feat: stabilize test suite and add UIDrawable methods

- Add visible, opacity properties to all UI classes (#87, #88)
- Add get_bounds(), move(), resize() methods to UIDrawable (#89, #98)
- Create UIDrawable_methods.h with template implementations
- Fix test termination issues - all tests now exit properly
- Fix test_sprite_texture_swap.py click handler signature
- Fix test_drawable_base.py segfault in headless mode
- Convert audio objects to pointers for cleanup (OpenAL warning persists)
- Remove debug print statements from UICaption
- Special handling for UIEntity to delegate drawable methods to sprite

All test files are now "airtight" - they complete successfully,
terminate on their own, and handle edge cases properly.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/run_all_tests.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+# Run all tests and check for failures
+
+TESTS=(
+    "test_click_init.py"
+    "test_drawable_base.py" 
+    "test_frame_children.py"
+    "test_sprite_texture_swap.py"
+    "test_timer_object.py"
+    "test_timer_object_fixed.py"
+)
+
+echo "Running all tests..."
+echo "===================="
+
+failed=0
+passed=0
+
+for test in "${TESTS[@]}"; do
+    echo -n "Running $test... "
+    if timeout 5 ./mcrogueface --headless --exec ../tests/$test > /tmp/test_output.txt 2>&1; then
+        if grep -q "FAIL\|✗" /tmp/test_output.txt; then
+            echo "FAILED"
+            echo "Output:"
+            cat /tmp/test_output.txt | grep -E "✗|FAIL|Error|error" | head -10
+            ((failed++))
+        else
+            echo "PASSED"
+            ((passed++))
+        fi
+    else
+        echo "TIMEOUT/CRASH"
+        ((failed++))
+    fi
+done
+
+echo "===================="
+echo "Total: $((passed + failed)) tests"
+echo "Passed: $passed"
+echo "Failed: $failed"
+
+exit $failed