Add LED letter tutorial

[kebanks2]

/claim #50

Adds a LedLetter tutorial for the archived bounty request: tscircuit/docs-old#50

Summary:

• Adds docs/tutorials/drawing-led-letters.mdx.
• Implements a reusable LedLetter component with hard-coded A-Z 5 by 7 glyphs.
• Uses math to lay out PCB and schematic positions from glyph row/column coordinates.
• Uses one current-limiting resistor per lit LED pixel and defaults to 0603 LEDs / 0402 resistors.
• Includes usage notes for .

Validation:

• git diff --check
• MDX compile check with @mdx-js/mdx
• Remote raw file matches the locally checked file byte-for-byte

Note: this environment does not have Bun installed, so I could not run the repo's bun run build or bun run typecheck commands locally.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview, Comment	May 20, 2026 3:47am

[github-actions]

This PR has been automatically marked as stale because it has had no recent activity. It will be closed if no further activity occurs.

[kebanks2]

Still active and ready for review. This PR addresses the LED letter tutorial bounty route from tscircuit/docs-old#50.

Current validation status remains green from the PR checks:

• build: success
• format-check: success
• type-check: success
• Vercel preview: ready

No secrets or private data are included.