fix(tqfp44): default pitch to 0.8mm and pad width to 0.55mm

[rudra496]

Summary

Fixes #792.

Previously, `fp.string("tqfp44")` was grouped with 48/64/100 pin packages in `src/fn/tqfp.ts`, producing a 44-pin QFP on a `0.5mm` pitch with `0.30mm`-wide pads. Standard TQFP-44 (JEDEC MS-026 BBA / KiCad `TQFP-44_10x10mm_P0.8mm`) is a 10x10mm body on a `0.8mm` pitch with `0.55mm` pad width.

Changes

1. Pitch & Pad Width Defaults: Grouped `case 44` with `case 32` in `src/fn/tqfp.ts` to default pitch to `0.8mm` and pad width to `0.55mm`.
2. Unit Tests: Added `tests/tqfp44-pitch.test.ts` verifying that `fp.string("tqfp44")` emits pads with 0.8mm pitch spacing and 0.55mm pad width.

Verification

• `bun test tests/tqfp44-pitch.test.ts` (1/1 passing).

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