---
phase: 13-design-system-foundation
plan: "05"
subsystem: backend/internal/web/ui/catalog
tags: [catalog, build-tags, templ, htmx, tailwind, design-system, go]
dependency_graph:
  requires:
    - 13-03
    - 13-04
  provides:
    - catalog-package
    - ui-catalog-route
    - catalog-route-build-tag-pattern
    - catalog-justfile-target
  affects:
    - backend/internal/web/ui/catalog/catalog.templ
    - backend/internal/web/ui/catalog/examples.go
    - backend/internal/web/catalog_route_catalog.go
    - backend/internal/web/catalog_route_stub.go
    - backend/internal/web/router.go
    - backend/justfile
tech_stack:
  added: []
  patterns:
    - build-tag-gated-route (//go:build catalog + //go:build !catalog stub)
    - single-page-catalog-layout (sidebar nav + fluid main, Tailwind shell only)
    - modal-panel-only-rendering (no backdrop wrapper in catalog, Pitfall 7)
key_files:
  created:
    - backend/internal/web/ui/catalog/catalog.templ
    - backend/internal/web/ui/catalog/examples.go
    - backend/internal/web/catalog_route_catalog.go
    - backend/internal/web/catalog_route_stub.go
  modified:
    - backend/internal/web/router.go
    - backend/justfile
key-decisions:
  - "Example struct defined in examples.go (same package as catalog.templ) — no separate pages.go needed for single-page catalog design"
  - "catalog.templ uses inline <style> block for shell CSS (Tailwind utilities + minimal reset) — no app.css import per D-A04"
  - "Modal example renders panel-only via componentFunc wrapper — avoids position:fixed backdrop overlaying the catalog page (Pitfall 7)"
  - "justfile catalog target reuses generate + go run -tags catalog ./cmd/web pattern consistent with dev/worker targets"

requirements-completed: []

duration: ~3min
completed: "2026-05-16"
---

# Phase 13 Plan 05: Component Catalog Summary

**Build-tag-gated /ui-catalog route with single-page catalog rendering all 11 component types (badge, button, card, empty-state, form-field, icon-button, input, modal, select, table, textarea) for visual sign-off before Phase 14 begins.**

## Performance

- **Duration:** ~3 minutes
- **Started:** 2026-05-16T12:10:31Z
- **Completed:** 2026-05-16T12:13:41Z
- **Tasks:** 1 completed (Task 2 is a checkpoint — auto-approved in auto mode)
- **Files modified:** 6

## Accomplishments

- Created `backend/internal/web/ui/catalog/` package with `catalog.templ` (single-page layout) and `examples.go` (typed Example struct + 11 example functions)
- Created build-tag file pair: `catalog_route_catalog.go` (//go:build catalog, mounts GET /ui-catalog) and `catalog_route_stub.go` (//go:build !catalog, no-op)
- Wired `RegisterCatalogRoute(r)` unconditionally in `NewRouter` — stub satisfies symbol in production builds
- Added `just catalog` target to justfile for running the catalog server
- `go build ./...` and `go build -tags catalog ./...` both pass; `go test ./...` green (36 tests from Plans 01-04 unchanged)

## Task Commits

1. **Task 1: Create catalog package (catalog.templ + examples.go + route files + router wiring)** - `4046783` (feat)

## Files Created/Modified

- `backend/internal/web/ui/catalog/catalog.templ` - Single-page catalog layout: 240px sidebar with 11 anchor nav links (alphabetical), 11 component sections with DS-XX headings, inline Tailwind shell CSS (no app.css per D-A04)
- `backend/internal/web/ui/catalog/examples.go` - `Example` struct (Title, Preview, Snippet) + 11 typed example functions; modal renders panel-only (no backdrop wrapper, Pitfall 7)
- `backend/internal/web/catalog_route_catalog.go` - `//go:build catalog`; `RegisterCatalogRoute` mounts GET /ui-catalog → `catalogPageHandler()` via templ.Handler
- `backend/internal/web/catalog_route_stub.go` - `//go:build !catalog`; no-op `RegisterCatalogRoute` for production builds
- `backend/internal/web/router.go` - Added `RegisterCatalogRoute(r)` call after protected routes group, before healthz handler
- `backend/justfile` - Added `catalog` recipe: `just generate` + `go run -tags catalog ./cmd/web`

## Decisions Made

- **Example struct location:** Defined in `examples.go` instead of a separate `pages.go` — the backend uses a single-page catalog (not go-backend's multi-page static generator), so a Page struct with navigation is unnecessary.
- **Catalog shell CSS:** Inline `<style>` block in catalog.templ with only the minimal utilities needed for the catalog shell. No `app.css` import per design decision D-A04 (catalog must not depend on production CSS pipeline).
- **Modal panel rendering:** Uses a `componentFunc` wrapper to render the `ui-modal-panel` div directly with inline styles (`position:relative`) rather than using `ui.Modal(...)` which would emit the `ui-modal-backdrop` (position:fixed) overlay. This follows Pitfall 7 from RESEARCH.md.

## Deviations from Plan

None — plan executed exactly as written.

The only minor adaptation: the `Example` struct was added to `examples.go` directly (no separate file) since the single-page catalog design doesn't need the full `Page`/`Pages()` structure from go-backend's multi-page static generator.

## Known Stubs

None — all 11 component sections render actual components from Plans 01-04. No placeholder data or hardcoded empty values flow to the catalog UI. The catalog is a complete visual inventory of the design system built in this phase.

## Threat Flags

Threat model mitigations verified:
- **T-13-05-01 (Information Disclosure — /ui-catalog in production):** `//go:build catalog` + `//go:build !catalog` stub pair ensures the route compiles only with `-tags catalog`. `go build ./...` (no tag) succeeds with no-op stub; the `/ui-catalog` path does not exist in the production binary.
- **T-13-05-02 (Elevation of Privilege — catalog in dev):** Accepted; catalog is dev-only with no user data and no auth required by design.
- **T-13-05-03 (Information Disclosure — examples.go static strings):** Accepted; all demo strings are hard-coded display text with no secrets.

No new network endpoints, auth paths, or schema changes beyond the intended catalog route.

## Checkpoint

Task 2 (`checkpoint:human-verify`) was auto-approved (auto_advance=true). The catalog is ready for visual verification at http://localhost:8080/ui-catalog when running `just catalog` from the backend directory.

**How to verify:**
```bash
cd backend && just catalog
# Visit http://localhost:8080/ui-catalog
```

Expected: 11 section links in sidebar (alphabetical), each section renders component variants with templ call snippets below.

## Self-Check: PASSED

Files exist:
- backend/internal/web/ui/catalog/catalog.templ: FOUND
- backend/internal/web/ui/catalog/examples.go: FOUND
- backend/internal/web/catalog_route_catalog.go: FOUND
- backend/internal/web/catalog_route_stub.go: FOUND

Commits verified:
- 4046783 (feat(13-05): create catalog package with route files and router wiring): FOUND

Build verification:
- `go build ./...`: PASSED
- `go build -tags catalog ./...`: PASSED
- `go test ./... -count=1`: PASSED (all packages green)
