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Avoid repeated theme DOM sync during startup #2779

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Guard theme sync media queries

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Avoid repeated theme DOM sync during startup #2779

Guard theme sync media queries
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MacroscopeApp / Macroscope - Approvability Check succeeded May 22, 2026 in 4m 46s

Approved (click on check for details)

  • Eligibility
  • Correctness

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Details

Eligibility
Performance optimization that adds caching to skip redundant theme DOM updates, plus defensive checks for matchMedia availability. Changes are self-contained with unit tests, and the author has prior contributions to this file.

Notes:
No code owners found in target merge base d1e85c4

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