Status LEDs, image model selection, backup restore, provider test, monthly versions

- Sidebar: three status LEDs (server, models, MCP) with an overview popover (/api/status)
- Images: preview stage, purpose-based model choice and reference images
  (Nano Banana Pro edit refines the chosen preview)
- Settings: restore a stored or uploaded backup (staged, applied on restart)
- Provider form: test connection; saving or reloading re-checks the status at once
- opencode Zen/Go: send x-opencode-session with a stable id per conversation
- Releases are named vYYYYMM-NNNNN; scripts/release.sh numbers, tags, builds and publishes
- Fix: backups made in the same second no longer overwrite each other

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

server/src/update.rs

@@ -5,7 +5,7 @@ use serde_json::{Value, json};
 use std::sync::{Arc, Mutex};
 use std::time::Duration;
 
-pub const VERSION: &str = env!("CARGO_PKG_VERSION");
+pub use codecraft_core::version::VERSION;
 
 /// Git commit the image was built from (Docker build arg GIT_COMMIT).
 pub fn commit() -> &'static str {
@@ -17,10 +17,7 @@ pub struct UpdateState {
     pub latest: Mutex<Option<Value>>,
 }
 
-fn newer(a: &str, b: &str) -> bool {
-    let p = |v: &str| v.trim_start_matches('v').split(['.', '-']).take(3).map(|x| x.parse::<u64>().unwrap_or(0)).collect::<Vec<_>>();
-    p(a) > p(b)
-}
+use codecraft_core::version::newer;
 
 async fn check(app: &App) -> Option<Value> {
     let url = app.config().server.update_url.clone();
@@ -46,12 +43,4 @@ pub fn spawn_checker(app: Arc<App>) {
     });
 }
 
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn version_compare() {
-        assert!(super::newer("v0.2.0", "0.1.9"));
-        assert!(super::newer("1.0.0", "0.9.9"));
-        assert!(!super::newer("v0.1.0", "0.1.0"));
-    }
-}
+