content: center;
+  overflow: hidden;
+  border: 1px solid var(--v2-state-border);
+  border-radius: 10px;
+  background: linear-gradient(180deg, var(--v2-state-soft) 0, #fff 58%);
+  padding: 18px;
+}
+
+.v2-state-surface.is-empty::before {
+  position: absolute;
+  z-index: 0;
+  top: 0;
+  right: 0;
+  left: 0;
+  height: 2px;
+  background: var(--v2-state-accent);
+  content: "";
+  opacity: .88;
+}
+
+.v2-state-surface.is-empty.tone-primary {
+  --v2-state-accent: #1769dc;
+  --v2-state-soft: #f2f7ff;
+  --v2-state-border: #d7e5f8;
+}
+
+.v2-state-surface.is-empty.tone-success {
+  --v2-state-accent: #1b9b6a;
+  --v2-state-soft: #f2faf7;
+  --v2-state-border: #d7ece4;
+}
+
+.v2-state-surface.is-empty.tone-warning {
+  --v2-state-accent: #d88622;
+  --v2-state-soft: #fff8ef;
+  --v2-state-border: #f0e0ca;
+}
+
+.v2-state-surface.is-empty.tone-danger {
+  --v2-state-accent: #d54c4c;
+  --v2-state-soft: #fff5f5;
+  --v2-state-border: #f0d7d7;
+}
+
+.v2-state-surface.is-empty > .v2-state-empty.semi-empty {
+  position: relative;
+  z-index: 1;
+  min-height: 0;
+  padding: 4px;
+}
+
+.v2-state-surface.is-empty > .v2-state-empty .semi-empty-image {
+  display: grid !important;
+  width: auto;
+  height: auto;
+  place-items: center;
+  margin: 0 0 12px;
+  opacity: 1;
+}
+
+.v2-state-empty-icon {
+  display: grid;
+  width: 48px;
+  height: 48px;
+  place-items: center;
+  border: 1px solid var(--v2-state-border);
+  border-radius: 14px;
+  background: #fff;
+  color: var(--v2-state-accent);
+  box-shadow: 0 8px 18px rgba(38, 58, 82, .08);
+}
+
+.v2-state-empty-icon .semi-icon {
+  font-size: 21px;
+}
+
+.v2-state-surface.is-empty > .v2-state-empty .semi-empty-title {
+  margin-top: 0;
+  color: #2f435a;
+  font-size: 14px;
+  font-weight: 760;
+  letter-spacing: -.01em;
+}
+
+.v2-state-surface.is-empty > .v2-state-empty .semi-empty-description {
+  max-width: 460px;
+  margin-top: 6px;
+  color: #77869a;
+  font-size: 11px;
+  line-height: 1.6;
+}
+
+.v2-state-surface.is-empty > .v2-state-empty .semi-empty-content {
+  margin-top: 15px;
+}
+
+.v2-state-surface.is-empty > .v2-state-empty .semi-empty-content > .semi-button {
+  min-height: 34px;
+  border-radius: 8px;
+  padding-inline: 15px;
+  font-weight: 700;
+}
+
+.v2-state-surface.is-empty.is-panel.is-compact {
+  position: relative;
+  top: auto;
+  min-height: 112px;
+  border-bottom: 1px solid var(--v2-state-border);
+  background: linear-gradient(180deg, var(--v2-state-soft) 0, #fff 72%);
+  padding: 10px 12px;
+  backdrop-filter: none;
+}
+
+.v2-state-surface.is-empty.is-compact > .v2-state-empty .semi-empty-image {
+  margin-bottom: 7px;
+}
+
+.v2-state-surface.is-empty.is-compact .v2-state-empty-icon {
+  width: 36px;
+  height: 36px;
+  border-radius: 10px;
+  box-shadow: 0 5px 12px rgba(38, 58, 82, .06);
+}
+
+.v2-state-surface.is-empty.is-compact .v2-state-empty-icon .semi-icon {
+  font-size: 17px;
+}
+
+.v2-state-surface.is-empty.is-compact > .v2-state-empty .semi-empty-title {
+  font-size: 12px;
+}
+
+.v2-state-surface.is-empty.is-compact > .v2-state-empty .semi-empty-description {
+  margin-top: 3px;
+  font-size: 9px;
+  line-height: 1.5;
+}
+
+.v2-vehicle-recent-card > .semi-card-body > .v2-state-surface.v2-vehicle-recent-empty {
+  min-height: 0;
+  flex: 1 1 auto;
+  border: 0;
+  border-radius: 0;
+}
+
+@media (max-width: 680px) {
+  .v2-state-surface.is-empty {
+    min-height: 170px;
+    padding: 15px 12px;
+  }
+
+  .v2-state-surface.is-empty > .v2-state-empty .semi-empty-title {
+    font-size: 13px;
+  }
+
+  .v2-state-surface.is-empty > .v2-state-empty .semi-empty-description {
+    max-width: 300px;
+    font-size: 10px;
+  }
+
+  .v2-state-surface.is-empty.is-panel.is-compact {
+    min-height: 104px;
+    padding: 9px 10px;
+  }
+}