feat/ adds country field type detection with locale-based candidate

[Najma099]

What

Adds country as a new form field type to FORM_FIELD_PATTERNS.

How

• Matches fields with names/ids containing: country, country_code,
  nation, nationality, country_name
• Detects the user's country locally from navigator.language
  (e.g. "en-IN" → "India") using Intl.DisplayNames
• Uses try/catch consistent with the existing timezone block
  which uses the same Intl API
• No API call needed — fully local detection

Example

User with navigator.language = "en-IN" focusing a name="country"
field will see "India" suggested with confidence 0.85

[Najma099]

@Shantanugupta43 , can you please review the code and let me know if any changes are required?

[Shantanugupta43]

Yep will do give me few days apologies for the delay got few urgent responsibilities