feat(audio): graphic equalizer with presets and custom bands

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Adds a 10-band graphic equalizer to AudioSettings (enabled flag +
per-band dB gains, normalised to 10 entries and clamped to range).
Presets return gain curves; the settings page gains EQ UI. libmpv
applies the filter on Linux (Android parity pending). Old persisted
settings without EQ fields load as disabled + flat.

Also includes the requirements/traceability/ux-flows doc updates for
this feature and the home long-press routing (UR-058/DR-087).

TRACES: UR-027 | IR-020, DR-030 | UT-079, UT-080, UT-081, UT-082

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dtourolle

2026-07-24 23:49:13 +02:00

parent 589f08b873

commit c543f90ad3

9 changed files with 1454 additions and 369 deletions

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docs/traceability.md

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