to reduce load time &white space

[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

Gate Dart protobuf code generation behind the "dart" feature flag and add logging to indicate when generation runs or is skipped

Enhancements:

• Wrap Dart codegen calls in cfg(feature="dart") blocks to avoid unconditional generation
• Add println messages for both enabled and disabled Dart feature cases in the build script

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR refactors the build script to gate Dart protobuf code generation behind a Cargo feature flag and adds logging to inform users whether code generation runs or is skipped.

File-Level Changes

Change	Details	Files
Gate Dart code generation behind the "dart" feature flag	Wrapped the protobuf code generation call in a #[cfg(feature = "dart")] block Added a #[cfg(not(feature = "dart"))] block to skip code generation when the feature is disabled	frontend/rust-lib/dart-ffi/build.rs
Introduce console logging for generation status	Print a message when Dart protobuf code is being generated Print a message when Dart feature is not enabled to indicate skipping	frontend/rust-lib/dart-ffi/build.rs

Possibly linked issues

• #unknown: The PR modifies Dart protobuf generation with conditional logic, directly addressing the issue of protobufs not being generated.
• #the issue: The PR fixes the issue by ensuring Dart protobuf files are generated when the 'dart' feature is enabled, resolving missing file and type errors.

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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/dart-ffi/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:** Redundant code: duplicate Dart code generation under feature flag.

Remove the first call to `dart_gen` under the `dart` feature flag to eliminate duplication.
</issue_to_address>

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[sourcery-ai]

issue: Redundant code: duplicate Dart code generation under feature flag.

Remove the first call to dart_gen under the dart feature flag to eliminate duplication.