Preserve slash-separated EasyEDA pin labels

[hrithik18k]

Summary

• Parse EasyEDA pin names using their alignment-delimited field instead of restricting the allowed characters.
• Expand slash-separated multifunction labels into individual tscircuit pin aliases.
• Support parenthesized aliases.
• Normalize polarity suffixes using ASCII hyphen (-), en dash (–), and Unicode minus (−).
• Add focused regression tests and update the affected schematic and PCB snapshots.

Reproduction

The EasyEDA source for C472489 defines pin 20 as:

#RST/NMI/SBWTDIO

On main, the restrictive pin-name regex rejects the / characters. The generated component therefore falls back to pin20 and loses its functional aliases.

After this change, pin 20 is generated as:

pin20: ["N_RST", "NMI", "SBWTDIO"]

[GokulPandi-M]

@hrithik18k fixed in #510