v4.2.0: wire the GUI to the core, transport and all four games

Phase 4. The egui frontend now shares ClientCore and the client database with the terminal: one background worker owns TLS, trust answers go through a channel, and a 10 s request deadline mirrors the terminal socket timeout. First contact, a changed key and a version mismatch are explicit screens; login can remember the credential and auto-login signs in before the login form appears.

Adds the lobby with an update notice, a full-width scrollable history table, and the four games painted from View: slots with reel animation and win lines that stop at the last matching reel, roulette with the hover lattice and wheel spin, blackjack with vector-drawn suits, and a smooth crash curve. Sidebars pin their action block; leaving a live hand or round asks before forfeiting.

The header balance holds the staked amount while the reels or wheel turn and only shows the payout when they stop. Refused spins cancel the animation. Live crash multipliers keep full precision for the chart; the terminal still displays two decimals.

Verified live against a 4.2.0 server: register, login, auto-login, trust, all four games settling, history (50 rows), logout, disconnect, forfeit confirmation, and the version-mismatch screen. Release: 8.3 MB Linux, 6.8 MB Windows, 61 ms to window, 131 MB idle RSS.

1 files changed, 33 insertions, 5 deletions

diff --git a/gui/src/main.rs b/gui/src/main.rs
index cf1c67d..82babb6 100644
--- a/gui/src/main.rs
+++ b/gui/src/main.rs
@@ -1,12 +1,36 @@
 //! Desktop frontend for zagan-bet.
 //!
-//! Phase 3 of `docs/GUI-PLAN.md`: the style spike. It owns the window and the
-//! roulette reference screen; the shared core and transport are wired in
-//! Phase 4.
+//! Phase 4: the egui shell over the shared `ClientCore`, with the transport on
+//! a worker thread. The same data directory and flags as the terminal client.
 
-use zagan_bet_gui::app::ZaganApp;
+use zagan_bet::client::paths::{default_data_dir, parse_args};
+use zagan_bet_gui::app::{Startup, ZaganApp};
 
 fn main() -> eframe::Result {
+    let args = match parse_args(std::env::args().skip(1)) {
+        Ok(args) => args,
+        Err(message) => {
+            eprintln!("{message}");
+            std::process::exit(2);
+        }
+    };
+    if args.help {
+        println!(
+            "usage: zagan-bet-gui [-d <dir>] [--unsafe]
+
+  -d, --data-dir <dir>   where to keep client.db (default: XDG data dir)
+      --unsafe           skip certificate verification
+  -h, --help             show this message"
+        );
+        return Ok(());
+    }
+
+    let data_dir = args.data_dir.unwrap_or_else(default_data_dir);
+    if let Err(error) = std::fs::create_dir_all(&data_dir) {
+        eprintln!("Cannot create {}: {error}", data_dir.display());
+        std::process::exit(1);
+    }
+
     let options = eframe::NativeOptions {
         viewport: eframe::egui::ViewportBuilder::default()
             .with_title("Zagan-Bet")
@@ -17,9 +41,13 @@ fn main() -> eframe::Result {
         ..Default::default()
     };
 
+    let startup = Startup {
+        data_dir,
+        unsafe_mode: args.unsafe_mode,
+    };
     eframe::run_native(
         "Zagan-Bet",
         options,
-        Box::new(|cc| Ok(Box::new(ZaganApp::new(cc)))),
+        Box::new(move |cc| Ok(Box::new(ZaganApp::new(cc, startup)))),
     )
 }