feat(ui): collapsible Tools, shared AccordionList helper

The flat 10-item Tools list grew crowded, so tools are now grouped into
collapsible sections (Location / Comms / System) that fold in place — the
same model as Settings.

Extracted that fold-in-place behaviour into a reusable AccordionList helper
(owns the collapse mask, flattened visible-row list, selection and scroll;
host supplies section sizes + two row painters) and migrated SettingsScreen
onto it, dropping its hand-rolled buildVis/visIndexOf/sectionIndex and five
state fields. AccordionList joins drawList/DigitEditor/NavView as a shared
UI element used by two screens.

Added four mini-icons (bot, note, chart, gear) so every Tools row and
section header carries a glyph.

Builds verified: WioTrackerL1 + e-ink solo (Flash 61.0%).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

examples/companion_radio/ui-new/UITask.cpp

@@ -1373,6 +1373,7 @@ void UITask::gotoSettingsScreen() {
 }
 
 void UITask::gotoToolsScreen() {
+  ((ToolsScreen*)tools_screen)->enter();
   setCurrScreen(tools_screen);
 }