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>

config.example.toml

@@ -246,8 +246,15 @@ base_url = "https://fal.run"
 api_key = "${FAL_KEY}"
 default_model = "fal-ai/flux/schnell"
 output_dir = "generated"
+# The agent drafts with a "preview" model, asks which draft to refine, then
+# creates the final image with the best "final" model for the purpose
+# (good_for: photo, illustration, text, design), passing the draft as reference
+# to models with reference_param. The models below have these values built in;
+# set stage / good_for / reference_param / price to override or for other models.
 models = [
-  { id = "fal-ai/flux/schnell", name = "FLUX.1 schnell – fast", price = 0.003 },
+  { id = "fal-ai/flux/schnell", name = "FLUX.1 schnell – fast previews", price = 0.003 },
+  { id = "fal-ai/nano-banana-pro/edit", name = "Nano Banana Pro – refine an image", price = 0.15 },
+  { id = "fal-ai/nano-banana-pro", name = "Nano Banana Pro", price = 0.15 },
   { id = "fal-ai/flux-2-pro", name = "FLUX.2 pro" },
   { id = "fal-ai/ideogram/v3", name = "Ideogram 3 – text in images", size_param = "aspect_ratio" },
   { id = "fal-ai/recraft/v4/pro/text-to-image", name = "Recraft V4 pro – design" },