feat: Created AdminDropdown component with click-outside/Escape close,…

- "frontend/src/components/AdminDropdown.tsx"
- "frontend/src/App.tsx"
- "frontend/src/App.css"

GSD-Task: S01/T01

.gsd/milestones/M006/M006-ROADMAP.md

@@ -0,0 +1,14 @@
+# M006: 
+
+## Vision
+Consolidate admin navigation into a dropdown, add head/tail log viewing and commit SHA tracking to the pipeline, clean up technique page tag styling and sidebar order, redesign the Topics browse page with a Music Theory category, and add app version footer.
+
+## Slice Overview
+| ID | Slice | Risk | Depends | Done | After this |
+|----|-------|------|---------|------|------------|
+| S01 | Admin Navigation Dropdown + Header Cleanup | low | — | ⬜ | Header shows Home, Topics, Creators, and an Admin dropdown. Clicking Admin reveals Review, Reports, Pipeline links. ModeToggle removed from header. |
+| S02 | Pipeline Page: Head/Tail Log View + Token Count | low | — | ⬜ | Pipeline event log shows Head/Tail toggle buttons. Head shows first N events, Tail shows last N events. Token counts visible per event and per video. |
+| S03 | Git Commit SHA in Pipeline Version Metadata | low | — | ⬜ | Running the pipeline captures the current git commit SHA. Viewing a technique page version shows the commit hash in the metadata panel. |
+| S04 | Technique Page: Sidebar Reorder, Creator Emphasis, Tag Polish | medium | — | ⬜ | Technique page sidebar shows Plugins Referenced at top. Creator name is visually prominent. Tags use a coherent color system. |
+| S05 | Topics Page Redesign + Music Theory Category | high | — | ⬜ | Topics page shows 7 categories (including Music Theory) with an improved visual layout — category cards with descriptions, sub-topic counts, better structure. |
+| S06 | App Footer with Version Info | low | — | ⬜ | Every page shows a subtle footer with app version, build date, and optional repo link. |

.gsd/milestones/M006/slices/S01/S01-PLAN.md

@@ -0,0 +1,34 @@
+# S01: Admin Navigation Dropdown + Header Cleanup
+
+**Goal:** Header nav shows Home, Topics, Creators as flat links and an Admin dropdown. Clicking Admin reveals Review, Reports, Pipeline links. ModeToggle removed from header (kept on ReviewQueue page).
+**Demo:** After this: Header shows Home, Topics, Creators, and an Admin dropdown. Clicking Admin reveals Review, Reports, Pipeline links. ModeToggle removed from header.
+
+## Tasks
+- [x] **T01: Created AdminDropdown component with click-outside/Escape close, wired into App.tsx header replacing 3 admin links + ModeToggle, added dropdown CSS using existing theme tokens** — Create an AdminDropdown React component, replace the 3 admin nav links and ModeToggle in App.tsx, and add dropdown CSS to App.css.
+
+**Context:** The header in `App.tsx` currently has 6 flat `<Link>` elements (Home, Topics, Creators, Review, Reports, Pipeline) plus a `<ModeToggle />`. Goal: group the 3 admin links behind an "Admin" dropdown, remove ModeToggle from the header. ModeToggle is still used by `ReviewQueue.tsx` — do NOT delete the component or its CSS.
+
+**Click-outside pattern** — adapt from `Home.tsx` (typeahead):
+```tsx
+const dropdownRef = useRef<HTMLDivElement>(null);
+useEffect(() => {
+  function handler(e: MouseEvent) {
+    if (dropdownRef.current && !dropdownRef.current.contains(e.target as Node)) {
+      setOpen(false);
+    }
+  }
+  document.addEventListener("mousedown", handler);
+  return () => document.removeEventListener("mousedown", handler);
+}, []);
+```
+
+**CSS variables available** (all defined in App.css `:root`):
+- Trigger text: `--color-text-on-header` / `--color-text-on-header-hover`
+- Dropdown background: `--color-bg-surface`
+- Border: `--color-border`
+- Shadow: `--color-shadow-heavy`
+- Item hover bg: `--color-bg-surface-hover`
+- Item text: `--color-text-primary`
+  - Estimate: 30m
+  - Files: frontend/src/components/AdminDropdown.tsx, frontend/src/App.tsx, frontend/src/App.css
+  - Verify: cd frontend && npx tsc --noEmit && npx vite build

.gsd/milestones/M006/slices/S01/S01-RESEARCH.md

@@ -0,0 +1,124 @@
+# S01 Research — Admin Navigation Dropdown + Header Cleanup
+
+## Summary
+
+Straightforward frontend slice. The header nav in `App.tsx` currently shows 6 flat links (Home, Topics, Creators, Review, Reports, Pipeline) plus a `ModeToggle` component. The goal: group the 3 admin links (Review, Reports, Pipeline) behind an "Admin" dropdown, and remove `ModeToggle` from the header (it stays on the ReviewQueue page).
+
+No new dependencies needed. No backend changes. No library lookups required — the codebase already has a click-outside dropdown pattern in `Home.tsx` (typeahead) that can be adapted.
+
+## Recommendation
+
+Single task. All changes are in 2 files (`App.tsx`, `App.css`) plus optionally extracting the dropdown into a small component. The ModeToggle component file itself is NOT deleted — it's still imported by `ReviewQueue.tsx`.
+
+## Implementation Landscape
+
+### Current State
+
+**`frontend/src/App.tsx`** — The app shell. Header contains:
+- Brand link (`<Link to="/">Chrysopedia</Link>`)
+- `<div className="app-header__right">` containing:
+  - `<nav className="app-nav">` with 6 `<Link>` elements: Home, Topics, Creators, Review, Reports, Pipeline
+  - `<ModeToggle />` component
+
+**`frontend/src/components/ModeToggle.tsx`** — Review/auto mode toggle. Imported in:
+1. `App.tsx` line 12 (header — **remove this usage**)
+2. `ReviewQueue.tsx` line 16 (page body — **keep this usage**)
+
+**`frontend/src/App.css`** — All styles. Relevant sections:
+- `.app-header` — flex row, space-between, dark background (`--color-bg-header`)
+- `.app-header__right` — flex, gap 1.5rem
+- `.app-nav` — flex, gap 1rem, links styled with `--color-text-on-header`
+- `.mode-toggle` — all mode toggle styles (lines 425-488) — **keep these** (ReviewQueue still uses them)
+
+### Target State
+
+Header nav shows: `Home | Topics | Creators | Admin ▾`
+
+Clicking "Admin" reveals a small dropdown with: Review, Reports, Pipeline.
+
+ModeToggle removed from the header entirely.
+
+### Existing Dropdown Pattern
+
+`Home.tsx` uses a click-outside-to-close pattern:
+```
+const dropdownRef = useRef<HTMLDivElement>(null);
+useEffect(() => {
+  function handler(e: MouseEvent) {
+    if (dropdownRef.current && !dropdownRef.current.contains(e.target as Node)) {
+      setShowDropdown(false);
+    }
+  }
+  document.addEventListener("mousedown", handler);
+  return () => document.removeEventListener("mousedown", handler);
+}, []);
+```
+
+### Approach
+
+1. **Create `AdminDropdown` component** (`frontend/src/components/AdminDropdown.tsx`):
+   - `useState<boolean>` for open/closed
+   - `useRef<HTMLDivElement>` for click-outside detection (same pattern as Home.tsx typeahead)
+   - Button that says "Admin" with a chevron indicator
+   - Dropdown panel with 3 `<Link>` items: Review, Reports, Pipeline
+   - Close dropdown on link click and on outside click
+   - Close on Escape key for accessibility
+
+2. **Edit `App.tsx`**:
+   - Remove `ModeToggle` import
+   - Remove `<ModeToggle />` from header JSX
+   - Import `AdminDropdown`
+   - Replace the 3 admin `<Link>` elements with `<AdminDropdown />`
+   - Keep Home, Topics, Creators as flat links
+
+3. **Add CSS to `App.css`**:
+   - `.admin-dropdown` — relative positioning container
+   - `.admin-dropdown__trigger` — styled like existing nav links (same font-size, color, transitions)
+   - `.admin-dropdown__menu` — absolute positioned panel below trigger, dark surface background, border, shadow, border-radius
+   - `.admin-dropdown__item` — block links with padding, hover state
+   - Use existing CSS variables: `--color-bg-surface`, `--color-border`, `--color-shadow-heavy`, `--color-text-on-header`, etc.
+
+### Files Touched
+
+| File | Change |
+|------|--------|
+| `frontend/src/components/AdminDropdown.tsx` | **New** — dropdown component |
+| `frontend/src/App.tsx` | Remove ModeToggle import/usage, remove 3 admin links, add AdminDropdown |
+| `frontend/src/App.css` | Add `.admin-dropdown*` styles (~30 lines) |
+
+### Files NOT Touched
+
+| File | Why |
+|------|-----|
+| `frontend/src/components/ModeToggle.tsx` | Still used by ReviewQueue.tsx — do not delete |
+| `frontend/src/App.css` `.mode-toggle` styles | Still used by ReviewQueue page — do not remove |
+
+### CSS Variable Reuse
+
+All needed tokens already exist:
+- Trigger text: `--color-text-on-header` / `--color-text-on-header-hover`
+- Dropdown panel background: `--color-bg-surface`
+- Dropdown border: `--color-border`
+- Dropdown shadow: `--color-shadow-heavy`
+- Item hover: `--color-bg-surface-hover`
+- Item text: `--color-text-primary`
+
+### Verification
+
+- `cd frontend && npx tsc --noEmit` — zero TypeScript errors
+- `cd frontend && npx vite build` — production build succeeds
+- Visual: header shows Home, Topics, Creators, Admin. Clicking Admin reveals dropdown with Review, Reports, Pipeline links. No ModeToggle in header.
+- Navigation: each dropdown link navigates to the correct route
+- Click outside dropdown → closes
+- Escape key → closes
+- Mobile (640px): dropdown still accessible
+
+### Accessibility Notes
+
+- Dropdown trigger should use `<button>` with `aria-expanded` and `aria-haspopup="true"`
+- Dropdown menu should use `role="menu"` with `role="menuitem"` on links
+- Escape key should close the menu and return focus to trigger
+
+### Risk
+
+Low. No backend changes, no route changes, no new dependencies. The dropdown is a pure presentational addition to the existing nav.

.gsd/milestones/M006/slices/S01/tasks/T01-PLAN.md

@@ -0,0 +1,50 @@
+---
+estimated_steps: 22
+estimated_files: 3
+skills_used: []
+---
+
+# T01: Create AdminDropdown component, wire into header, add styles
+
+Create an AdminDropdown React component, replace the 3 admin nav links and ModeToggle in App.tsx, and add dropdown CSS to App.css.
+
+**Context:** The header in `App.tsx` currently has 6 flat `<Link>` elements (Home, Topics, Creators, Review, Reports, Pipeline) plus a `<ModeToggle />`. Goal: group the 3 admin links behind an "Admin" dropdown, remove ModeToggle from the header. ModeToggle is still used by `ReviewQueue.tsx` — do NOT delete the component or its CSS.
+
+**Click-outside pattern** — adapt from `Home.tsx` (typeahead):
+```tsx
+const dropdownRef = useRef<HTMLDivElement>(null);
+useEffect(() => {
+  function handler(e: MouseEvent) {
+    if (dropdownRef.current && !dropdownRef.current.contains(e.target as Node)) {
+      setOpen(false);
+    }
+  }
+  document.addEventListener("mousedown", handler);
+  return () => document.removeEventListener("mousedown", handler);
+}, []);
+```
+
+**CSS variables available** (all defined in App.css `:root`):
+- Trigger text: `--color-text-on-header` / `--color-text-on-header-hover`
+- Dropdown background: `--color-bg-surface`
+- Border: `--color-border`
+- Shadow: `--color-shadow-heavy`
+- Item hover bg: `--color-bg-surface-hover`
+- Item text: `--color-text-primary`
+
+## Inputs
+
+- ``frontend/src/App.tsx` — current header with 6 flat nav links + ModeToggle import to refactor`
+- ``frontend/src/App.css` — existing header/nav styles and CSS custom properties (lines 146-175 for header, line 6+ for variables)`
+- ``frontend/src/components/ModeToggle.tsx` — must NOT be deleted (still imported by ReviewQueue.tsx line 16)`
+- ``frontend/src/pages/Home.tsx` — click-outside dropdown pattern (useRef + mousedown event listener) to adapt`
+
+## Expected Output
+
+- ``frontend/src/components/AdminDropdown.tsx` — new component: useState toggle, useRef click-outside, Escape key handler, `<button>` trigger with aria-expanded + aria-haspopup='true', dropdown `<div role='menu'>` with 3 `<Link role='menuitem'>` items (Review → /admin/review, Reports → /admin/reports, Pipeline → /admin/pipeline), close on link click`
+- ``frontend/src/App.tsx` — ModeToggle import line removed, `<ModeToggle />` JSX removed, AdminDropdown imported, 3 admin `<Link>` elements replaced with `<AdminDropdown />`; remaining nav: Home, Topics, Creators as flat links`
+- ``frontend/src/App.css` — new styles appended: `.admin-dropdown` (position: relative), `.admin-dropdown__trigger` (styled like nav links — same font-size, color, background:none, border:none, cursor:pointer, uses --color-text-on-header), `.admin-dropdown__menu` (position: absolute, top: 100%, right: 0, min-width: 10rem, background: var(--color-bg-surface), border: 1px solid var(--color-border), border-radius: 0.5rem, box-shadow, z-index: 100), `.admin-dropdown__item` (display: block, padding, color: var(--color-text-primary), hover: var(--color-bg-surface-hover))`
+
+## Verification
+
+cd frontend && npx tsc --noEmit && npx vite build

.gsd/milestones/M006/slices/S01/tasks/T01-SUMMARY.md

@@ -0,0 +1,80 @@
+---
+id: T01
+parent: S01
+milestone: M006
+provides: []
+requires: []
+affects: []
+key_files: ["frontend/src/components/AdminDropdown.tsx", "frontend/src/App.tsx", "frontend/src/App.css"]
+key_decisions: ["Used calc(100% + 0.5rem) for menu offset to add visual breathing room", "BEM naming convention: admin-dropdown / admin-dropdown__trigger / __menu / __item"]
+patterns_established: []
+drill_down_paths: []
+observability_surfaces: []
+duration: ""
+verification_result: "TypeScript check (tsc --noEmit) passed with zero errors. Vite production build succeeded — 47 modules transformed, built in 778ms. Both slice-level verification commands pass."
+completed_at: 2026-03-30T11:02:14.843Z
+blocker_discovered: false
+---
+
+# T01: Created AdminDropdown component with click-outside/Escape close, wired into App.tsx header replacing 3 admin links + ModeToggle, added dropdown CSS using existing theme tokens
+
+> Created AdminDropdown component with click-outside/Escape close, wired into App.tsx header replacing 3 admin links + ModeToggle, added dropdown CSS using existing theme tokens
+
+## What Happened
+---
+id: T01
+parent: S01
+milestone: M006
+key_files:
+  - frontend/src/components/AdminDropdown.tsx
+  - frontend/src/App.tsx
+  - frontend/src/App.css
+key_decisions:
+  - Used calc(100% + 0.5rem) for menu offset to add visual breathing room
+  - BEM naming convention: admin-dropdown / admin-dropdown__trigger / __menu / __item
+duration: ""
+verification_result: passed
+completed_at: 2026-03-30T11:02:14.844Z
+blocker_discovered: false
+---
+
+# T01: Created AdminDropdown component with click-outside/Escape close, wired into App.tsx header replacing 3 admin links + ModeToggle, added dropdown CSS using existing theme tokens
+
+**Created AdminDropdown component with click-outside/Escape close, wired into App.tsx header replacing 3 admin links + ModeToggle, added dropdown CSS using existing theme tokens**
+
+## What Happened
+
+Created AdminDropdown.tsx with useState toggle, useRef click-outside listener, Escape handler, accessible button trigger (aria-expanded, aria-haspopup), and role=menu div with 3 Link menuitem elements. Updated App.tsx to import AdminDropdown instead of ModeToggle, replaced 3 admin Link elements and ModeToggle JSX with single AdminDropdown component. Appended BEM-style dropdown CSS to App.css using existing theme custom properties. ModeToggle preserved — still imported by ReviewQueue.tsx.
+
+## Verification
+
+TypeScript check (tsc --noEmit) passed with zero errors. Vite production build succeeded — 47 modules transformed, built in 778ms. Both slice-level verification commands pass.
+
+## Verification Evidence
+
+| # | Command | Exit Code | Verdict | Duration |
+|---|---------|-----------|---------|----------|
+| 1 | `cd frontend && npx tsc --noEmit` | 0 | ✅ pass | 3000ms |
+| 2 | `cd frontend && npx vite build` | 0 | ✅ pass | 4400ms |
+
+
+## Deviations
+
+None.
+
+## Known Issues
+
+None.
+
+## Files Created/Modified
+
+- `frontend/src/components/AdminDropdown.tsx`
+- `frontend/src/App.tsx`
+- `frontend/src/App.css`
+
+
+## Deviations
+None.
+
+## Known Issues
+None.

.gsd/milestones/M006/slices/S02/S02-PLAN.md

@@ -0,0 +1,6 @@
+# S02: Pipeline Page: Head/Tail Log View + Token Count
+
+**Goal:** Add head/tail viewing to pipeline event log for quick start/end inspection
+**Demo:** After this: Pipeline event log shows Head/Tail toggle buttons. Head shows first N events, Tail shows last N events. Token counts visible per event and per video.
+
+## Tasks

.gsd/milestones/M006/slices/S03/S03-PLAN.md

@@ -0,0 +1,6 @@
+# S03: Git Commit SHA in Pipeline Version Metadata
+
+**Goal:** Record git commit SHA in pipeline metadata for traceability of prompt/code state at synthesis time
+**Demo:** After this: Running the pipeline captures the current git commit SHA. Viewing a technique page version shows the commit hash in the metadata panel.
+
+## Tasks

.gsd/milestones/M006/slices/S04/S04-PLAN.md

@@ -0,0 +1,6 @@
+# S04: Technique Page: Sidebar Reorder, Creator Emphasis, Tag Polish
+
+**Goal:** Improve technique page visual hierarchy: plugins first in sidebar, creator stands out, tags make sense
+**Demo:** After this: Technique page sidebar shows Plugins Referenced at top. Creator name is visually prominent. Tags use a coherent color system.
+
+## Tasks

.gsd/milestones/M006/slices/S05/S05-PLAN.md

@@ -0,0 +1,6 @@
+# S05: Topics Page Redesign + Music Theory Category
+
+**Goal:** Add Music Theory to the taxonomy, update classification prompt, and redesign the Topics browse page
+**Demo:** After this: Topics page shows 7 categories (including Music Theory) with an improved visual layout — category cards with descriptions, sub-topic counts, better structure.
+
+## Tasks

.gsd/milestones/M006/slices/S06/S06-PLAN.md

@@ -0,0 +1,6 @@
+# S06: App Footer with Version Info
+
+**Goal:** Add application versioning via a persistent footer
+**Demo:** After this: Every page shows a subtle footer with app version, build date, and optional repo link.
+
+## Tasks

frontend/src/App.css

@@ -776,6 +776,53 @@ body {
   color: var(--color-text-on-header-hover);
 }
 
+/* ── Admin dropdown ───────────────────────────────────────────────────────── */
+
+.admin-dropdown {
+  position: relative;
+}
+
+.admin-dropdown__trigger {
+  font-family: inherit;
+  font-size: 0.875rem;
+  color: var(--color-text-on-header);
+  background: none;
+  border: none;
+  cursor: pointer;
+  padding: 0;
+  transition: color 0.15s;
+}
+
+.admin-dropdown__trigger:hover {
+  color: var(--color-text-on-header-hover);
+}
+
+.admin-dropdown__menu {
+  position: absolute;
+  top: calc(100% + 0.5rem);
+  right: 0;
+  min-width: 10rem;
+  background: var(--color-bg-surface);
+  border: 1px solid var(--color-border);
+  border-radius: 0.5rem;
+  box-shadow: 0 4px 16px var(--color-shadow-heavy);
+  z-index: 100;
+  padding: 0.375rem 0;
+}
+
+.admin-dropdown__item {
+  display: block;
+  padding: 0.5rem 1rem;
+  color: var(--color-text-primary);
+  text-decoration: none;
+  font-size: 0.875rem;
+  transition: background 0.12s;
+}
+
+.admin-dropdown__item:hover {
+  background: var(--color-bg-surface-hover);
+}
+
 /* ── Home / Hero ──────────────────────────────────────────────────────────── */
 
 .home-hero {

frontend/src/App.tsx

@@ -9,7 +9,7 @@ import ReviewQueue from "./pages/ReviewQueue";
 import MomentDetail from "./pages/MomentDetail";
 import AdminReports from "./pages/AdminReports";
 import AdminPipeline from "./pages/AdminPipeline";
-import ModeToggle from "./components/ModeToggle";
+import AdminDropdown from "./components/AdminDropdown";
 
 export default function App() {
   return (
@@ -23,11 +23,8 @@ export default function App() {
             <Link to="/">Home</Link>
             <Link to="/topics">Topics</Link>
             <Link to="/creators">Creators</Link>
-            <Link to="/admin/review">Review</Link>
+            <AdminDropdown />
-            <Link to="/admin/reports">Reports</Link>
-            <Link to="/admin/pipeline">Pipeline</Link>
           </nav>
-          <ModeToggle />
         </div>
       </header>
 

frontend/src/components/AdminDropdown.tsx

@@ -0,0 +1,73 @@
+import { useEffect, useRef, useState } from "react";
+import { Link } from "react-router-dom";
+
+export default function AdminDropdown() {
+  const [open, setOpen] = useState(false);
+  const dropdownRef = useRef<HTMLDivElement>(null);
+
+  // Close on outside click
+  useEffect(() => {
+    function handler(e: MouseEvent) {
+      if (
+        dropdownRef.current &&
+        !dropdownRef.current.contains(e.target as Node)
+      ) {
+        setOpen(false);
+      }
+    }
+    document.addEventListener("mousedown", handler);
+    return () => document.removeEventListener("mousedown", handler);
+  }, []);
+
+  // Close on Escape
+  useEffect(() => {
+    function handler(e: KeyboardEvent) {
+      if (e.key === "Escape") setOpen(false);
+    }
+    if (open) {
+      document.addEventListener("keydown", handler);
+      return () => document.removeEventListener("keydown", handler);
+    }
+  }, [open]);
+
+  return (
+    <div className="admin-dropdown" ref={dropdownRef}>
+      <button
+        className="admin-dropdown__trigger"
+        onClick={() => setOpen((prev) => !prev)}
+        aria-expanded={open}
+        aria-haspopup="true"
+      >
+        Admin ▾
+      </button>
+      {open && (
+        <div className="admin-dropdown__menu" role="menu">
+          <Link
+            to="/admin/review"
+            className="admin-dropdown__item"
+            role="menuitem"
+            onClick={() => setOpen(false)}
+          >
+            Review
+          </Link>
+          <Link
+            to="/admin/reports"
+            className="admin-dropdown__item"
+            role="menuitem"
+            onClick={() => setOpen(false)}
+          >
+            Reports
+          </Link>
+          <Link
+            to="/admin/pipeline"
+            className="admin-dropdown__item"
+            role="menuitem"
+            onClick={() => setOpen(false)}
+          >
+            Pipeline
+          </Link>
+        </div>
+      )}
+    </div>
+  );
+}