api-types: standalone crate with DTOs (widget, data source, layout, preset)
extracted from http-api. Shared between http-api and future SPA.
thiserror: replaced all manual Display impls with derive macros across
8 crates (config-sqlite, config-memory, tcp-server, tcp-client,
http-json, rss, media, application).
SQLite config store: full ConfigRepository impl with JSON serialization
for mappings, layouts, data source configs. 12 integration tests.
HTTP API: Axum REST endpoints for widgets, data sources, layout, presets.
6 integration tests using tower::oneshot.
Port traits updated to return Send futures for Axum compatibility.
boot logo (procedural hexagon + K), WiFi (WPA auto-detect with retries),
TCP client connects and receives ScreenUpdate/DataUpdate messages,
display renders widget data. Makefile with esp-flash/server/desktop targets.
known issues: boot logo not cleared, text overlaps, occasional reconnect