Rename Wrystr to Vega

Named after Jurij Vega (1754-1802), Slovenian mathematician who made
knowledge accessible through his logarithm tables. Rebrand before
OpenSats application (April 1).

- Product name, window title, identifiers, binary name all renamed
- Cargo package: wrystr -> vega, wrystr_lib -> vega_lib
- PKGBUILD: wrystr -> vega (new AUR package name)
- Release workflow: artifact names, release text updated
- README: new tagline referencing Jurij Vega
- DB migration: auto-renames wrystr.db -> vega.db on first launch
- Keyring service name kept as "wrystr" for backward compatibility
- localStorage keys kept as wrystr_* to preserve existing user data

Pending manual steps:
- Rename GitHub repo hoornet/wrystr -> hoornet/vega
- Create new AUR package vega-git, orphan wrystr-git
- Update local .desktop launcher

src-tauri/src/lib.rs

@@ -9,6 +9,7 @@ use tauri::{
 
 // ── OS keychain ─────────────────────────────────────────────────────────────
 
+// Keep legacy keyring service name so existing users don't lose their keys
 const KEYRING_SERVICE: &str = "wrystr";
 
 #[tauri::command]
@@ -43,7 +44,13 @@ struct DbState(Mutex<Connection>);
 
 fn open_db(data_dir: std::path::PathBuf) -> rusqlite::Result<Connection> {
     std::fs::create_dir_all(&data_dir).ok();
-    let path = data_dir.join("wrystr.db");
+    // Try new name first, fall back to legacy name for migration
+    let new_path = data_dir.join("vega.db");
+    let legacy_path = data_dir.join("wrystr.db");
+    if !new_path.exists() && legacy_path.exists() {
+        std::fs::rename(&legacy_path, &new_path).ok();
+    }
+    let path = new_path;
     let conn = Connection::open(path)?;
     conn.execute_batch(
         "PRAGMA journal_mode=WAL;
@@ -385,7 +392,7 @@ pub fn run() {
             app.manage(DbState(Mutex::new(conn)));
 
             // ── System tray ──────────────────────────────────────────────────
-            let show_item = MenuItem::with_id(app, "show", "Open Wrystr", true, None::<&str>)?;
+            let show_item = MenuItem::with_id(app, "show", "Open Vega", true, None::<&str>)?;
             let quit_item = MenuItem::with_id(app, "quit", "Quit", true, None::<&str>)?;
             let menu = Menu::with_items(app, &[&show_item, &quit_item])?;
 

src-tauri/src/main.rs

@@ -7,5 +7,5 @@ fn main() {
     #[cfg(target_os = "linux")]
     std::env::set_var("WEBKIT_DISABLE_DMABUF_RENDERER", "1");
 
-    wrystr_lib::run()
+    vega_lib::run()
 }