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, 62 insertions, 0 deletions

diff --git a/install.sh b/install.sh
new file mode 100755
index 0000000..ea51284
--- /dev/null
+++ b/install.sh
@@ -0,0 +1,62 @@
+#!/bin/bash
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+# Function to print status messages
+print_status() {
+    echo -e "${GREEN}[*]${NC} $1"
+}
+
+# Function to print error messages
+print_error() {
+    echo -e "${RED}[!]${NC} $1"
+}
+
+# Function to print warning messages
+print_warning() {
+    echo -e "${YELLOW}[!]${NC} $1"
+}
+
+# Check if Rust is installed
+if ! command -v rustc &> /dev/null; then
+    print_status "Rust not found. Installing Rust..."
+    curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+    source "$HOME/.cargo/env"
+else
+    print_status "Rust is already installed"
+fi
+
+# Check if cargo is installed
+if ! command -v cargo &> /dev/null; then
+    print_error "Cargo not found. Please install Rust properly."
+    exit 1
+fi
+
+# Try to generate texts.json from packs if node is available (no npm packages required)
+if command -v node &> /dev/null; then
+    if node scripts/merge_packs.js; then
+        print_status "Merged packs into texts.json"
+    else
+        print_warning "merge_packs.js failed; using existing texts.json"
+    fi
+else
+    print_warning "node not found; skipping dataset pack merge. Ensure texts.json exists at repo root."
+fi
+
+# Build the TUI version
+print_status "Building the TUI version..."
+cargo build --release --package typerpunk-tui --features tui
+
+if [ $? -eq 0 ]; then
+    print_status "Build successful! The TUI executable is located in target/release/typerpunk"
+    print_status "You can run it with: ./target/release/typerpunk"
+else
+    print_error "Build failed. Please check the error messages above."
+    exit 1
+fi
+
+print_status "Installation complete!" 
\ No newline at end of file