feat: Created shared TagList component with max-4 overflow, applied acr…

- "frontend/src/components/TagList.tsx"
- "frontend/src/pages/Home.tsx"
- "frontend/src/pages/SearchResults.tsx"
- "frontend/src/pages/SubTopicPage.tsx"
- "frontend/src/pages/CreatorDetail.tsx"
- "frontend/src/pages/TopicsBrowse.tsx"
- "frontend/src/App.css"

GSD-Task: S02/T03

.gsd/milestones/M011/slices/S02/S02-PLAN.md

@@ -57,7 +57,7 @@
   - Estimate: 20m
   - Files: frontend/src/pages/CreatorDetail.tsx, frontend/src/App.css
   - Verify: cd frontend && npx tsc --noEmit && npm run build
-- [ ] **T03: TagList component, tag overflow limit, and empty subtopic handling** — Create a shared TagList component for tag overflow (R027), apply it across all 5 tag-rendering sites, and add empty subtopic handling in TopicsBrowse (R028).
+- [x] **T03: Created shared TagList component with max-4 overflow, applied across all 5 tag sites, and added empty subtopic Coming soon badge** — Create a shared TagList component for tag overflow (R027), apply it across all 5 tag-rendering sites, and add empty subtopic handling in TopicsBrowse (R028).
 
 ## Steps
 

.gsd/milestones/M011/slices/S02/tasks/T02-VERIFY.json

@@ -0,0 +1,30 @@
+{
+  "schemaVersion": 1,
+  "taskId": "T02",
+  "unitId": "M011/S02/T02",
+  "timestamp": 1774945929488,
+  "passed": false,
+  "discoverySource": "task-plan",
+  "checks": [
+    {
+      "command": "cd frontend",
+      "exitCode": 0,
+      "durationMs": 7,
+      "verdict": "pass"
+    },
+    {
+      "command": "npx tsc --noEmit",
+      "exitCode": 1,
+      "durationMs": 762,
+      "verdict": "fail"
+    },
+    {
+      "command": "npm run build",
+      "exitCode": 254,
+      "durationMs": 89,
+      "verdict": "fail"
+    }
+  ],
+  "retryAttempt": 1,
+  "maxRetries": 2
+}

.gsd/milestones/M011/slices/S02/tasks/T03-SUMMARY.md

@@ -0,0 +1,87 @@
+---
+id: T03
+parent: S02
+milestone: M011
+provides: []
+requires: []
+affects: []
+key_files: ["frontend/src/components/TagList.tsx", "frontend/src/pages/Home.tsx", "frontend/src/pages/SearchResults.tsx", "frontend/src/pages/SubTopicPage.tsx", "frontend/src/pages/CreatorDetail.tsx", "frontend/src/pages/TopicsBrowse.tsx", "frontend/src/App.css"]
+key_decisions: ["Added pillClass prop to TagList so Home.tsx can pass pill--tag while other pages use bare pill class"]
+patterns_established: []
+drill_down_paths: []
+observability_surfaces: []
+duration: ""
+verification_result: "TypeScript compilation (tsc --noEmit) passed with zero errors. Production build (npm run build) succeeded — 51 modules transformed, built in 827ms."
+completed_at: 2026-03-31T08:34:55.792Z
+blocker_discovered: false
+---
+
+# T03: Created shared TagList component with max-4 overflow, applied across all 5 tag sites, and added empty subtopic Coming soon badge
+
+> Created shared TagList component with max-4 overflow, applied across all 5 tag sites, and added empty subtopic Coming soon badge
+
+## What Happened
+---
+id: T03
+parent: S02
+milestone: M011
+key_files:
+  - frontend/src/components/TagList.tsx
+  - frontend/src/pages/Home.tsx
+  - frontend/src/pages/SearchResults.tsx
+  - frontend/src/pages/SubTopicPage.tsx
+  - frontend/src/pages/CreatorDetail.tsx
+  - frontend/src/pages/TopicsBrowse.tsx
+  - frontend/src/App.css
+key_decisions:
+  - Added pillClass prop to TagList so Home.tsx can pass pill--tag while other pages use bare pill class
+duration: ""
+verification_result: passed
+completed_at: 2026-03-31T08:34:55.792Z
+blocker_discovered: false
+---
+
+# T03: Created shared TagList component with max-4 overflow, applied across all 5 tag sites, and added empty subtopic Coming soon badge
+
+**Created shared TagList component with max-4 overflow, applied across all 5 tag sites, and added empty subtopic Coming soon badge**
+
+## What Happened
+
+Created TagList component with configurable max and pillClass props. Replaced all 5 inline topic_tags.map() calls across Home, SearchResults, SubTopicPage, CreatorDetail with the shared component. Added empty subtopic handling in TopicsBrowse — technique_count === 0 renders a non-clickable span with Coming soon pill instead of a Link. Added pill--overflow, pill--coming-soon, and topic-subtopic--empty CSS.
+
+## Verification
+
+TypeScript compilation (tsc --noEmit) passed with zero errors. Production build (npm run build) succeeded — 51 modules transformed, built in 827ms.
+
+## Verification Evidence
+
+| # | Command | Exit Code | Verdict | Duration |
+|---|---------|-----------|---------|----------|
+| 1 | `cd frontend && npx tsc --noEmit` | 0 | ✅ pass | 3600ms |
+| 2 | `cd frontend && npm run build` | 0 | ✅ pass | 2900ms |
+
+
+## Deviations
+
+Added pillClass prop to TagList (not in plan) to preserve existing pill--tag class used in Home.tsx.
+
+## Known Issues
+
+None.
+
+## Files Created/Modified
+
+- `frontend/src/components/TagList.tsx`
+- `frontend/src/pages/Home.tsx`
+- `frontend/src/pages/SearchResults.tsx`
+- `frontend/src/pages/SubTopicPage.tsx`
+- `frontend/src/pages/CreatorDetail.tsx`
+- `frontend/src/pages/TopicsBrowse.tsx`
+- `frontend/src/App.css`
+
+
+## Deviations
+Added pillClass prop to TagList (not in plan) to preserve existing pill--tag class used in Home.tsx.
+
+## Known Issues
+None.

frontend/src/App.css

@@ -1456,6 +1456,19 @@ a.app-footer__repo:hover {
   color: var(--color-pill-plugin-text);
 }
 
+.pill--overflow {
+  background: var(--color-surface-2);
+  color: var(--color-text-secondary);
+  font-style: italic;
+}
+
+.pill--coming-soon {
+  font-size: 0.65rem;
+  background: var(--color-surface-2);
+  color: var(--color-text-secondary);
+  font-style: italic;
+}
+
 .pill-list {
   display: flex;
   flex-wrap: wrap;
@@ -2353,6 +2366,15 @@ a.app-footer__repo:hover {
   background: var(--color-bg-surface-hover);
 }
 
+.topic-subtopic--empty {
+  opacity: 0.5;
+  cursor: default;
+}
+
+.topic-subtopic--empty:hover {
+  background: transparent;
+}
+
 .topic-subtopic + .topic-subtopic {
   border-top: 1px solid var(--color-bg-surface-hover);
 }

frontend/src/components/TagList.tsx

@@ -0,0 +1,33 @@
+/**
+ * Shared tag list with overflow indicator.
+ *
+ * Renders up to `max` tag pills (default 4), plus a "+N more" pill
+ * when the list exceeds the limit. Used across cards and detail pages
+ * to keep tag displays compact and consistent (R027).
+ */
+
+interface TagListProps {
+  tags: string[];
+  max?: number;
+  /** Extra CSS class added to each pill (e.g. "pill--tag") */
+  pillClass?: string;
+}
+
+export default function TagList({ tags, max = 4, pillClass }: TagListProps) {
+  const visible = tags.slice(0, max);
+  const overflow = tags.length - max;
+  const cls = pillClass ? `pill ${pillClass}` : "pill";
+
+  return (
+    <>
+      {visible.map((tag) => (
+        <span key={tag} className={cls}>
+          {tag}
+        </span>
+      ))}
+      {overflow > 0 && (
+        <span className="pill pill--overflow">+{overflow} more</span>
+      )}
+    </>
+  );
+}

frontend/src/pages/CreatorDetail.tsx

@@ -15,6 +15,7 @@ import {
 } from "../api/public-client";
 import CreatorAvatar from "../components/CreatorAvatar";
 import { catSlug } from "../utils/catSlug";
+import TagList from "../components/TagList";
 
 export default function CreatorDetail() {
   const { slug } = useParams<{ slug: string }>();
@@ -156,11 +157,7 @@ export default function CreatorDetail() {
                   </span>
                   {t.topic_tags && t.topic_tags.length > 0 && (
                     <span className="creator-technique-card__tags">
-                      {t.topic_tags.map((tag) => (
-                        <span key={tag} className="pill">
-                          {tag}
-                        </span>
-                      ))}
+                      <TagList tags={t.topic_tags} />
                     </span>
                   )}
                 </span>

frontend/src/pages/Home.tsx

@@ -7,6 +7,7 @@
 
 import { IconTopics, IconCreators } from "../components/CategoryIcons";
 import SearchAutocomplete from "../components/SearchAutocomplete";
+import TagList from "../components/TagList";
 import { useEffect, useState } from "react";
 import { Link, useNavigate } from "react-router-dom";
 import {
@@ -198,9 +199,9 @@ export default function Home() {
             {featured.topic_category && (
               <span className="badge badge--category">{featured.topic_category}</span>
             )}
-            {featured.topic_tags && featured.topic_tags.length > 0 && featured.topic_tags.map(tag => (
-              <span key={tag} className="pill pill--tag">{tag}</span>
-            ))}
+            {featured.topic_tags && featured.topic_tags.length > 0 && (
+              <TagList tags={featured.topic_tags} pillClass="pill--tag" />
+            )}
             {featured.key_moment_count > 0 && (
               <span className="home-featured__moments">
                 {featured.key_moment_count} moment{featured.key_moment_count !== 1 ? "s" : ""}
@@ -244,9 +245,9 @@ export default function Home() {
                   <span className="badge badge--category">
                     {t.topic_category}
                   </span>
-                  {t.topic_tags && t.topic_tags.length > 0 && t.topic_tags.map(tag => (
-                    <span key={tag} className="pill pill--tag">{tag}</span>
-                  ))}
+                  {t.topic_tags && t.topic_tags.length > 0 && (
+                    <TagList tags={t.topic_tags} pillClass="pill--tag" />
+                  )}
                   {t.summary && (
                     <span className="recent-card__summary">
                       {t.summary.length > 150

frontend/src/pages/SearchResults.tsx

@@ -11,6 +11,7 @@ import { Link, useSearchParams, useNavigate } from "react-router-dom";
 import { searchApi, type SearchResultItem } from "../api/public-client";
 import { catSlug } from "../utils/catSlug";
 import SearchAutocomplete from "../components/SearchAutocomplete";
+import TagList from "../components/TagList";
 
 export default function SearchResults() {
   const [searchParams] = useSearchParams();
@@ -142,11 +143,7 @@ function SearchResultCard({ item, staggerIndex }: { item: SearchResultItem; stag
         )}
         {item.topic_tags.length > 0 && (
           <span className="search-result-card__tags">
-            {item.topic_tags.map((tag) => (
-              <span key={tag} className="pill">
-                {tag}
-              </span>
-            ))}
+            <TagList tags={item.topic_tags} />
           </span>
         )}
       </div>

frontend/src/pages/SubTopicPage.tsx

@@ -12,6 +12,7 @@ import {
   type TechniqueListItem,
 } from "../api/public-client";
 import { catSlug } from "../utils/catSlug";
+import TagList from "../components/TagList";
 
 /** Convert a URL slug to a display name: replace hyphens with spaces, title-case. */
 function slugToDisplayName(slug: string): string {
@@ -146,9 +147,7 @@ export default function SubTopicPage() {
                     <span className="subtopic-technique-card__title">{t.title}</span>
                     {t.topic_tags && t.topic_tags.length > 0 && (
                       <span className="subtopic-technique-card__tags">
-                        {t.topic_tags.map((tag) => (
-                          <span key={tag} className="pill">{tag}</span>
-                        ))}
+                        <TagList tags={t.topic_tags} />
                       </span>
                     )}
                     {t.summary && (

frontend/src/pages/TopicsBrowse.tsx

@@ -155,6 +155,19 @@ export default function TopicsBrowse() {
                   <div className="topic-subtopics">
                     {cat.sub_topics.map((st) => {
                       const stSlug = st.name.toLowerCase().replace(/\s+/g, "-");
+                      if (st.technique_count === 0) {
+                        return (
+                          <span
+                            key={st.name}
+                            className="topic-subtopic topic-subtopic--empty"
+                          >
+                            <span className="topic-subtopic__name">{st.name}</span>
+                            <span className="topic-subtopic__counts">
+                              <span className="pill pill--coming-soon">Coming soon</span>
+                            </span>
+                          </span>
+                        );
+                      }
                       return (
                       <Link
                         key={st.name}

frontend/tsconfig.app.tsbuildinfo

@@ -1 +1 @@
-{"root":["./src/App.tsx","./src/main.tsx","./src/vite-env.d.ts","./src/api/public-client.ts","./src/components/AdminDropdown.tsx","./src/components/AppFooter.tsx","./src/components/CategoryIcons.tsx","./src/components/CopyLinkButton.tsx","./src/components/CreatorAvatar.tsx","./src/components/ReportIssueModal.tsx","./src/components/SearchAutocomplete.tsx","./src/pages/About.tsx","./src/pages/AdminPipeline.tsx","./src/pages/AdminReports.tsx","./src/pages/CreatorDetail.tsx","./src/pages/CreatorsBrowse.tsx","./src/pages/Home.tsx","./src/pages/SearchResults.tsx","./src/pages/SubTopicPage.tsx","./src/pages/TechniquePage.tsx","./src/pages/TopicsBrowse.tsx","./src/utils/catSlug.ts"],"version":"5.6.3"}
+{"root":["./src/App.tsx","./src/main.tsx","./src/vite-env.d.ts","./src/api/public-client.ts","./src/components/AdminDropdown.tsx","./src/components/AppFooter.tsx","./src/components/CategoryIcons.tsx","./src/components/CopyLinkButton.tsx","./src/components/CreatorAvatar.tsx","./src/components/ReportIssueModal.tsx","./src/components/SearchAutocomplete.tsx","./src/components/TagList.tsx","./src/pages/About.tsx","./src/pages/AdminPipeline.tsx","./src/pages/AdminReports.tsx","./src/pages/CreatorDetail.tsx","./src/pages/CreatorsBrowse.tsx","./src/pages/Home.tsx","./src/pages/SearchResults.tsx","./src/pages/SubTopicPage.tsx","./src/pages/TechniquePage.tsx","./src/pages/TopicsBrowse.tsx","./src/utils/catSlug.ts"],"version":"5.6.3"}