feat(skills): fix browse cap, add source links + copy buttons + category cleanup (#37143)

Skills discovery surfaced ~136 of 88k skills in the CLI and gave community
skills no clickable source on the docs page. Three coupled fixes:

CLI browse:
- hermes skills browse capped at 50 because the per-source limit dict had no
  'hermes-index' key — when the centralized index is available the router
  skips external APIs and serves only the index, so the default-50 fallthrough
  silently truncated the whole hub. Add hermes-index: 5000. Browse now loads
  5367 (269 pages) instead of 136.
- Add an Identifier column + install/inspect hint to the browse table so users
  can act on what they see without a second 'search'.
- Route the TUI browse_skills() helper through parallel_search_sources so it
  inherits the same index-aware source-skip (was double-counting); expose
  identifier in its output.

Docs Skills Hub page:
- Synthesize a sourceUrl for every community skill (github tree URL, clawhub /
  skills.sh / lobehub / browse.sh detail pages), preferring the adapter's
  explicit extra.detail_url/source_url/repo_url. Expanded cards now show
  'View source' for community skills (was nothing) and keep 'View full
  documentation' for built-in/optional. 99% coverage.
- Add a Copy button on the install command.
- Add a loading state instead of flashing '0 skills / No skills found' while
  the 45MB catalog fetches.

Category cleanup:
- _guess_category fell back to tags[0] verbatim, producing ~430 junk one-off
  categories (version strings, brand names: '0.10.7 Dev', 'Doramagic Crystal').
  Now only curated buckets are accepted; unknowns fold into 'Other'. Widen the
  tag->category map so common community tags route to real buckets. 430 -> 173
  categories, top 20 all meaningful.

Tests: tests/website/test_extract_skills.py covers _source_url synthesis +
precedence and _guess_category curation (13 tests). All 27 skills-hub CLI
tests still pass. Docusaurus build verified; expanded cards confirmed in
browser for both community (View source) and built-in (View full docs).

website/src/pages/skills/index.tsx

@@ -19,6 +19,10 @@ interface Skill {
   docsPath?: string;
   identifier?: string;
   installCmd?: string;
+  /** Clickable URL to the skill's origin (repo / detail page). Synthesized
+   *  in extract-skills.py for community skills that have no generated docs
+   *  page, so the expanded card always has somewhere to send the user. */
+  sourceUrl?: string;
   /** Lowercase pre-joined haystack used by the search filter.
    *  Built once at load time so per-keystroke filtering is a single
    *  `.includes()` per skill instead of array-join + toLowerCase on
@@ -240,6 +244,47 @@ function highlightMatch(text: string, query: string): React.ReactNode {
   );
 }
 
+function CopyButton({ text }: { text: string }) {
+  const [copied, setCopied] = useState(false);
+  const onCopy = useCallback(
+    (e: React.MouseEvent) => {
+      e.stopPropagation();
+      navigator.clipboard?.writeText(text).then(
+        () => {
+          setCopied(true);
+          setTimeout(() => setCopied(false), 1500);
+        },
+        () => {},
+      );
+    },
+    [text],
+  );
+  return (
+    <button
+      className={styles.copyBtn}
+      onClick={onCopy}
+      title="Copy install command"
+      aria-label="Copy install command"
+    >
+      {copied ? (
+        <svg viewBox="0 0 20 20" fill="currentColor" width="14" height="14">
+          <path
+            fillRule="evenodd"
+            d="M16.704 4.153a.75.75 0 01.143 1.052l-8 10.5a.75.75 0 01-1.127.075l-4.5-4.5a.75.75 0 011.06-1.06l3.894 3.893 7.48-9.817a.75.75 0 011.05-.143z"
+            clipRule="evenodd"
+          />
+        </svg>
+      ) : (
+        <svg viewBox="0 0 20 20" fill="currentColor" width="14" height="14">
+          <path d="M7 3.5A1.5 1.5 0 018.5 2h3.879a1.5 1.5 0 011.06.44l3.122 3.12A1.5 1.5 0 0117 6.622V12.5a1.5 1.5 0 01-1.5 1.5h-1v-3.379a3 3 0 00-.879-2.121L10.5 5.379A3 3 0 008.379 4.5H7v-1z" />
+          <path d="M4.5 6A1.5 1.5 0 003 7.5v9A1.5 1.5 0 004.5 18h7a1.5 1.5 0 001.5-1.5v-5.879a1.5 1.5 0 00-.44-1.06L9.44 6.439A1.5 1.5 0 008.378 6H4.5z" />
+        </svg>
+      )}
+      <span className={styles.copyBtnLabel}>{copied ? "Copied" : "Copy"}</span>
+    </button>
+  );
+}
+
 function SkillCard({
   skill,
   query,
@@ -379,16 +424,31 @@ function SkillCard({
             )}
             <div className={styles.installHint}>
               <code>{skill.installCmd || `hermes skills install ${skill.name}`}</code>
+              <CopyButton
+                text={skill.installCmd || `hermes skills install ${skill.name}`}
+              />
+            </div>
+            <div className={styles.cardLinks}>
+              {skill.docsPath ? (
+                <a
+                  className={styles.docsLink}
+                  href={`/docs/user-guide/skills/${skill.docsPath}`}
+                  onClick={(e) => e.stopPropagation()}
+                >
+                  View full documentation →
+                </a>
+              ) : skill.sourceUrl ? (
+                <a
+                  className={styles.docsLink}
+                  href={skill.sourceUrl}
+                  target="_blank"
+                  rel="noopener noreferrer"
+                  onClick={(e) => e.stopPropagation()}
+                >
+                  View source ↗
+                </a>
+              ) : null}
             </div>
-            {skill.docsPath && (
-              <a
-                className={styles.docsLink}
-                href={`/docs/user-guide/skills/${skill.docsPath}`}
-                onClick={(e) => e.stopPropagation()}
-              >
-                View full documentation →
-              </a>
-            )}
           </div>
         )}
       </div>
@@ -792,7 +852,15 @@ export default function SkillsDashboard() {
               </div>
             )}
 
-            {visible.length > 0 ? (
+            {!data && !loadError ? (
+              <div className={styles.empty}>
+                <div className={styles.loadingSpinner} />
+                <h3 className={styles.emptyTitle}>Loading the catalog…</h3>
+                <p className={styles.emptyDesc}>
+                  Fetching 88k+ skills across every registry. One moment.
+                </p>
+              </div>
+            ) : visible.length > 0 ? (
               <>
                 <div className={styles.grid}>
                   {visible.map((skill, i) => {

website/src/pages/skills/styles.module.css

@@ -628,6 +628,9 @@
   background: rgba(0, 0, 0, 0.25);
   border: 1px solid rgba(255, 215, 0, 0.06);
   border-radius: 5px;
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
 }
 
 .installHint code {
@@ -636,6 +639,64 @@
   color: rgba(255, 215, 0, 0.7);
   background: none;
   padding: 0;
+  flex: 1;
+  overflow-x: auto;
+  white-space: nowrap;
+  scrollbar-width: none;
+}
+
+.installHint code::-webkit-scrollbar {
+  display: none;
+}
+
+.copyBtn {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.25rem;
+  flex-shrink: 0;
+  padding: 0.2rem 0.45rem;
+  border: 1px solid rgba(255, 215, 0, 0.18);
+  border-radius: 4px;
+  background: rgba(255, 215, 0, 0.06);
+  color: rgba(255, 215, 0, 0.85);
+  font-size: 0.68rem;
+  font-weight: 600;
+  cursor: pointer;
+  transition: all 0.15s;
+}
+
+.copyBtn:hover {
+  background: rgba(255, 215, 0, 0.14);
+  color: rgba(255, 215, 0, 1);
+}
+
+.copyBtnLabel {
+  line-height: 1;
+}
+
+.cardLinks {
+  display: flex;
+  gap: 0.5rem;
+}
+
+.cardLinks .docsLink {
+  flex: 1;
+}
+
+.loadingSpinner {
+  width: 2.25rem;
+  height: 2.25rem;
+  margin: 0 auto 1rem;
+  border: 3px solid rgba(255, 215, 0, 0.15);
+  border-top-color: rgba(255, 215, 0, 0.7);
+  border-radius: 50%;
+  animation: skillsSpin 0.8s linear infinite;
+}
+
+@keyframes skillsSpin {
+  to {
+    transform: rotate(360deg);
+  }
 }
 
 .overviewBlock {