fix: three CI-caught bugs — AxisColor, SensorRegistry, stdint.h

1. DashboardTheme: add missing AxisColor field (derived from
   ToolbarFontColor). Used by 6 widgets but never defined — caused
   "Unrecognized field name AxisColor" in MATLAB CI.

2. example_dashboard_advanced: register sensors in SensorRegistry
   before DashboardEngine.load() so fromStruct can resolve sensor keys.

3. mksqlite.c: add #include <stdint.h> for uint32_t — MATLAB's mex
   compiler on Linux CI doesn't implicitly include it like GCC does.

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

Author: HanSur94

examples/example_dashboard_advanced.m

@@ -275,13 +275,21 @@
 d.save(jsonPath);
 fprintf('\nSaved to: %s\n', jsonPath);
 
+% Register sensors so fromStruct can resolve them during load
+SensorRegistry.register('T-401', sTemp);
+SensorRegistry.register('P-201', sPress);
+SensorRegistry.register('F-301', sFlow);
+
 % Load back — multi-page layout, InfoFile, and widget properties all preserved
 d2 = DashboardEngine.load(jsonPath);
 fprintf('Reloaded: %d widget(s), %d page(s), InfoFile="%s"\n', ...
     numel(d2.Widgets), numel(d2.Pages), d2.InfoFile);
 assert(numel(d2.Pages) == 2, 'Expected 2 pages after reload');
 
-% Clean up temp file
+% Clean up
+SensorRegistry.unregister('T-401');
+SensorRegistry.unregister('P-201');
+SensorRegistry.unregister('F-301');
 delete(jsonPath);
 fprintf('Temp file cleaned up.\n');
 

libs/Dashboard/DashboardTheme.m

@@ -117,6 +117,11 @@
             d.GridLineColor       = [0.82 0.82 0.82];
     end
 
+    % Axis label/tick color — derive from toolbar font (readable on widget bg)
+    if ~isfield(d, 'AxisColor')
+        d.AxisColor = d.ToolbarFontColor;
+    end
+
     % Shared defaults across all presets
     d.WidgetBorderWidth    = 1;
     d.HeaderFontSize       = 14;

libs/FastSense/mksqlite.c

@@ -21,6 +21,7 @@
 #include "sqlite3.h"
 #include <string.h>
 #include <stdlib.h>
+#include <stdint.h>
 
 /* ---- Constants ---- */
 #define MAX_DBS 16