Add multiplayer bots, typing languages, and rework the UI layout

Multiplayer
- Quick match: POST /api/multiplayer/quickmatch returns whichever room is
  still filling, or opens one. Players never see a room code; joining by
  code stays for racing specific people.
- Bots fill quick-match rooms after a short wait so a new game is never an
  empty lobby. They only ever join quick-match rooms, never a room opened
  by code. One or two per room, drawn from separate ~40 and ~80 WPM tiers so
  two bots are never near each other's pace, and they stall to correct
  mistakes rather than typing a clean straight line.
- Live player count via GET /api/multiplayer/online, shown on the
  Multiplayer control and under the main menu's Multiplayer button.
- Per-racer colours: you are the theme accent, opponents take distinct hues
  that stay the same from lobby to race.
- The countdown no longer holds the room lock for its full three seconds,
  which is what reset clients mid-countdown.

Typing languages
- 16 languages for the generated-word modes, each with its own
  high-frequency vocabulary rather than a translation of the English list.
- Picker in the top-right rail; non-English uses its own list at every
  difficulty tier instead of falling back to English words.

Fix UTF-8 accuracy in the game core
- update_game_state mixed byte and character counts: total_characters_typed
  accumulated byte-length deltas while total_correct_characters compared a
  char index against that byte count. Equal on ASCII, so it went unnoticed;
  a correctly typed Spanish passage scored 6%. The old byte slicing would
  also have panicked if an index landed inside a multi-byte character.
  Rewritten char-based, with regression tests.

Programming mode
- Replaced prose about programming with real code: 26 syntax-highlighted
  snippets across JavaScript, Python, Rust, C/Go/Java and shell. Single-line
  by necessity, since the typing input is a single-line field.

Layout and readability
- One icon rail arrangement on every screen: Settings/Store under the
  wordmark, Language/Theme/Friends/Account top-right, Stats/Leaderboard/
  Multiplayer bottom-right.
- Main menu: mode picker moved out of the Single Player button, which it was
  notching a divider through and pushing the label off-centre.
- Escape returns to the menu, closing any open popover first, and confirms
  before abandoning a live race.
- Split --text-color and --sub-color per theme; they shared one value that
  measured 3.65:1 against the background, below the 4.5:1 body-text floor.
- Semantic colours used in exactly one place each: gold for a personal best,
  amber for the race countdown and the mobile-result badge.
- Passage now sits in the same place on the typing and end screens, and its
  column is a whole number of characters wide so wrapping cannot leave a
  permanent gap on the right.
- End screen: keystrokes and a correct/wrong/extra/missed split, attribution
  carried over from the typing screen, and a graph with a separate error
  axis, axis titles including seconds, and smoothed lines.

1 files changed, 60 insertions, 17 deletions

diff --git a/Cargo.toml b/Cargo.toml
index b2209a5..15205f9 100644..100755
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,21 +1,64 @@
-[package]
-name = "typerpunk"
+[workspace]
+members = [
+    "crates/core",
+    "crates/tui",
+    "crates/wasm",
+    "crates/steam",
+    "crates/server"
+]
+resolver = "2"
+
+[workspace.package]
 version = "0.1.0"
 edition = "2021"
+authors = ["Your Name <[email protected]>"]
+license = "MIT"
+description = "A modern typing test application with TUI and web interfaces"
+
+[workspace.dependencies]
+# Core dependencies
+tokio = { version = "1.0", features = ["full"] }
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+anyhow = "1.0"
+thiserror = "1.0"
+config = "0.13"
+dirs = "5.0"
+rlua = "0.19"
+rand = "0.8"
+
+# Terminal UI
+crossterm = "0.27"
+ratatui = "0.24"
+
+# Web/WASM
+wasm-bindgen = "0.2"
+js-sys = "0.3"
+web-sys = "0.3"
+wasm-bindgen-futures = "0.4"
+wasm-timer = "0.2"
+
+# Networking
+tokio-tungstenite = { version = "0.20", features = ["native-tls"] }
+futures-util = "0.3"
 
-[dependencies]
-crossterm = "0.27.0"
-tui = { version = "0.19.0", features = ["crossterm"], default-features = false }
-termion = "3.0.0"
-rand = "0.8.5"
-paragraph = "0.0.2"
-console = "0.15.8"
-ansi_term = "0.12.1"
-serde_json = "1.0.114"
-regex = "1.6.1"
-ureq = "2.9.6"
-tokio = { version = "1.36.0", features = ["full"] }
+# Backend server
+axum = { version = "0.7", features = ["ws"] }
+axum-extra = { version = "0.9", features = ["cookie"] }
+tower = "0.4"
+tower-http = { version = "0.5", features = ["cors", "trace"] }
+sqlx = { version = "0.7", features = ["runtime-tokio-rustls", "sqlite", "time", "uuid"] }
+argon2 = "0.5"
+reqwest = { version = "0.11", default-features = false, features = ["json", "rustls-tls"] }
+uuid = { version = "1.10", features = ["v4", "serde"] }
+time = { version = "0.3", features = ["serde"] }
+dashmap = "6.1"
+dotenvy = "0.15"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 
-[[bin]]
-name = "typerpunk"
-path = "src/main.rs"
+# Steam desktop client
+# Using full default features for now (guarantees DefaultPlugins resolves).
+# Trimming to a minimal feature set is a later optimization once this builds
+# cleanly - don't fight feature-flag mismatches without a compiler to check against.
+bevy = "0.19"