fix: correct test expectation for U+3000 ideographic space under NFKC normalization

[Copilot]

sanitize_title.test.cjs had a wrong expectation: it asserted that the ideographic space U+3000 (　) would survive hardenUnicodeText, but NFKC normalization (step 6) maps U+3000 → U+0020.

Change

• Updated the expected value in the "should convert fullwidth ASCII to standard ASCII" test case from "Test　123" (U+3000) to "Test 123" (U+0020)
• Corrected the inline comment, which incorrectly stated U+3000 was not converted

// Before — wrong: NFKC does convert U+3000
expect(sanitizeTitle("Ｔｅｓｔ　１２３")).toBe("Test　123");

// After — correct
expect(sanitizeTitle("Ｔｅｓｔ　１２３")).toBe("Test 123");

[Copilot]

Pull request overview

Fixes an incorrect test expectation around Unicode normalization: under NFKC, the ideographic space U+3000 is normalized to a regular space U+0020, so it should not survive hardenUnicodeText.

Changes:

• Updated the expected output in the “fullwidth ASCII” test to use U+0020 instead of U+3000.
• Corrected the inline comment to reflect the actual NFKC behavior.

Show a summary per file

File	Description
actions/setup/js/sanitize_title.test.cjs	Updates the test expectation/comment to match NFKC normalization behavior (U+3000 → U+0020).

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