fix: GUI max-width on wrapper + visible TTS swap result + warning cleanup

GUI MAX-WIDTH (was still stretched)

Root cause v2: my earlier rule applied max-width to #header and main
INDIVIDUALLY, but they live inside <Container fluid id="wrapper"> from
svelteui which goes full viewport width. Both children inherited that
full width from the flex layout. Constraining each child wouldn't help
when their PARENT was unconstrained.

Fix: max-width:1280px !important on #wrapper itself, with margin:0 auto.
Now the whole app (header + main) sits in a centred 1280px column on
wide monitors. !important is unfortunate but Container's width:100%
sometimes wins under HMR otherwise.

VISIBLE TTS SWAP RESULT (was failing silently)

User saved 'Piper' in dropdown → green 'Saved!' banner → active engine
chip still showed 'sapi'. Root cause: when Piper isn't installed,
`tts::build_backend("piper")` falls back to SAPI internally, but
`set_tts_backend` just logged a warning and returned a generic string.
The GUI couldn't tell the difference between success and silent fallback.

Fix:
- `set_tts_backend` now returns `TtsSwapResult { requested, applied,
  fell_back, note }`. The Svelte page reads `applied` (actual installed
  backend), checks `fell_back`, and shows an ORANGE notification with
  the concrete fix ("запусти tools/piper/install.ps1 чтобы скачать
  бинарь") instead of a green 'saved' lie.
- Saves now also call `refreshActiveBackends()` so the live chip
  ("Активный движок: TTS: sapi") updates without page reload.
- Green notification when swap succeeded normally.

WARNING CLEANUP

- jarvis-app/main.rs: removed unreachable `_ => {}` arm (all IpcAction
  variants are explicit now).
- jarvis-app/tray.rs: moved `info!("Tray initialized.")` to BEFORE the
  Windows message-pump loop (the loop runs forever, so the original
  position was unreachable).
- jarvis-gui/main.rs: dropped unused #[macro_use] on simple_log.
- jarvis-gui/events.rs: #[allow(dead_code)] on Payload struct +
  EventTypes impl + `play` fn — they're intentional API surface for
  future event-emitter wiring, not actual dead code.
- Plus a `cargo fix` pass for misc unused imports.

Down from 12 warnings to 1 (npm-build-completion notice — informational).

Tests: 140 rust + 115 python (was 104, +11 for new wave59_handlers).
Release builds of jarvis-app + jarvis-gui both green.

crates/jarvis-app/src/app.rs

@@ -2,7 +2,6 @@ use std::sync::mpsc::Receiver;
 use std::time::SystemTime;
 
 use jarvis_core::{audio_buffer::AudioRingBuffer, audio_processing, audio_processing::vad::listen_window::{ListenWindow, WindowDecision}, audio_processing::vad::webrtc::WebRtcVad, commands, config, listener, recorder, stt, COMMANDS_LIST, intent, voices, ipc::{self, IpcEvent}, i18n, slots};
-use rand::seq::SliceRandom;
 
 use crate::should_stop;
 

crates/jarvis-app/src/main.rs

@@ -240,7 +240,6 @@ fn main() -> Result<(), String> {
                     version: config::APP_VERSION.map(|s| s.to_string()),
                 });
             }
-            _ => {}
         }
     });
 

crates/jarvis-app/src/tray.rs

@@ -7,10 +7,8 @@ use tray_icon::{
 use image;
 use std::process::Command;
 
-#[cfg(target_os="windows")]
-use winit::platform::windows::EventLoopBuilderExtWindows;
 
-use jarvis_core::{config, i18n, voices, ipc::{self, IpcEvent}, SettingsManager};
+use jarvis_core::{i18n, voices, ipc::{self, IpcEvent}, SettingsManager};
 
 const TRAY_ICON_BYTES: &[u8] = include_bytes!("../../../resources/icons/32x32.png");
 
@@ -29,6 +27,7 @@ pub fn init_blocking(settings: SettingsManager) {
         .unwrap();
 
     let menu_channel = MenuEvent::receiver();
+    info!("Tray initialized.");
 
     #[cfg(target_os = "linux")]
     {
@@ -77,8 +76,6 @@ pub fn init_blocking(settings: SettingsManager) {
             std::thread::sleep(std::time::Duration::from_millis(50));
         }
     }
-
-    info!("Tray initialized.");
 }
 
 fn handle_menu_event(event: &MenuEvent, settings: &SettingsManager, tray_state: &menu::TrayState) {

crates/jarvis-app/src/tray/menu.rs

@@ -1,7 +1,6 @@
 use tray_icon::menu::{CheckMenuItem, Menu, MenuItem, PredefinedMenuItem, Submenu};
 
 use jarvis_core::{i18n, voices, SettingsManager};
-use jarvis_core::config::structs::{WakeWordEngine, NoiseSuppressionBackend};
 
 // RADIO GROUP