[A-EDev]

Summary

Part 4 of 22 of the music player plan (Android parity). Stacked on fix/music-playback-recovery (PR #180); review and merge in order.

• The music EQ turns the curve down by its highest boost before the filters (Android's EqFilterMath, 257 points) and ends in Android's soft clipper, so boosts no longer distort.
• Music loudness normalization has a switch (setting music_loudness_normalization, on by default).
• Downloads keep the song's loudness value (migration 0018_downloads_loudness.sql, a nullable column), so offline songs play at the streamed level.

Related issue

Change type

• Bug fix
• Feature
• Refactor or maintenance
• Documentation
• Build, packaging, or CI

Validation

• pnpm test: 445 tests passed, 0 failed
• pnpm build: passed
• cargo fmt --manifest-path src-tauri/Cargo.toml --all -- --check: clean
• cargo clippy --manifest-path src-tauri/Cargo.toml --all-targets --all-features: no new warnings against main (compared at the top of the stack)
• cargo test --manifest-path src-tauri/Cargo.toml --all-targets --all-features: 783 passed, 0 failed (all sync_* suites included)
• I smoke-tested the affected desktop behavior. macOS, combined build: Bass Boost preset shows an auto preamp of -8.9 dB.
• OS/device: device testing by the owner. The checks above ran on macOS 27 (Apple Silicon MacBook Pro, 120 Hz) in a dev build of the whole stack; Windows and Linux were not run.

Screenshots or recordings

Risk and compatibility

• Migration 0018 adds a nullable downloads.loudness_db column. Songs downloaded before stay un-normalized.
• No new secrets, private data, telemetry, or broad Tauri permissions were introduced.
• User-facing documentation was updated where needed (changelog entry in v0.1.0-beta3.txt).
• Dependency and lockfile changes are intentional and limited to this PR. No dependency changes.
• Breaking changes and upgrade steps are clearly documented. No breaking changes.

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