* Add SI-prefix-aware sorting column for the parts table
Adds an optional "Name (SI)" column that parses numeric values with SI
prefixes (p, n, u/µ, m, k/K, M, G, T) from part names and sorts by the
resulting physical value. This is useful for electronic components where
alphabetical sorting produces wrong results — e.g. 100nF, 10pF, 1uF
should sort as 10pF < 100nF < 1uF.
Implementation:
- New SiValueSort DQL function with platform-specific SQL generation
for PostgreSQL (POSIX regex), MySQL/MariaDB (REGEXP_SUBSTR), and
SQLite (PHP callback registered via the existing middleware).
- The regex is start-anchored: only names beginning with a number are
matched. Part numbers like "MCP2515" or "Crystal 20MHz" are ignored.
- When SI sort is active, NATSORT is appended as a secondary sort so
that non-matching parts fall back to natural string ordering instead
of appearing in arbitrary order.
- The column is opt-in (not in default columns) and displays the parsed
float value, or an empty cell for non-matching names.
* Rename SI column from "Name (SI)" to "SI Value"
The column now shows the parsed numeric value rather than the part name,
so the label should reflect that.
* Support comma as decimal separator in SI value parsing
Part names using European decimal notation (e.g. "4,7 kΩ", "2,2uF")
were parsed incorrectly because the regex only recognized dots. Now
commas are normalized to dots before parsing, matching the existing
pattern used elsewhere in the codebase (PartNormalizer, price providers).
