fix(mister): avoid no-op frontend.toml rewrites

[wizzomafizzo]

Summary

• skip frontend.toml serialization and atomic replacement when parsed configuration is unchanged
• preserve real-change durability with file and parent-directory syncs
• cover all config save helpers, normalization, metadata preservation, temp-file avoidance, and TOML NaN equality
• isolate Hub navigation tests from asynchronous warm-restore and persisted focus state

Tests

• just test
• just lint

Closes #325

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📥 Commits

Reviewing files that changed from the base of the PR and between e8512dc and 105c8b5.

📒 Files selected for processing (2)

• rust/zaparoo-core/src/config.rs
• tests/ui/tst_navigation.qml

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