fix: remove duplicate package name in version output (dora-rs#1312)

Fixes the duplicate "dora-cli" text in the version output.

Clap automatically prepends the package name when displaying version
info, so we don't need to include it in our custom version string. This
was causing the output to show "dora-cli dora-cli 0.4.0".

Also added colons after package names for better readability.

Related to dora-rs#1307

Generated with [Claude Code](https://claude.ai/code)

Sorry

Author: phil-opp

binaries/cli/src/lib.rs

@@ -32,15 +32,15 @@ fn get_version_info() -> clap::builder::Str {
 fn build_version_string() -> String {
     let cli_version = env!("CARGO_PKG_VERSION");
 
-    let mut version_output = format!("dora-cli {}\n", cli_version);
+    let mut version_output = format!("{}\n", cli_version);
 
     // Add dora-message version
-    version_output.push_str(&format!("dora-message {}\n", dora_message::VERSION));
+    version_output.push_str(&format!("dora-message: {}\n", dora_message::VERSION));
 
     // Try to detect Python dora-rs version
     match get_python_dora_version() {
         Some(python_version) => {
-            version_output.push_str(&format!("dora-rs (Python) {}\n", python_version));
+            version_output.push_str(&format!("dora-rs (Python): {}\n", python_version));
 
             // Check for version mismatch
             if python_version != cli_version {
@@ -52,7 +52,7 @@ fn build_version_string() -> String {
             }
         }
         None => {
-            version_output.push_str("dora-rs (Python) not found\n");
+            version_output.push_str("dora-rs (Python): not found\n");
         }
     }