Replace Streamlit dashboard with B1 HTMX front-end

[kevrez]

What & why

The operator dashboard was Streamlit, which can't reproduce the B1 "Concrete · Amber Dark" design (brutalist, 0-radius, ink borders, hard offset shadows, single vermilion accent, pixel-precise master/detail), isn't responsive, and is expensive to restyle. This rebuilds the front-end as server-rendered Jinja2 + HTMX on the existing FastAPI app — in-process, no Node build, no second deployment — defaulting to light with a working dark/light toggle.

Approach

• New src/ecommerce_agent/web/: shell (250px sidebar + 74px topbar), b1.css design system encoding both palettes as data-theme tokens plus every component, vendored htmx.min.js, minimal app.js (theme toggle, dropdowns, master/detail selection, removable tags, aspect→size). Web handlers reuse the same service/session layer as the JSON API (no self-HTTP).
• Icons are the prototype's exact 20×20 SVG paths.

Designed screens (pixel-faithful, real data)

• Trend Inbox — signal list + detail; momentum derived from apparel_score, real evidence/risks/sources, functional Refresh.
• Research Reports — list + reading pane; TOC + section heads derived from report markdown (minimal renderer, no new dep); opportunity score derived from the linked trend.
• Etsy Posting — pipeline (stages mapped from real item statuses) + listing editor with live removable tags, readiness row, save/validate/publish.
• Design Studio — composer + version-tracked lineage library + focus detail; per-line delete, real meta chips.

Group B (restyled in B1)

Product Drafts, Printful Workshop, Analytics, Agent Runs · Logs (with polling). Approval Queue dropped per product decision; standalone Etsy Listings folded into the 8-item nav.

Reconciliation

Elements with no backing data render as honest placeholders (Workshop Score → n/a, sparklines/model dropdowns cosmetic) rather than fabricated numbers — see the inventory in the planning notes.

Cutover

Deletes dashboard/, drops the streamlit dependency, removes the dashboard compose service, and updates Makefile/Dockerfile. The UI is now served by the api service at http://localhost:8000/.

Verification

• 122 tests pass (3 integration deselected), including 16 new DB-backed web smoke tests covering every screen's route → DB → render path.
• ruff, ruff format --check, and mypy --strict all clean.
• Not yet pixel-diffed in a browser — run make up and compare against assets/design_handoff_b1_workshop/screenshots/.

🤖 Generated with Claude Code