Add Arabic/Farsi/Urdu interval preset to font builder

[rxmmah]

• Adds 'arabic' preset in INTERVAL_PRESETS covering Arabic (U+0600-06FF),
  Arabic Supplement (U+0750-077F), Arabic Extended-A (U+08A0-08FF), and
  Arabic Presentation Forms-A/B (U+FB50-FDFF, U+FE70-FEFF) for Persian/
  Urdu letter coverage.
• Adds matching checkbox in the font builder UI.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 84de65f8-c6bc-4c9b-9c97-48e25f0595b2

📥 Commits

Reviewing files that changed from the base of the PR and between 9afea64 and 746ff34.

📒 Files selected for processing (1)

• scripts/font-builder/fontconvert_sdcard.py

📝 Walkthrough

Walkthrough

The font builder now supports Arabic Unicode intervals, and the fonts page documents and exposes an Arabic preset covering Arabic, Farsi, and Urdu.

Changes

Arabic font coverage

Layer / File(s)	Summary
Define Arabic Unicode ranges scripts/font-builder/fontconvert_sdcard.py	Adds Arabic, Arabic Supplement, Arabic Extended-A, and Arabic Presentation Forms to INTERVAL_PRESETS["arabic"].
Expose Arabic preset in fonts UI public/fonts.html	Adds Arabic coverage guidance and an “Arabic (Farsi, Urdu)” checkbox preset.
Estimated code review effort: 1 (Trivial)	~3 minutes

Possibly related PRs

• crosspoint-reader/crosspoint-tools#10: Adds another Unicode interval preset using the same INTERVAL_PRESETS pattern.

Suggested reviewers: uxjulia, itsthisjustin

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adding an Arabic/Farsi/Urdu interval preset to the font builder.
Description check	✅ Passed	The description is directly related to the changes and accurately mentions the new preset and matching UI checkbox.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[Uri-Tauber]

One thing: @YouHusam intentionally skipped on U+FDFD.
See his comment crosspoint-reader/crosspoint-reader#2541 (comment)

U+FDFD is a Unicode codepoint whose official name is "ARABIC LIGATURE BISMILLAH AR-RAHMAN AR-RAHEEM." It doesn't represent a letter or even a normal ligature — it's a single glyph that renders the entire opening phrase of the Quran, "بسم الله الرحمن الرحيم" ("In the name of God, the Most Gracious, the Most Merciful"), as one decorative unit. Font designers who want to support that traditional calligraphic rendering bake a whole-phrase glyph into the font at that codepoint. It's part of the "Arabic Presentation Forms-A" block (U+FB50–FDFF), tucked in among normal per-letter contextual forms.
Why it broke the converter?

[rxmmah]

@Uri-Tauber i corrected this.