Initial Foundry module scaffold

styles/configurable-reactions.css

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+.configurable-reactions .cr-config {
+  display: flex;
+  flex-direction: column;
+  gap: 0.75rem;
+  height: 100%;
+}
+
+.configurable-reactions .cr-header,
+.configurable-reactions .cr-footer {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 0.5rem;
+}
+
+.configurable-reactions .cr-grid {
+  display: grid;
+  grid-template-columns: 280px 1fr;
+  gap: 1rem;
+  min-height: 0;
+  height: 100%;
+}
+
+.configurable-reactions .cr-sidebar,
+.configurable-reactions .cr-main {
+  min-height: 0;
+  overflow: auto;
+}
+
+.configurable-reactions .cr-button-column {
+  display: flex;
+  flex-direction: column;
+  gap: 0.35rem;
+  margin: 0.75rem 0;
+}
+
+.configurable-reactions .cr-assignment-list {
+  display: flex;
+  flex-direction: column;
+  gap: 0.35rem;
+  padding: 0;
+  margin: 0;
+  list-style: none;
+}
+
+.configurable-reactions .cr-assignment-list li {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 0.5rem;
+  border: 1px solid var(--color-border-light-tertiary, #888);
+  border-radius: 4px;
+  padding: 0.35rem;
+}
+
+.configurable-reactions .cr-assignment-list small {
+  display: block;
+  opacity: 0.8;
+}
+
+.configurable-reactions .cr-main textarea[name="reactionJson"] {
+  width: 100%;
+  min-height: 430px;
+  font-family: var(--font-monospace, monospace);
+  resize: vertical;
+}
+
+.configurable-reactions .cr-reaction-summary {
+  border: 1px solid var(--color-border-light-tertiary, #888);
+  border-radius: 4px;
+  padding: 0.5rem;
+  margin-bottom: 0.75rem;
+}
+
+.configurable-reactions .form-group.stacked {
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+}