Apply website QA: light theme, clearer contact form, office emails

- Add a light theme with a header toggle; the choice is remembered and applied before paint
- Make the globe, product visuals and footer logo follow the theme
- Give the message field a full outline, strengthen the captcha box border and keep autofilled fields readable
- Accept website addresses without https://
- List the info email under every office
- Keep the phone header on one row: languages move into the menu below 480px

src/content/pages/en/contact.json

@@ -128,7 +128,7 @@
           "subtitle": "Partner Office",
           "body": [
             "A US point of contact for businesses across Texas and beyond.",
-            "Downtown Houston, TX, USA\nPhone: +1 832-350-0465"
+            "Downtown Houston, TX, USA\nPhone: +1 832-350-0465\nEmail: info@aigrowthtechnologies.com"
           ],
           "list": [],
           "cta": null
@@ -139,7 +139,7 @@
           "subtitle": "Partner Office",
           "body": [
             "A US point of contact based in South Florida.",
-            "Brickell Avenue, FL, USA\nPhone: +1 954-235-4974"
+            "Brickell Avenue, FL, USA\nPhone: +1 954-235-4974\nEmail: info@aigrowthtechnologies.com"
           ],
           "list": [],
           "cta": null
@@ -150,7 +150,7 @@
           "subtitle": "Partner Office",
           "body": [
             "A US point of contact in one of the world’s leading business markets.",
-            "Manhattan Financial District, NY, USA\nPhone: +1 713-289-4577"
+            "Manhattan Financial District, NY, USA\nPhone: +1 713-289-4577\nEmail: info@aigrowthtechnologies.com"
           ],
           "list": [],
           "cta": null