v1.1: Add New Band button and FIR quality selector

- New Band button in header bar for adding EQ nodes
- FIR latency dropdown: 4096 (~46ms), 8192 (~93ms), 16384 (~186ms)
- Version bump to 1.1

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.22)
-project(InstaLPEQ VERSION 1.0.0)
+project(InstaLPEQ VERSION 1.1.0)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)