feat(examples): import robot_desktop — ESP32 animated-eyes face

Pulls https://github.com/davidmonterocrespo24/robot_desktop into the
examples gallery as a real-world ESP32 + sensors project. Cozmo-style
desktop robot: SSD1306 OLED face that blinks, looks around, and shows
emotions; DHT11 weather mode triggered after 10 min idle; PIR wakeup
from sleep; LDR-driven sleep when the room goes dark; sound-triggered
reactions; and two eyebrow servos.

Ships as 34 separate files (one .ino + 33 headers / source) rather
than the usual single-sketch flatten. The face engine
(Eye / EyeTransition / EyeVariation / FaceBehavior / FaceExpression
/ FaceEmotions / BlinkAssistant / LookAssistant / …) splits
responsibility across enough classes that flattening would obscure
the design. Velxio's multi-file `files: [{ name, content }]`
mechanism handles this cleanly — the editor mounts the .ino as the
active sketch and the rest sit in the same workspace.

Pre-placed components match the original board's pin map verbatim
from Common.h:

  - SSD1306 OLED on I²C (SDA=21, SCL=22 — ESP32 default)
  - DHT11 on GPIO 15
  - PIR motion on GPIO 4
  - Big sound sensor on GPIO 2
  - Photoresistor on GPIO 34 (ADC1)
  - Right eyebrow servo on GPIO 12
  - Left eyebrow servo on GPIO 13

Arduino libraries (U8g2lib, DHT, ESP32Servo, Adafruit_Sensor) are
auto-installed by velxio's Library Manager on the first compile.

Category 'displays', difficulty 'advanced', tags cover both the
sensor list and the project's identity (cozmo / robot / animation /
eyes) so the gallery search surfaces it from multiple angles.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/data/examples.ts

@@ -11,6 +11,7 @@ import { hundredDaysExamples } from './examples-100-days';
 import { picowWifiExamples } from './examples-picow-wifi';
 import { epaperExamples } from './examples-displays-epaper';
 import { retroIntelExamples } from './examples-retro-intel';
+import { robotDesktopExamples } from './examples-robot-desktop';
 
 /** Per-board setup for multi-board examples */
 export interface ExampleBoard {
@@ -7652,6 +7653,7 @@ export const exampleProjects: ExampleProject[] = [
   ...picowWifiExamples,
   ...epaperExamples,
   ...retroIntelExamples,
+  ...robotDesktopExamples,
 ];
 
 // Get examples by category