Preserve multiplexed EasyEDA pin aliases

[GokulPandi-M]

Motivation

EasyEDA pin names containing /, dots, parentheses, or Unicode minus characters were rejected by the parser and replaced with numeric fallback labels. This made alternate functions such as #RST/NMI/SBWTDIO unavailable when wiring imported components.

Changes

• capture the complete tilde-delimited EasyEDA pin-name field
• expose multiplexed functions as separate pinLabels aliases
• normalize generated aliases to ASCII letters, numbers, and underscores
• preserve Unicode and punctuation in raw schematic display labels
• trust normalized source_port.port_hints when generating custom symbols
• normalize ASCII hyphen, en dash, and Unicode minus polarity suffixes to _NEG
• treat polarity-only schematic text as display decoration instead of creating false pin aliases

Verification

Real-part regression coverage and rendered schematic snapshots are included for:

• C472489: slash-separated, active-low, and dotted aliases
• C14877: parenthesized alternate functions
• C2886621: Unicode en-dash polarity
• C2979182: polarity-only display text

bun run build, bun run format:check, and the complete test suite pass (209 tests, 66 snapshots).

[ShiboSoftwareDev]

• codex review:
  • Keep display/raw pin labels separate from selector-safe aliases, especially Unicode polarity characters. Don't mutate pin.label merely to make an alias usable.
  • Clarify/fix PC0(ADC0) behavior and add a unit test for a single parenthesized alternate function.

[ShiboSoftwareDev]

too many, changes, hard to know what is fixed and what regressed

[GokulPandi-M]

The actual fix is limited to the pin parsing and alias handling. Most of the diff is just snapshot updates caused by the label changes. @ShiboSoftwareDev