# ResolutionFlow UI Design System & Layout Architecture

> **Purpose:** This document defines the new app-shell layout, design tokens, component patterns, and workspace architecture for ResolutionFlow. It is the single source of truth for all frontend UI work going forward.
> **Last Updated:** February 15, 2026
> **Status:** Approved for implementation
> **Reference Mockup:** `docs/mockups/resolutionflow-workspaces-mockup.html` (interactive, open in browser)
> **Note:** If the mockup file is not yet in the repo, it should be placed at the path above. The mockup is also available as a project output artifact.

---

## Table of Contents

1. [Layout Architecture](#1-layout-architecture)
2. [Design Tokens](#2-design-tokens)
3. [Workspace System](#3-workspace-system)
4. [Sidebar Components](#4-sidebar-components)
5. [Top Bar](#5-top-bar)
6. [Main Content Area](#6-main-content-area)
7. [Component Patterns](#7-component-patterns)
8. [Icon System](#8-icon-system)
9. [Animation & Transitions](#9-animation--transitions)
10. [Data Model Changes](#10-data-model-changes)
11. [Migration Strategy](#11-migration-strategy)
12. [Implementation Phases](#12-implementation-phases)

---

## 1. Layout Architecture

### Overview

ResolutionFlow transitions from a top-nav + full-width content layout to a **persistent sidebar + top bar + main workspace** layout. This mirrors the UX patterns MSP engineers already use in ConnectWise Automate, Datto RMM, and HaloPSA.

### Shell Structure

```
┌──────────────────────────────────────────────────────┐
│  TOP BAR (56px) — Logo, Search, Quick Actions, User  │
├──────────────┬───────────────────────────────────────┤
│  SIDEBAR     │  MAIN CONTENT AREA                    │
│  (260px)     │                                       │
│              │  Page Header + Actions                │
│  Workspace   │  Quick Stats Row                      │
│  Switcher    │  Filters Bar                          │
│              │  Content Sections                     │
│  Navigation  │  (trees/flows list, sessions, etc.)   │
│              │                                       │
│  Categories  │                                       │
│  Tags        │                                       │
│              │                                       │
│  ─────────── │                                       │
│  Team        │                                       │
│  Settings    │                                       │
└──────────────┴───────────────────────────────────────┘
```

### CSS Grid Implementation

```tsx
// AppLayout.tsx - new shell structure
<div className="app-shell">
  <header className="topbar">...</header>
  <nav className="sidebar">...</nav>
  <main className="main-content">
    <Outlet />
  </main>
</div>
```

```css
.app-shell {
  display: grid;
  grid-template-columns: 260px 1fr;
  grid-template-rows: 56px 1fr;
  height: 100vh;
  overflow: hidden;
}

.topbar {
  grid-column: 1 / -1; /* spans full width */
}

.sidebar {
  overflow-y: auto;
}

.main-content {
  overflow-y: auto;
}
```

### CSS Variable for Sidebar Width

```css
:root {
  --sidebar-w: 260px;
}
```

This variable should be used consistently for sidebar width, logo area width calculations, and responsive breakpoints.

---

## 2. Design Tokens

### Existing Tokens (Already in tailwind.config.js and index.css)

These are already implemented and MUST be used. Do NOT introduce new color values that duplicate or conflict with these.

#### Brand Colors (from tailwind.config.js)

| Token | Value | Usage |
|-------|-------|-------|
| `brand.gradient.from` | `#818cf8` | Gradient start, primary accent |
| `brand.gradient.to` | `#a78bfa` | Gradient end |
| `brand.dark.DEFAULT` | `#09090b` | App background (dark mode) |
| `brand.dark.card` | `#18181b` | Card backgrounds |
| `brand.dark.surface` | `#12121c` | Elevated surface |
| `brand.text.primary` | `#ffffff` | Primary text |
| `brand.text.secondary` | `#a1a1aa` | Secondary text |
| `brand.text.muted` | `#52525b` | Muted/dim text |
| `brand.border` | `#27272a` | Standard borders |

#### Tailwind Utilities (from index.css)

| Utility | Description |
|---------|-------------|
| `bg-gradient-brand` | `linear-gradient(90deg, #818cf8, #a78bfa)` |
| `bg-gradient-brand-hover` | `linear-gradient(90deg, #6366f1, #9333ea)` |
| `text-gradient-brand` | Gradient text effect (uses bg-clip-text) |
| `font-heading` | Plus Jakarta Sans |
| `font-sans` | Inter |
| `font-label` | Outfit |

#### shadcn/ui CSS Variables (from index.css)

All shadcn component tokens are defined via HSL CSS variables (`--background`, `--foreground`, `--card`, `--primary`, etc.) with both light and dark mode values. Continue using these for shadcn components.

### NEW Design Tokens for App Shell

These are already added to `index.css` within the `:root` block (the app is dark-only, all tokens live in `:root`):

```css
:root {
  /* Existing tokens... */

  /* App Shell tokens */
  --sidebar-bg: 240 10% 4.5%;          /* #0c0c0f - slightly lighter than app bg */
  --sidebar-hover: 240 6% 12%;          /* #1e1e23 */
  --sidebar-active: 243 75% 59% / 0.08; /* brand purple at 8% opacity */
  --border-subtle: 240 6% 12%;          /* #1f1f23 - lighter border for sections */
  --text-dimmed: 240 4% 24%;            /* #3f3f46 - very dim text for timestamps */
}
```

### Semantic Status Colors

These map to session/tree status indicators and MUST be used consistently:

| Status | Color | Tailwind Class | Usage |
|--------|-------|---------------|-------|
| Success / Resolved | `#22c55e` | `text-green-500` / `bg-green-500` | Completed sessions, resolved |
| Warning / In Progress | `#f59e0b` | `text-amber-500` / `bg-amber-500` | Open/active sessions |
| Error / Critical | `#ef4444` | `text-red-500` / `bg-red-500` | Failed, critical priority |
| Info | `#3b82f6` | `text-blue-500` / `bg-blue-500` | Informational, default |

### Category Colors

Categories use a fixed palette of distinguishable colors for their dot indicators:

```typescript
// constants/categoryColors.ts
export const CATEGORY_COLORS = [
  '#3b82f6', // blue
  '#22c55e', // green
  '#f59e0b', // amber
  '#ef4444', // red
  '#8b5cf6', // violet
  '#06b6d4', // cyan
  '#ec4899', // pink
  '#f97316', // orange
  '#14b8a6', // teal
  '#6366f1', // indigo
] as const;
```

Categories are assigned colors based on their creation order (index % length). Colors are stored on the category model in the database.

> **Migration needed:** The `tree_categories` table already has `display_order` and `is_active` columns. Add a `color` column:
> ```sql
> ALTER TABLE tree_categories ADD COLUMN color VARCHAR(7) DEFAULT '#3b82f6';
> ```
> Backfill existing categories with colors from the palette based on their `display_order`.

---

## 3. Workspace System

### Concept

Workspaces are the top-level organizational context. They sit **above** the existing folder system — a workspace scopes which trees/flows are visible, while user folders remain available within each workspace for personal organization. When a user switches workspace, the sidebar categories, tags, stats, filters, and main content all adapt.

> **Important:** Workspaces do NOT replace the existing `UserFolder` system. Folders are per-user personal organization that continue to work within the active workspace context. The folder sidebar, drag-and-drop, and folder-tree junction table are preserved. Workspaces filter what content is available; folders organize it.

The layout, navigation structure, and component patterns stay identical — only the DATA changes.

### Workspace Types (Initial Set)

| Workspace | Description | Icon | Accent Color |
|-----------|-------------|------|-------------|
| Troubleshooting | Break/fix decision trees | 🔧 | `#ef4444` (red) |
| Procedures | Step-by-step operational flows | 📋 | `#3b82f6` (blue) |
| Policies | Compliance & policy builders | 📜 | `#8b5cf6` (violet) |
| Finance | Billing & procurement flows | 💰 | `#22c55e` (green) |

**Users and admins can create custom workspaces.** The four above are defaults.

### Workspace Switcher Component

Located at the top of the sidebar, below the nav section label. It's a dropdown that shows:

1. **Current workspace** — icon, name, description, chevron
2. **Dropdown options** — all available workspaces with flow counts
3. **"Add workspace…"** — link at bottom to create new

```
┌─────────────────────────────┐
│ 🔧  Troubleshooting         │
│     Break/fix decision trees │
│                           ▼  │
├─────────────────────────────┤
│ 🔧 Troubleshooting    42   │ ← active (highlighted)
│ 📋 Procedures          18   │
│ 📜 Policies             7   │
│ 💰 Finance              4   │
│─────────────────────────────│
│ + Add workspace…            │
└─────────────────────────────┘
```

### Behavior on Workspace Switch

When the user selects a new workspace:

1. Sidebar content fades out (200ms opacity transition)
2. Data updates:
   - Categories list → filtered to workspace
   - Tags cloud → filtered to workspace
   - Nav badge counts → reflect workspace totals
   - "All Trees" label → changes (e.g., "All Procedures")
   - "Tree Editor" label → changes (e.g., "Flow Editor")
   - Search placeholder → adapts
3. Main content fades out/in (200ms opacity transition)
   - Page title changes
   - Stats row updates
   - Filter chips update
   - Tree/flow list filters to workspace
   - Sessions panel filters to workspace
4. "New Tree" button label → adapts (e.g., "New Procedure")
5. Toast notification confirms switch: "Switched to **Procedures**"

### Data Model

See [Section 10: Data Model Changes](#10-data-model-changes) for backend schema.

---

## 4. Sidebar Components

### Structure (top to bottom)

```
1. Workspace Switcher (dropdown)
2. ─── divider ───
3. Primary Navigation
   - Dashboard (grid icon)
   - All Trees/Flows (cube icon) [badge: count]
   - Tree/Flow Editor (pencil icon)
   - Sessions (clock icon) [badge: active count]
   - Exports (file icon)
   - Step Library (bookmark icon) [dot: new items]
4. ─── divider ───
5. Categories Section
   - Section label: "CATEGORIES"
   - Category items with color dots and counts
6. ─── divider ───
7. Tags Section
   - Section label: "POPULAR TAGS"
   - Tag chips in a flex-wrap cloud
8. ─── spacer (flex-grow) ───
9. Footer (pinned to bottom)
   - Team (users icon)
   - Settings (gear icon)
```

### Nav Item Component

```tsx
interface NavItemProps {
  href: string;
  icon: LucideIcon;
  label: string;
  badge?: number | 'dot';
  isActive?: boolean;
}
```

**Active state styling:**
- Background: `var(--sidebar-active)` (brand purple at 8% opacity)
- Left border accent: 3px gradient bar (brand gradient, rounded right corners)
- Text: `text-foreground` (white in dark mode)
- Icon: full opacity

**Inactive state styling:**
- Background: transparent
- Text: `text-muted-foreground`
- Icon: 70% opacity
- Hover: `var(--sidebar-hover)` background

### Category Item Component

```tsx
interface CategoryItemProps {
  name: string;
  color: string;  // hex color for the dot
  count: number;
  onClick: () => void;
}
```

Renders as: `[●] Category Name .............. 12`

- 8px color dot (rounded full)
- Name in `text-sm text-muted-foreground`
- Count right-aligned in `font-label text-xs` (Outfit font)
- Hover: `var(--sidebar-hover)` background, text brightens

### Tag Cloud Component

```tsx
interface TagCloudProps {
  tags: string[];
  onTagClick: (tag: string) => void;
  activeTags?: string[];
}
```

Renders as flex-wrap container of small chip elements:
- Background: `bg-card`
- Border: `border-border`
- Text: `font-label text-xs` (Outfit)
- Active: purple-tinted background and border
- Gap: 4px

---

## 5. Top Bar

### Structure (left to right)

```
[Logo + Wordmark] | [Search Input (⌘K)] | ──flex grow── | [Quick Launch] [Notifications] [Avatar]
```

### Logo Area

- Width: `calc(var(--sidebar-w) - 40px)` — aligns with sidebar content
- Contains: ResolutionFlow logo SVG (32x32) + branded wordmark
- Wordmark: "Resolution" in white + "Flow" in gradient text

### Search Bar

- Flex: 1, max-width 480px
- Placeholder adapts to workspace context (e.g., "Search trees, sessions, tags…")
- Left icon: magnifying glass (Lucide `Search`)
- Right badge: keyboard shortcut hint `⌘K` (styled as small pill)
- Border: `border-border`, focus: `border-brand-gradient-from`

### Action Buttons

| Button | Icon | Behavior |
|--------|------|----------|
| Quick Launch | `Zap` (Lucide) | Opens quick-launch modal to start a session fast |
| Notifications | `Bell` (Lucide) | Opens notification panel. Red dot badge when unread |
| User Avatar | Initials circle | Opens user menu dropdown (profile, settings, logout) |

Avatar: 32px circle with brand gradient background, white initials in `font-heading text-xs font-bold`.

---

## 6. Main Content Area

### Page Structure

Every page in the main content follows this vertical flow:

```
1. Page Header (title + action buttons)
2. Quick Stats Row (4 cards)
3. Filters Bar (chips)
4. Content Sections (grouped lists, panels)
```

Not every page needs all sections. The Dashboard uses all four. The Tree Editor page would only use the page header and then the editor workspace.

### Quick Stats Row

4 stat cards in a CSS grid (`grid-template-columns: repeat(4, 1fr)`).

Each card:
- Background: `bg-card`
- Border: `border` (subtle, brightens on hover)
- Border radius: `rounded-xl` (10px)
- Padding: 16px 18px
- Label: `font-label text-[0.6875rem] uppercase tracking-wide text-muted-foreground`
- Value: `font-heading text-2xl font-bold`
- Meta: `text-[0.6875rem] text-[var(--text-dimmed)]`

Special value styles:
- `.gradient` → `text-gradient-brand`
- Colored → direct color style (e.g., amber for warnings)

### Filters Bar

Horizontal row of filter chips with a divider before "More Filters":

```
[All*] [Recently Used] [My Trees] [Team Trees] [Defaults] | [⊗ More Filters]
```

Active chip: purple-tinted background/border (same as sidebar tag active state).

### Section Groups

Collapsible sections with header:

```
[●] SECTION TITLE    5    [▼]
─────────────────────────────
```

- Dot: 8px gradient circle
- Title: `font-heading text-[0.8125rem] font-bold uppercase tracking-wide`
- Count: pill with `bg-surface` background
- Collapse: chevron button (toggles section visibility)

### Tree/Flow List Items

Grid layout per item:

```
grid-template-columns: 40px 1fr 130px 80px 100px 40px
                       icon  info category uses updated actions
```

Each item:
- Background: `bg-card`, transparent border
- Hover: `border-border`, `bg-[var(--sidebar-hover)]`
- Border radius: `rounded-lg`
- Padding: 12px 16px

**Icon box:** 36x36px rounded-lg with category-tinted background and emoji.

**Info column:**
- Name: `font-heading text-sm font-semibold`
- Meta row: tags (small chips) + step/solution count

**Category column:** color dot + name in `font-label text-xs`

**Actions:** Three-dot menu, opacity 0 until row hover.

### Sessions Panel

Contained card with header and rows:

```
┌ Recent Sessions ──────── [View All] ┐
│ ● DNS Resolution Failure  → step 4/12  TKT-4821  12 min ago │
│ ● Account Lockout         → step 6/18  TKT-4819  45 min ago │
│ ✓ Mail Flow               ✓ Resolved   TKT-4815  Yesterday  │
└──────────────────────────────────────┘
```

Session row grid:
```
grid-template-columns: 8px 1fr 140px 80px 100px
                       dot  name progress ticket time
```

Status dot colors: `bg-amber-500` (in-progress), `bg-green-500` (completed).

---

## 7. Component Patterns

### Buttons

| Variant | Background | Text | Shadow | Hover |
|---------|-----------|------|--------|-------|
| Primary | `bg-gradient-brand` | white | `shadow-lg shadow-primary/20` | Lift + stronger shadow |
| Secondary | `bg-card` | `text-muted-foreground` | border only | Border brightens |

Both: `rounded-lg px-4 py-2 text-sm font-semibold`, with icon support (16px Lucide icon + 6px gap).

### Badges

- **Count badge:** `bg-card border border-border rounded-full px-2 text-[0.6875rem] font-label`
- **Active count badge:** purple-tinted background/border
- **Dot badge:** 6px circle, `bg-brand-gradient-from`
- **Notification badge:** 8px red circle with sidebar-bg border (creates "cut out" effect)

### Toast Notifications

Fixed-position toast notification (current app uses top-right via Sonner — keep this position for consistency):
- Background: `bg-card`
- Border: brand gradient border
- Border radius: `rounded-xl`
- Shadow: `shadow-xl` with heavy dark shadow
- Content: emoji icon + message text (supports `<strong>` for emphasis)
- Auto-dismiss: 2000ms with fade out

---

## 8. Icon System

### Primary Source: Lucide React

All icons use [Lucide React](https://lucide.dev) at consistent sizes:

| Context | Size | Lucide Prop |
|---------|------|-------------|
| Nav items | 18px | `size={18}` |
| Buttons | 16px | `size={16}` |
| Top bar actions | 18px | `size={18}` |
| Section headers | 14px | `size={14}` |
| Filter chips | 14px | `size={14}` |

### Navigation Icon Mapping

| Nav Item | Lucide Icon |
|----------|-------------|
| Dashboard | `LayoutGrid` |
| All Trees/Flows | `Box` |
| Tree/Flow Editor | `PenLine` |
| Sessions | `Clock` |
| Exports | `FileText` |
| Step Library | `Bookmark` |
| Team | `Users` |
| Settings | `Settings` |
| Search | `Search` |
| Quick Launch | `Zap` |
| Notifications | `Bell` |
| New Tree | `Plus` |
| Import | `Upload` |
| Filter | `Filter` |
| Collapse | `ChevronDown` |
| More Actions | `MoreHorizontal` |

### Category Emoji Icons

Categories in the tree list use emoji as visual anchors inside tinted icon boxes. These are set per-tree or per-category and stored as a string field.

Default emoji per common categories:
- Networking: 🌐
- Active Directory: 🔒
- Email/Exchange: 📧
- Server Issues: 🖥️
- VPN/Remote: 🔌
- Citrix/RDS: 🖥️
- Printers: 🖨️
- Backup/DR: 🔄
- Onboarding: 👤
- Security: 🔐

---

## 9. Animation & Transitions

### Page/Section Load

Staggered fade-in using CSS animation:

```css
.fade-in {
  animation: fadeIn 0.3s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
```

Apply with incrementing `animation-delay` on child sections:
- Stats row: 50ms
- Filters: 100ms
- Section 1: 150ms
- Section 2: 200ms

### Workspace Switch

Coordinated fade transition:
1. Sidebar content: `opacity → 0` (200ms)
2. Main content: `opacity → 0` (200ms)
3. Data swap (instant)
4. Both: `opacity → 1` (200ms)

### Interactive Elements

| Element | Property | Duration | Easing |
|---------|----------|----------|--------|
| Nav item hover | background-color | 120ms | ease |
| Button hover | transform, box-shadow | 150ms | ease |
| Tree item hover | background, border-color | 120ms | ease |
| Dropdown open | opacity, transform | 150ms | ease |
| Action buttons (three-dot) | opacity | 120ms | ease |
| Toast appear/disappear | opacity, transform | 300ms | ease |

### Workspace Dropdown

```css
@keyframes dropIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}
```

---

## 10. Data Model Changes

### New: `workspaces` Table

```sql
CREATE TABLE workspaces (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name VARCHAR(100) NOT NULL,
    slug VARCHAR(100) NOT NULL UNIQUE,
    description TEXT,
    icon VARCHAR(10),           -- emoji character
    accent_color VARCHAR(7),    -- hex color (e.g., '#ef4444')
    account_id UUID REFERENCES accounts(id) ON DELETE CASCADE,
    is_default BOOLEAN DEFAULT FALSE,
    sort_order INTEGER DEFAULT 0,
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW()
);
```

**Default workspaces (seeded):**

| name | slug | icon | accent_color | is_default |
|------|------|------|-------------|------------|
| Troubleshooting | troubleshooting | 🔧 | #ef4444 | true |
| Procedures | procedures | 📋 | #3b82f6 | false |
| Policies | policies | 📜 | #8b5cf6 | false |
| Finance | finance | 💰 | #22c55e | false |

### Modified: `trees` Table

Add column:

```sql
ALTER TABLE trees ADD COLUMN workspace_id UUID REFERENCES workspaces(id);
```

All existing trees get assigned to the "troubleshooting" workspace via data migration.

> **Note:** The `trees` table already has a `tree_type` column with values `'troubleshooting'` and `'procedural'`. The workspace system is a superset of this — `tree_type` controls tree behavior (branching vs linear), while `workspace_id` controls organizational context. Both fields coexist. The data migration should map existing `tree_type='troubleshooting'` trees to the Troubleshooting workspace and `tree_type='procedural'` trees to the Procedures workspace.

### Modified: `tree_categories` Table

Add column:

```sql
ALTER TABLE tree_categories ADD COLUMN workspace_id UUID REFERENCES workspaces(id);
```

Categories become workspace-scoped. A category belongs to one workspace. The existing `account_id` column remains for tenancy — `workspace_id` is an additional organizational dimension within an account.

### Modified: `tree_tags` Table

Tags remain global (cross-workspace) but the popular tags query filters by workspace context. The existing `account_id` scoping on tags is preserved.

### API Changes

**New endpoints:**

```
GET    /api/v1/workspaces              -- list all workspaces for user's account
POST   /api/v1/workspaces              -- create workspace (admin)
PATCH  /api/v1/workspaces/{id}         -- update workspace
DELETE /api/v1/workspaces/{id}         -- soft delete workspace
```

**Modified endpoints:**

```
GET /api/v1/trees?workspace_id={uuid}       -- add workspace filter
GET /api/v1/categories?workspace_id={uuid}   -- categories are a separate router (categories.py)
GET /api/v1/sessions?workspace_id={uuid}
```

> **Note:** Categories have their own dedicated router at `/api/v1/categories` (not nested under `/trees/categories`). Tags are at `/api/v1/tags`. Folders are at `/api/v1/folders`. See `backend/app/api/router.py` for the full route registry.

### Frontend State

```typescript
// store/workspaceStore.ts
interface WorkspaceState {
  workspaces: Workspace[];
  activeWorkspaceId: string | null;
  setActiveWorkspace: (id: string) => void;
  // Persisted in localStorage as 'active-workspace-id'
}
```

All tree/session/category queries include the active workspace ID as a filter parameter.

---

## 11. Migration Strategy

### From Current Layout to App Shell

The current `AppLayout.tsx` uses a top-nav bar with horizontal nav links and an `<Outlet>` for full-width page content. The migration:

1. **AppLayout.tsx** → Complete rewrite to CSS Grid shell (topbar + sidebar + main)
2. **BrandLogo + BrandWordmark** → Move into topbar logo area
3. **Nav links** → Move into sidebar as vertical nav items with icons
4. **ThemeToggle** → Move into sidebar footer or top bar
5. **User menu** → Avatar in top bar with dropdown
6. **Outlet** → Renders inside `<main>` grid cell

### Page-by-Page Adaptation

| Page | Changes Needed |
|------|---------------|
| TreeLibraryPage | Becomes the "Dashboard" or "All Trees" view in main content area. Add stats row, filters, and grouped list layout |
| TreeNavigationPage | Renders in main content. Scratchpad overlay unchanged (fixed position) |
| TreeEditorPage | Renders in main content. Full-width editor workspace |
| SessionHistoryPage | Renders in main content. Add filters and session list |
| SessionDetailPage | Renders in main content. Minimal changes |
| SettingsPage | Renders in main content. Minimal changes |
| LoginPage / RegisterPage | **No change** — these render outside the app shell (no sidebar) |

---

## 12. Implementation Phases

### Phase A: Foundation (Backend + Shell)

1. Create `workspace` table, model, schemas, migration
2. Add `workspace_id` to `tree` and `tree_category` tables
3. Seed default workspaces
4. Data migration: assign all existing trees to "troubleshooting" workspace
5. Create workspace API endpoints
6. Create `workspaceStore` (Zustand + localStorage)
7. **Rewrite `AppLayout.tsx`** to CSS Grid shell with topbar + sidebar + main
8. Move existing nav items into sidebar
9. Add workspace switcher component (static, no data yet)

### Phase B: Sidebar Components

1. Build `NavItem` component with active state + badge
2. Build `CategoryList` component with color dots
3. Build `TagCloud` component
4. Build `WorkspaceSwitcher` dropdown with animations
5. Wire workspace switcher to `workspaceStore`
6. Update tree/session queries to include workspace filter

### Phase C: Main Content Redesign

1. Build `QuickStats` row component
2. Build `FiltersBar` component
3. Build `SectionGroup` collapsible component
4. Build `TreeListItem` component (grid layout)
5. Build `SessionsPanel` component
6. Redesign `TreeLibraryPage` as Dashboard using new components
7. Add search bar with ⌘K shortcut

### Phase D: Polish & Integration

1. Add workspace switch animations (fade transitions)
2. Add toast notifications for workspace switch
3. Responsive breakpoints (collapse sidebar on mobile)
4. Update all page components to work within new shell
5. E2E testing of workspace switching flow
6. Performance testing (workspace switch should be <200ms)

---

## Appendix A: File Structure for New Components

```
frontend/src/
├── components/
│   ├── layout/
│   │   ├── AppLayout.tsx          ← REWRITE (CSS Grid shell)
│   │   ├── TopBar.tsx             ← NEW
│   │   ├── Sidebar.tsx            ← NEW
│   │   ├── NavItem.tsx            ← NEW
│   │   └── ProtectedRoute.tsx     (unchanged)
│   ├── workspace/
│   │   ├── WorkspaceSwitcher.tsx   ← NEW
│   │   ├── CategoryList.tsx        ← NEW
│   │   └── TagCloud.tsx            ← NEW
│   ├── dashboard/
│   │   ├── QuickStats.tsx          ← NEW
│   │   ├── FiltersBar.tsx          ← NEW
│   │   ├── SectionGroup.tsx        ← NEW
│   │   ├── TreeListItem.tsx        ← NEW
│   │   └── SessionsPanel.tsx       ← NEW
│   └── common/
│       ├── Toast.tsx               ← NEW
│       └── ... (existing)
├── store/
│   ├── workspaceStore.ts           ← NEW
│   └── ... (existing)
├── api/
│   ├── workspaces.ts               ← NEW
│   └── ... (existing)
├── types/
│   ├── workspace.ts                ← NEW
│   └── ... (existing)
└── constants/
    └── categoryColors.ts           ← NEW
```

## Appendix B: Typography Quick Reference

| Element | Font | Weight | Size | Tracking |
|---------|------|--------|------|----------|
| Page titles | Plus Jakarta Sans (`font-heading`) | 700 | 1.375rem (22px) | -0.01em |
| Section titles | Plus Jakarta Sans | 700 | 0.8125rem (13px) | 0.04em, uppercase |
| Nav items | Inter (`font-sans`) | 500 | 0.8125rem (13px) | normal |
| Tree names | Plus Jakarta Sans | 600 | 0.875rem (14px) | -0.005em |
| Stat values | Plus Jakarta Sans | 700 | 1.5rem (24px) | -0.02em |
| Stat labels | Outfit (`font-label`) | 600 | 0.6875rem (11px) | 0.05em, uppercase |
| Badges/counts | Outfit | 400 | 0.6875rem (11px) | normal |
| Timestamps | Inter | 400 | 0.6875rem (11px) | normal |
| Tags/chips | Outfit | 400 | 0.625rem (10px) | normal |
| Search input | Inter | 400 | 0.8125rem (13px) | normal |

## Appendix C: Workspace-Specific Adaptations

When a workspace is active, these elements adapt:

| Element | Troubleshooting | Procedures | Policies | Finance |
|---------|----------------|------------|----------|---------|
| "All ___" nav label | All Trees | All Procedures | All Policies | All Finance Flows |
| Editor nav label | Tree Editor | Flow Editor | Policy Editor | Flow Editor |
| New button label | New Tree | New Procedure | New Policy | New Flow |
| Search placeholder | Search trees, sessions, tags… | Search procedures, runbooks… | Search policies, compliance… | Search billing, procurement… |
| Stat 1 label | Active Trees | Active Procedures | Active Policies | Active Flows |
| Stat 2 label | Sessions Today | Runs This Week | Pending Review | Runs This Month |
| Stat 3 label | Open Sessions | In Progress | Compliance Score | Cost Saved |
| Stat 4 label | Docs Generated | Avg Completion | Last Audit | Pending Approvals |