Update build.rs

[ShekFarman]

Feature Preview

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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.

Summary by Sourcery

Enhance the build script to log Dart protobuf code generation and to skip generation when the dart feature is disabled

Enhancements:

• Add println statements in build.rs to indicate when Dart protobuf code generation starts
• Print a message and skip code generation if the dart feature is not enabled

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Enhance build.rs by wrapping Dart protobuf code generation in explicit feature-gated blocks with informative logging for both enabled and disabled states.

Flow diagram for updated build.rs feature gating and logging

flowchart TD
    A["Start build.rs"] --> B{"Is 'dart' feature enabled?"}
    B -- Yes --> C["Print: Generating Dart protobuf code for package"]
    C --> D["Call dart_gen with package name"]
    B -- No --> E["Print: Dart feature not enabled; skipping code generation."]
    D --> F["End"]
    E --> F

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File-Level Changes

Change	Details	Files
Add structured conditional blocks and logging around Dart code generation	Wrapped dart_gen invocation in a feature-gated block Added println! before code generation when Dart feature is enabled Introduced a cfg(not(feature = "dart")) branch with skip message	frontend/rust-lib/flowy-error/build.rs

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[sourcery-ai]

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

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location> `frontend/rust-lib/flowy-error/build.rs:2-3` </location>
<code_context>
 fn main() {
   #[cfg(feature = "dart")]
   flowy_codegen::protobuf_file::dart_gen(env!("CARGO_PKG_NAME"));
+    #[cfg(feature = "dart")]
+    {
</code_context>

<issue_to_address>
**issue:** Duplicate code generation call under the 'dart' feature.

There are two calls to 'dart_gen' under the 'dart' feature; please remove the duplicate to prevent confusion or double execution.
</issue_to_address>

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[sourcery-ai]

issue: Duplicate code generation call under the 'dart' feature.

There are two calls to 'dart_gen' under the 'dart' feature; please remove the duplicate to prevent confusion or double execution.

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