Add Web Push, guided start screen, SVG icons, chunked uploads, rename

- Web Push (VAPID + RFC 8291, pure Rust): permission/question/finished
  notifications while no app window is visible; settings with test button
- Guided new-session flow: task, craft target (website/app/game/old
  software/fresh), clean room or deep, description, model, folder
  (new, existing or cloned git repository); originals upload to original/
- Craft phase bar (craft_phase tool) for study/specify/build/check/ready
- Chunked uploads (8 MB) up to server.max_upload_mb (default 500 MB)
- All UI glyphs and emojis replaced by themeable SVG icons
- Rename dialog with manual name or model-generated suggestion

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

web/src/components/QueueList.tsx

@@ -1,3 +1,4 @@
+import { Icon } from "./Icon";
 import { del, post } from "../api";
 import { useT } from "../i18n";
 import { useStore } from "../store";
@@ -38,7 +39,7 @@ export function QueueList({ sessionId, busy }: { sessionId: string; busy: boolea
                 title={t("queue.remove")}
                 onClick={() => del(`/sessions/${sessionId}/queue/${it.id}`).catch((e) => toast(e.message))}
               >
-                ×
+                <Icon name="close" />
               </button>
             )}
           </div>