Two step-by-step TDD plans derived from the 2026-09-14 design specs:
* theme-registry: 9 tasks, 70+ steps. Creates src/main/ThemeRegistry.js
(pure module), bootstrap with 37 themes, buildThemeMenu for main.js,
migrates 25 existing per-theme CSS blocks into src/styles/themes/<id>.css,
rewrites the renderer apply-theme function to toggle <link disabled>,
adds 12 new theme CSS files using shared token vocabulary.
* flowchart-editor: 8 tasks, 41 TDD steps. Pure renderer-side feature
(no main-process modules). Pure data store with IO injection, 5 SVG
shape functions, Mermaid translator, hand-rolled SVG canvas with
pointer events, sidebar panel wiring with debounced preview (250ms)
+ debounced persistence (500ms) + panel-scoped keyboard shortcuts.
Three minimal userData-path-validated IPC channels added for
persistence (renderer can't reach <userData> under the current
nodeIntegration:true security model without them).
Amit Haridas
