Add inline controller remap modal and descriptor-based bindings

- Expand `Alt+C` from controller selection to config/remap UI with learn, clear, and reset flows
- Persist full controller binding descriptors through IPC/config (buttons, axes, directions, D-pad fallback)
- Update runtime/tests/docs/config examples for new binding schema; keep `Alt+Shift+C` debug modal

src/config/definitions/template-sections.ts

@@ -38,7 +38,7 @@ const CORE_TEMPLATE_SECTIONS: ConfigTemplateSection[] = [
     title: 'Controller Support',
     description: [
       'Gamepad support for the visible overlay while keyboard-only mode is active.',
-      'Use the selection modal to save a preferred controller by id for future launches.',
+      'Use Alt+C to pick a preferred controller and remap actions inline with learn mode.',
       'Trigger input mode can be auto, digital-only, or analog-thresholded depending on the controller.',
       'Override controller.buttonIndices when your pad reports non-standard raw button numbers.',
     ],