Adds a "Value calculator" tool (Tools menu) that decodes/encodes the value of
common components and generates a clean SVG picture you can attach to a part —
handy for assortments imported with blank thumbnails and sparse data.
Calculator tabs (bidirectional decode <-> encode), each drawing the part to the
selected package with a collapsible appearance panel and an "attach to part"
action (optionally as the master picture):
- Resistor: 4/5/6-band colour code
- Capacitor: value <-> 3-digit code <-> tolerance
- SMD resistor: value <-> 3-digit / 4-digit / EIA-96 code
- Inductor: colour-band code
- SMD inductor: value <-> uH code
Bulk "Generate component images" parts-table action:
- Classifies each selected part (resistor / capacitor / inductor / diode / LED,
THT or SMD) with ComponentValueGuesser and detects value, voltage, tolerance,
power, ppm, pitch, diameter, colour, SMD package and marking from the name,
description and parameters.
- Renders a preview per part, lets you tweak appearance, and attaches the images
in one go; can also write matching KiCad symbol/footprint/reference-prefix EDA
fields.
Backend: ComponentValueGuesser (classification + detection + EDA suggestion),
GeneratedImageAttachmentHelper (stores the SVG through the existing attachment
pipeline, so it is sanitised on save), two POST endpoints on PartController
(generate_image, set_eda) guarded by `edit` + CSRF, a new `@tools.value_calculator`
permission, a Tools-tree entry and docs. All drawing is client-side in a Stimulus
controller; the un-sanitised live preview escapes part-derived text and validates
colours as defence-in-depth.
Tests: unit tests for ComponentValueGuesser and functional tests for the
endpoints, including permission and CSRF enforcement and the persisted side
effects.