Fix for #8200: add PLN (Polish Złoty) number format support

[julianengel]

This PR adds support for PLN (Polish Złoty) as a number format option in the database fields.

• Add PLN = 37 to NumberFormatPB enum in Rust
• Add conversion mappings between NumberFormat::PLN and NumberFormatPB::PLN
• Add "Polish złoty" title and "zł" symbol in Flutter UI

Note: This requires corresponding NumberFormat::PLN to be added in the collab-database dependency (AppFlowy-Collab repository).

Changes needed in collab-database:

In the NumberFormat enum (likely in a file similar to fields/number_type_option.rs), add: PLN = 37,

Feature Preview

This addresses the following issue: #8200

However, a change to collab-database is required for it to be a fix.

Also, this may need to be adjusted for https://github.com/AppFlowy-IO/AppFlowy-Web

PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing - they will be once it's added to collab-database

Summary by Sourcery

Add support for the Polish złoty (PLN) number format by extending the Rust NumberFormatPB enum with conversion mappings and updating the Flutter UI with the corresponding label and symbol.

New Features:

• Introduce PLN variant to NumberFormatPB enum and mapping in Rust
• Display "Polish złoty" title and "zł" symbol for PLN in the Flutter UI

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Implements Polish Złoty support by extending the Rust data model with a new PLN variant and bidirectional enum conversions, and updating the Flutter UI to display the correct PLN label and symbol.

File-Level Changes

Change	Details	Files
Add PLN support in Rust data layer	Add PLN = 37 variant to NumberFormatPB enum Map NumberFormat::PLN to NumberFormatPB::PLN in From impl Map NumberFormatPB::PLN to NumberFormat::PLN in From impl	frontend/rust-lib/flowy-database2/src/entities/type_option_entities/number_entities.rs
Add PLN label and symbol in Flutter UI	Add case returning "Polish złoty" for PLN in title extension Add case returning "zł" for PLN in symbol extension	frontend/appflowy_flutter/lib/plugins/database/application/field/type_option/number_format_bloc.dart

Possibly linked issues

• [FR] Add Polish Złoty PLN support as currency #8200: The PR adds PLN (Polish Złoty) number format support, directly implementing the feature requested in the issue.

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[CLAassistant]

All committers have signed the CLA.

[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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