feat(ui): shareholder-grade redesign + live "Your Club" account panel

- New theme.rs design system: palette, embedded fonts, egui Visuals/Style,
  card()/status_pill() helpers.
- Branded hero header (OF monogram), left nav rail, card-based dashboard,
  console-style Logs, themed Config tab, window/taskbar icon.
- New account_monitor.rs: background AccountMonitor (mirrors HealthMonitor,
  5s non-blocking poll) driving a live "Your Club" dashboard card (club
  name/abbr, manager, COINS hero number, level + XP bar, unopened packs,
  funds) with loading/offline/error states.
- account_sync.rs/app.rs/config.rs/main.rs wired to the monitor + theme.
  All existing launch/health/preflight/service/config logic preserved.

src/account_monitor.rs

@@ -0,0 +1,122 @@
+//! Read-only background polling of the OpenFUT account summary.
+//!
+//! The launcher already POSTs `/openfut/account/sync` once at launch time
+//! (see [`crate::account_sync::sync`]) to select the active profile. This
+//! module reuses that request in a background thread so the Dashboard can show
+//! a live "Your Club" card — coins, level, packs — without ever blocking the UI
+//! thread on the network. It mirrors [`crate::health::HealthMonitor`]: a shared
+//! target the UI re-points when the server config changes, and a shared state
+//! snapshot the UI renders each frame.
+
+use std::{
+    sync::{
+        atomic::{AtomicBool, Ordering},
+        Arc, Mutex,
+    },
+    thread,
+    time::{Duration, Instant},
+};
+
+use crate::account_sync::{self, AccountSummary};
+use crate::config::LauncherConfig;
+
+const POLL_INTERVAL: Duration = Duration::from_secs(5);
+
+/// A snapshot of the last account fetch, rendered by the dashboard.
+#[derive(Clone, Default)]
+pub struct AccountState {
+    /// The most recently fetched summary, or None while none has succeeded.
+    pub summary: Option<AccountSummary>,
+    /// The error from the latest failed attempt (cleared on success).
+    pub error: Option<String>,
+    /// Whether a server target is currently configured. `false` = idle: the
+    /// launcher has nothing to poll, so the UI shows the "connect" prompt.
+    pub configured: bool,
+    pub last_checked: Option<Instant>,
+}
+
+impl AccountState {
+    /// True when the latest error looks like a connectivity failure (server
+    /// down / unresolvable) rather than a protocol/validation error. Lets the
+    /// UI show the calm "offline" prompt for the common "server not up" case
+    /// and reserve the loud error state for genuinely broken responses.
+    pub fn unreachable(&self) -> bool {
+        self.error.as_deref().is_some_and(|e| {
+            e.contains("cannot connect")
+                || e.contains("cannot resolve")
+                || e.contains("resolved to no addresses")
+        })
+    }
+}
+
+/// Background poller. Holds a shared target config the UI can update when the
+/// user changes the server address/account, and a shared state the UI reads.
+pub struct AccountMonitor {
+    pub state: Arc<Mutex<AccountState>>,
+    target: Arc<Mutex<Option<LauncherConfig>>>,
+    running: Arc<AtomicBool>,
+}
+
+impl AccountMonitor {
+    pub fn new() -> Self {
+        let state = Arc::new(Mutex::new(AccountState::default()));
+        let target: Arc<Mutex<Option<LauncherConfig>>> = Arc::new(Mutex::new(None));
+        let running = Arc::new(AtomicBool::new(true));
+
+        let t_state = Arc::clone(&state);
+        let t_target = Arc::clone(&target);
+        let t_running = Arc::clone(&running);
+        thread::spawn(move || {
+            while t_running.load(Ordering::Relaxed) {
+                let target = t_target.lock().unwrap().clone();
+                match target {
+                    None => {
+                        // No server configured — reset to the idle prompt state.
+                        *t_state.lock().unwrap() = AccountState::default();
+                    }
+                    Some(config) => {
+                        let result = account_sync::sync(&config);
+                        let mut state = t_state.lock().unwrap();
+                        state.configured = true;
+                        state.last_checked = Some(Instant::now());
+                        match result {
+                            Ok(summary) => {
+                                state.summary = Some(summary);
+                                state.error = None;
+                            }
+                            Err(error) => {
+                                // Drop the stale summary so the card never shows
+                                // populated data alongside an error/offline pill.
+                                state.summary = None;
+                                state.error = Some(error);
+                            }
+                        }
+                    }
+                }
+                thread::sleep(POLL_INTERVAL);
+            }
+        });
+
+        Self {
+            state,
+            target,
+            running,
+        }
+    }
+
+    /// Point the monitor at a new server/account. `None` (no server configured)
+    /// puts it back into the idle prompt state.
+    pub fn set_target(&self, target: Option<LauncherConfig>) {
+        *self.target.lock().unwrap() = target;
+    }
+
+    pub fn snapshot(&self) -> AccountState {
+        self.state.lock().unwrap().clone()
+    }
+}
+
+impl Drop for AccountMonitor {
+    fn drop(&mut self) {
+        self.running.store(false, Ordering::Relaxed);
+    }
+}