Fix wrong audio sync delta after server-driven delay change

[maximmaxim345]

Server-initiated set_static_delay computed the audio sync delta from settings.static_delay_ms, which can lag the client's real delay when --static-delay-ms overrides settings or after a visualizer toggle. The audio worker then got a wrong correction.

[Copilot]

Pull request overview

This PR fixes incorrect audio sync correction when the server issues SET_STATIC_DELAY by tracking the currently applied static delay locally (instead of relying on settings.static_delay_ms, which can lag due to CLI overrides or client recreation).

Changes:

• Add an optional on_delay_changed callback to the TUI keyboard command handler so the app can mirror local delay changes.
• Track the applied delay in TUI (_applied_delay_ms) and daemon (_static_delay_ms) and compute server-driven delay deltas against that mirror.
• Ensure newly created/recreated SendspinClient instances receive the mirrored applied delay value.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 6 comments.

File	Description
sendspin/tui/keyboard.py	Adds an optional delay-change callback and wires it through keyboard_loop/CommandHandler.adjust_delay.
sendspin/tui/app.py	Introduces _applied_delay_ms, uses it when creating clients, and fixes server-driven delay delta computation.
sendspin/daemon/daemon.py	Mirrors applied delay in _static_delay_ms, uses it for client creation, and fixes server-driven delay delta computation.

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