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>

cli/src/models.rs

@@ -105,7 +105,7 @@ pub async fn stream(
         mc.effort = Some(e);
     }
     let max_tokens = mc.max_output.unwrap_or(16_000);
-    let req = ChatRequest { model: mc, system, messages, tools, max_tokens, reasoning: true };
+    let req = ChatRequest { model: mc, system, messages, tools, max_tokens, reasoning: true, session_id: Some(session.to_string()) };
     provider.stream(req, tx, cancel).await
 }