games: fix font glyphs, Snake edge-wrap, snappier Snake

Font: add missing bitmap glyphs (/ # * + =) to both Snake and Tetris so
control labels like '4/6 MOVE' and '# PAUSE' render correctly. Also hoist
XSetForeground out of the per-pixel loop in draw_text (both games).

Snake: remove the wall-collision death; the head now wraps through the
opposite edge ((hx+COLS)%COLS, (hy+ROWS)%ROWS). Base speed raised from
70->100 px/sec (~128ms -> ~90ms per step) so it feels less laggy; the
+1 px/sec per 5 food progressive difficulty is unchanged.

src/games/snake.cpp

@@ -70,6 +70,11 @@ static const Glyph GLYPHS[] = {
   {'7', {0b11111,0b00001,0b00010,0b00100,0b01000,0b01000,0b01000}},
   {'8', {0b01110,0b10001,0b10001,0b01110,0b10001,0b10001,0b01110}},
   {'9', {0b01110,0b10001,0b10001,0b01111,0b00001,0b00010,0b01100}},
+  {'/', {0b00001,0b00010,0b00100,0b00100,0b01000,0b01000,0b10000}},
+  {'#', {0b01010,0b01010,0b11111,0b01010,0b11111,0b01010,0b01010}},
+  {'*', {0b00100,0b01010,0b11111,0b01010,0b00100,0b00000,0b00000}},
+  {'+', {0b00000,0b00100,0b00100,0b11111,0b00100,0b00100,0b00000}},
+  {'=', {0b00000,0b00000,0b11111,0b00000,0b11111,0b00000,0b00000}},
 };
 static const int NGLYPH = int(sizeof(GLYPHS) / sizeof(GLYPHS[0]));
 
@@ -101,8 +106,8 @@ static int ndirx = 1, ndiry = 0;   // buffered next direction
 static int foodx, foody;
 static int score = 0;
 static int best = 0;
-static int speed = 130;            // ms per step (derived from pps below)
-static int pps = 70;               // base speed px/sec; +1 px/sec per 5 food eaten
+static int speed = 90;             // ms per step (derived from pps below)
+static int pps = 100;              // base speed px/sec; +1 px/sec per 5 food eaten
 static unsigned long nextTick = 0;
 static bool running = true;
 static unsigned long now_ms() {
@@ -160,7 +165,7 @@ static void reset_game() {
   dirx = 1; diry = 0;
   ndirx = 1; ndiry = 0;
   score = 0;
-  pps = 70;
+  pps = 100;
   update_speed();
   place_food();
   state = PLAYING;
@@ -174,7 +179,9 @@ static void step() {
   }
   int hx = snake[snakelen - 1][0] + dirx;
   int hy = snake[snakelen - 1][1] + diry;
-  if (hx < 0 || hx >= COLS || hy < 0 || hy >= ROWS) { state = GAMEOVER; return; }
+  // wrap through the opposite edge instead of dying at the wall
+  hx = (hx + COLS) % COLS;
+  hy = (hy + ROWS) % ROWS;
   // self collision (ignore current tail cell since it will move, unless growing)
   for (int i = 0; i < snakelen - 1; i++) {
     if (snake[i][0] == hx && snake[i][1] == hy) { state = GAMEOVER; return; }
@@ -204,16 +211,14 @@ static void step() {
 
 static void draw_text(int x, int y, int scale, unsigned long col, const char* s) {
   int cx = x;
+  XSetForeground(dpy, gc, col);
   for (const char* p = s; *p; p++) {
     const unsigned char* g = glyph(*p);
     for (int r = 0; r < 7; r++) {
       unsigned char row = g[r];
-      for (int b = 0; b < 5; b++) {
-        if (row & (1 << (4 - b))) {
-          XSetForeground(dpy, gc, col);
+      for (int b = 0; b < 5; b++)
+        if (row & (1 << (4 - b)))
           XFillRectangle(dpy, back, gc, cx + b * scale, y + r * scale, scale, scale);
-        }
-      }
     }
     cx += 6 * scale;
   }

src/games/tetris.cpp

@@ -72,6 +72,11 @@ static const Glyph GLYPHS[] = {
   {'7', {0b11111,0b00001,0b00010,0b00100,0b01000,0b01000,0b01000}},
   {'8', {0b01110,0b10001,0b10001,0b01110,0b10001,0b10001,0b01110}},
   {'9', {0b01110,0b10001,0b10001,0b01111,0b00001,0b00010,0b01100}},
+  {'/', {0b00001,0b00010,0b00100,0b00100,0b01000,0b01000,0b10000}},
+  {'#', {0b01010,0b01010,0b11111,0b01010,0b11111,0b01010,0b01010}},
+  {'*', {0b00100,0b01010,0b11111,0b01010,0b00100,0b00000,0b00000}},
+  {'+', {0b00000,0b00100,0b00100,0b11111,0b00100,0b00100,0b00000}},
+  {'=', {0b00000,0b00000,0b11111,0b00000,0b11111,0b00000,0b00000}},
 };
 static const int NGLYPH = int(sizeof(GLYPHS) / sizeof(GLYPHS[0]));
 static const unsigned char* glyph(char c) {
@@ -245,15 +250,14 @@ static void reset_game() {
 
 static void draw_text(int x, int y, int scale, unsigned long col, const char* s) {
   int cx = x;
+  XSetForeground(dpy, gc, col);
   for (const char* p = s; *p; p++) {
     const unsigned char* g = glyph(*p);
     for (int r = 0; r < 7; r++) {
       unsigned char row = g[r];
       for (int b = 0; b < 5; b++)
-        if (row & (1 << (4 - b))) {
-          XSetForeground(dpy, gc, col);
+        if (row & (1 << (4 - b)))
           XFillRectangle(dpy, back, gc, cx + b * scale, y + r * scale, scale, scale);
-        }
     }
     cx += 6 * scale;
   }