Release v0.4.0

[lRoccoon]

Summary

• Bump package.json to 0.4.0 to tag the release that bundles the share feature merged in Share via transfer.sh with configurable endpoint #4 plus the Source-panel layout fix.

Highlights since v0.3.0

• Share via transfer.sh — new toolbar entry uploads the current source to a transfer.sh-compatible endpoint and produces a …#share=<url> link that auto-loads the shared JSON when opened in another tab. Endpoint is configurable in the share popover (default https://t.herf.cc) and persisted in localStorage.
• Loading overlay — centered spinner + "正在加载分享内容…" while a shared payload is being fetched; textarea goes read-only during the fetch.
• Toolbar layout fix — share/history triggers moved into the 01 Source label row so the toolbar no longer wraps on 13" laptops; popovers right-align to stay inside the panel.

Test plan

• pnpm build succeeds.
• pnpm test green (history + jsonUtils suites).
• Real-environment upload to https://t.herf.cc (server requires --cors-domains "*"); generated link auto-loads in a new tab.
• Loading overlay verified with a delayed mock; failure path renders ✦ 分享加载失败 · … in the panel footer.
• Source toolbar fits on a single row at 1280×800.

Post-merge

• Tag v0.4.0 on main and push (triggers the multi-arch image push to ghcr.io/lroccoon/json-tool).
• Cut a GitHub Release referencing this PR.

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