feat(color): add hex code display and click-to-copy functionality

Enhances SpoolIcon component with optional showHex prop:
- Displays hex color code next to swatch when enabled
- Click to copy hex code to clipboard
- Shows tooltip with copy hint
- Supports both single and multi-color filaments

Enabled on detail pages:
- Filament show page
- Spool show page

Added translation keys for copy feedback messages.

Closes #33

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

client/public/locales/en/common.json

@@ -52,6 +52,11 @@
         "validationError": "Validation error: {{error}}"
     },
     "kofi": "Tip me on Ko-fi",
+    "color": {
+        "click_to_copy": "Click to copy",
+        "copied": "Copied {{color}} to clipboard",
+        "copy_failed": "Failed to copy to clipboard"
+    },
     "loading": "Loading",
     "version": "Version",
     "unknown": "Unknown",

client/src/components/spoolIcon.tsx

@@ -1,16 +1,21 @@
+import { CopyOutlined } from "@ant-design/icons";
+import { message, Tooltip } from "antd";
+import { useTranslate } from "@refinedev/core";
 import "./spoolIcon.css";
 
 interface Props {
   color: string | { colors: string[]; vertical: boolean };
   size?: "small" | "large";
-  no_margin? : boolean
+  no_margin?: boolean;
+  showHex?: boolean;
 }
 
 export default function SpoolIcon(props: Readonly<Props>) {
+  const t = useTranslate();
   let dirClass = "vertical";
-  let cols = [];
+  let cols: string[] = [];
-  let size = props.size ? props.size : "small";
+  const size = props.size ? props.size : "small";
-  let no_margin = props.no_margin ? "no-margin" : "";
+  const no_margin = props.no_margin ? "no-margin" : "";
 
   if (typeof props.color === "string") {
     cols = [props.color];
@@ -19,16 +24,49 @@ export default function SpoolIcon(props: Readonly<Props>) {
     cols = props.color.colors;
   }
 
-  return (
+  // Normalize hex codes (remove # if present, uppercase)
+  const normalizedCols = cols.map((col) => col.replace("#", "").toUpperCase());
+  const hexDisplay = normalizedCols.length === 1 ? `#${normalizedCols[0]}` : normalizedCols.map((c) => `#${c}`).join(", ");
+
+  const copyToClipboard = async () => {
+    try {
+      await navigator.clipboard.writeText(hexDisplay);
+      message.success(t("color.copied", { color: hexDisplay }));
+    } catch {
+      message.error(t("color.copy_failed"));
+    }
+  };
+
+  const swatchContent = (
     <div className={"spool-icon " + dirClass + " " + size + " " + no_margin}>
-      {cols.map((col) => (
+      {normalizedCols.map((col) => (
         <div
           key={col}
           style={{
-            backgroundColor: "#" + col.replace("#", ""),
+            backgroundColor: "#" + col,
           }}
         ></div>
       ))}
     </div>
   );
+
+  if (props.showHex) {
+    return (
+      <Tooltip title={`${t("color.click_to_copy")}: ${hexDisplay}`}>
+        <div
+          className="spool-icon-with-hex"
+          onClick={copyToClipboard}
+          style={{ cursor: "pointer", display: "inline-flex", alignItems: "center", gap: 8 }}
+        >
+          {swatchContent}
+          <span className="hex-code" style={{ fontFamily: "monospace", fontSize: "0.85em", opacity: 0.8 }}>
+            {hexDisplay}
+            <CopyOutlined style={{ marginLeft: 4, fontSize: "0.9em" }} />
+          </span>
+        </div>
+      </Tooltip>
+    );
+  }
+
+  return swatchContent;
 }

client/src/pages/filaments/show.tsx

@@ -88,8 +88,7 @@ export const FilamentShow: React.FC<IResourceComponentsProps> = () => {
       <Title level={5}>{t("filament.fields.name")}</Title>
       <TextField value={record?.name} />
       <Title level={5}>{t("filament.fields.color_hex")}</Title>
-      {colorObj && <SpoolIcon color={colorObj} size="large" no_margin />}
+      {colorObj && <SpoolIcon color={colorObj} size="large" no_margin showHex />}
-      {record?.color_hex && <TextField value={`#${record?.color_hex}`} />}
       <Title level={5}>{t("filament.fields.material")}</Title>
       <TextField value={record?.material} />
       <Title level={5}>{t("filament.fields.price")}</Title>

client/src/pages/spools/show.tsx

@@ -163,7 +163,7 @@ export const SpoolShow: React.FC<IResourceComponentsProps> = () => {
       <Title level={5}>{t("spool.fields.id")}</Title>
       <NumberField value={record?.id ?? ""} />
       <Title level={5}>{t("spool.fields.filament")}</Title>
-      {colorObj && <SpoolIcon color={colorObj} size="large" no_margin />}
+      {colorObj && <SpoolIcon color={colorObj} size="large" no_margin showHex />}
       <TextField value={record ? filamentURL(record?.filament) : ""} />
       <Title level={5}>{t("spool.fields.price")}</Title>
       <TextField value={spoolPrice(record)} />