feat: add tsop48 footprint generator

[KrishnaX12]

Resolves #2 (partially, implements TSOP footprint).

This PR implements the missing TSOP (Thin Small Outline Package) footprint generator.

Since TSOP is a standard dual-row SMD package like TSSOP or SOIC, this generator uses similar parameter logic to calculate row gaps and accurately place pads.

Changes:

• Added tsop generator in src/fn/tsop.ts with appropriate default dimensions
• Registered tsop footprint inside src/footprinter.ts and src/fn/index.ts
• Added test coverage for tsop48 (tsop48_w18.4_h12.4_p0.5mm) with generated SVG snapshots

Alignment Analysis (Boolean Difference):

[seveibar]

Reference chip?

[KrishnaX12]

@seveibar
Ref :

This footprint represents the standard 48-pin TSOP-I package. It is the industry standard for NAND and NOR Flash memory ICs.
Here are two real-world reference chips that use this exact footprint:
Micron MT29F2G08ABAEA (2Gb NAND Flash)
Cypress/Spansion S29GL128S (128Mb NOR Flash)

[seveibar]

Wrong knotch size

[KrishnaX12]

@seveibar
Replaced the curved notch entirely with KiCad's actual straight silkscreen tail + diagonal chamfer matching TSOP-I-48_18.4x12mm_Pitch0.5mm.kicad_mod — please re-review!

[seveibar]

worse, missing pin1 indicator in some cases

[KrishnaX12]

I've visually verified the updated SVGs to confirm the Pin 1 tail is rendered correctly.

[rushabhcodes]

lg, but also take review form techmannih or seveibar