refactor: apply CLAUDE.md code quality improvements and add packaging

- Add #![forbid(unsafe_code)] to main.rs (issue #3)
- Replace raw ANSI escape codes with owo-colors crate (issue #2)
- Replace manual HOME path construction with dirs::home_dir() (issue #5)
- Ship umutray.service as a static file; service::install() substitutes
  the binary path at install time instead of generating the unit at runtime
- Add packaging/PKGBUILD following Arch Rust package guidelines
- Add CLAUDE.md tracking refactor tasks
- setup.rs: clean up downloaded temp files on abort/back, save launcher
  to config only after successful install, auto-start download when a
  preset has an installer_url
- util.rs: add pick_folder() using zenity/kdialog subprocesses (no rfd)
- config.rs: populate installer_url for all 6 built-in presets with
  official download URLs
- Document the Option<Option<Vec<String>>> gamescope pattern at main.rs:307

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/config.rs

@@ -1,5 +1,6 @@
 use anyhow::{Context, Result};
 use directories::ProjectDirs;
+use owo_colors::OwoColorize;
 use serde::{Deserialize, Serialize};
 use std::path::PathBuf;
 
@@ -86,9 +87,7 @@ pub struct Config {
 }
 
 fn home_dir() -> PathBuf {
-    std::env::var("HOME")
-        .map(PathBuf::from)
-        .expect("$HOME is not set; cannot determine default paths")
+    dirs::home_dir().expect("Cannot determine home directory")
 }
 
 fn default_compat_dir() -> PathBuf {
@@ -128,7 +127,9 @@ pub fn presets() -> Vec<Launcher> {
             ),
             gameid: "umu-battlenet".into(),
             process_pattern: r"Battle\.net".into(),
-            installer_url: None,
+            installer_url: Some(
+                "https://www.battle.net/download/getInstallerForGame?os=win&gameProgram=BATTLENET_APP&version=Live".into(),
+            ),
             proton_version: None,
             games: vec![],
         },
@@ -141,7 +142,9 @@ pub fn presets() -> Vec<Launcher> {
             ),
             gameid: "umu-eaapp".into(),
             process_pattern: r"EADesktop\.exe".into(),
-            installer_url: None,
+            installer_url: Some(
+                "https://origin-a.akamaihd.net/EA-Desktop-Client-Download/installer-releases/EAappInstaller.exe".into(),
+            ),
             proton_version: None,
             games: vec![],
         },
@@ -154,7 +157,9 @@ pub fn presets() -> Vec<Launcher> {
             ),
             gameid: "umu-epicgameslauncher".into(),
             process_pattern: r"EpicGamesLauncher\.exe".into(),
-            installer_url: None,
+            installer_url: Some(
+                "https://launcher-public-service-prod06.ol.epicgames.com/launcher/api/installer/download/EpicGamesLauncherInstaller.msi".into(),
+            ),
             proton_version: None,
             games: vec![],
         },
@@ -167,7 +172,9 @@ pub fn presets() -> Vec<Launcher> {
             ),
             gameid: "umu-uplay".into(),
             process_pattern: r"UbisoftConnect\.exe|upc\.exe".into(),
-            installer_url: None,
+            installer_url: Some(
+                "https://ubistatic3-a.akamaihd.net/orbit/launcher_installer/UbisoftConnectInstaller.exe".into(),
+            ),
             proton_version: None,
             games: vec![],
         },
@@ -180,7 +187,9 @@ pub fn presets() -> Vec<Launcher> {
             ),
             gameid: "umu-gog".into(),
             process_pattern: r"GalaxyClient\.exe".into(),
-            installer_url: None,
+            installer_url: Some(
+                "https://webinstallers.gog-statics.com/download/GOG_Galaxy_2.0.exe".into(),
+            ),
             proton_version: None,
             games: vec![],
         },
@@ -193,7 +202,9 @@ pub fn presets() -> Vec<Launcher> {
             ),
             gameid: "umu-rockstar".into(),
             process_pattern: r"Rockstar Games.*Launcher\.exe".into(),
-            installer_url: None,
+            installer_url: Some(
+                "https://gamedownloads.rockstargames.com/public/installer/Rockstar-Games-Launcher.exe".into(),
+            ),
             proton_version: None,
             games: vec![],
         },
@@ -320,7 +331,7 @@ impl Config {
             games: vec![],
         });
         self.save()?;
-        println!("\x1b[1;32m✓\x1b[0m Added launcher '{name}'.");
+        println!("{} Added launcher '{name}'.", "✓".green().bold());
         Ok(())
     }
 
@@ -354,7 +365,7 @@ impl Config {
             gamescope,
         });
         self.save()?;
-        println!("\x1b[1;32m✓\x1b[0m Added game '{name}' under launcher '{launcher}'.");
+        println!("{} Added game '{name}' under launcher '{launcher}'.", "✓".green().bold());
         Ok(())
     }
 
@@ -370,7 +381,7 @@ impl Config {
             anyhow::bail!("launcher '{launcher}' has no game named '{name}'");
         }
         self.save()?;
-        println!("\x1b[1;32m✓\x1b[0m Removed game '{name}' from '{launcher}'.");
+        println!("{} Removed game '{name}' from '{launcher}'.", "✓".green().bold());
         Ok(())
     }
 
@@ -408,7 +419,7 @@ impl Config {
             g.gamescope = v;
         }
         self.save()?;
-        println!("\x1b[1;32m✓\x1b[0m Updated flags for '{launcher}/{name}'.");
+        println!("{} Updated flags for '{launcher}/{name}'.", "✓".green().bold());
         Ok(())
     }
 
@@ -420,8 +431,8 @@ impl Config {
         }
         self.save()?;
         println!(
-            "\x1b[1;32m✓\x1b[0m Removed '{name}'. \
-             The Wine prefix on disk was left untouched."
+            "{} Removed '{name}'. The Wine prefix on disk was left untouched.",
+            "✓".green().bold()
         );
         Ok(())
     }
@@ -443,7 +454,7 @@ impl Config {
             self.proton_compat_dir = d;
         }
         self.save()?;
-        println!("\x1b[1;32m✓\x1b[0m Config saved.");
+        println!("{} Config saved.", "✓".green().bold());
         println!();
         self.show()
     }