Improve WMO wall collision, unstuck, interior zoom, and chat focus

- Stronger wall collision push (0.35/0.15) and swept push (0.45/0.25)
  for interior/exterior WMOs to reduce clipping through tunnel walls
- Use all triangles (not just pre-classified walls) for collision checks
- Allow invisible collidable triangles (MOPY 0x01 without 0x20) to block
- Pass insideWMO flag to all collision callers, match swim sweep to ground
- Widen swept hit detection radius from 0.15 to 0.25
- Restrict camera zoom to 12 units inside WMO interiors
- Fix /unstuck launching player above WMOs: remove +20 fallback, use
  gravity when no floor found
- Slash and Enter keys always focus chat unless already typing

src/ui/game_screen.cpp

@@ -1367,16 +1367,16 @@ void GameScreen::processTargetInput(game::GameHandler& gameHandler) {
 
     }
 
-    // Slash key: focus chat input
-    if (!io.WantCaptureKeyboard && input.isKeyJustPressed(SDL_SCANCODE_SLASH)) {
+    // Slash key: focus chat input — always works unless already typing in chat
+    if (!chatInputActive && input.isKeyJustPressed(SDL_SCANCODE_SLASH)) {
         refocusChatInput = true;
         chatInputBuffer[0] = '/';
         chatInputBuffer[1] = '\0';
         chatInputMoveCursorToEnd = true;
     }
 
-    // Enter key: focus chat input (empty)
-    if (!io.WantCaptureKeyboard && input.isKeyJustPressed(SDL_SCANCODE_RETURN)) {
+    // Enter key: focus chat input (empty) — always works unless already typing
+    if (!chatInputActive && input.isKeyJustPressed(SDL_SCANCODE_RETURN)) {
         refocusChatInput = true;
     }