Fix ZWNJ literal in fa_ir NOT_ALPHA message (staticcheck ST1018)

[cinar]

Problem

main is currently red: the build CI job fails on staticcheck:

locales/fa_ir.go:11:25: string literal contains the Unicode format character U+200C, consider using the '‌' escape sequence instead (ST1018)

Introduced in #231 (alpha/numeric checkers) — the fa-IR translation for NOT_ALPHA had a raw zero-width non-joiner character embedded directly in the string literal instead of the escaped form every other ZWNJ in this file already uses (see #178, which fixed this exact class of issue previously).

Fix

Replace the raw U+200C with the \u200c escape sequence, matching the existing convention in the same file.

Verification

Local staticcheck can't run in this environment (Go toolchain version mismatch unrelated to this change), so verified with a Unicode-category scan across every .go file in the repo for any Cf (format) character — confirms this was the only occurrence.

• go build, go vet, go test -race (100% coverage), gosec, revive all clean.

🤖 Generated with Claude Code

https://claude.ai/code/session_01FLdVmP5daHiknrTW4Geh2i

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (db36d1b) to head (c186cc3).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #235   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           58        60    +2     
  Lines         1087      1106   +19     
=========================================
+ Hits          1087      1106   +19     

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