[sounak1125]

Split view could stretch images and bounce them upward after opening, while a renderer crash during a streamed save could leave the board locked until the app restarted. This fixes both: the canvas keeps its scale through the full transition, and abandoned save sessions release their handles and file reservations after active writes safely finish.

Prepares RefBoard 2.1.4 with matching app/installer versions, release notes, and an artifact verifier for packaged source, installer payload, and update-feed hashes. Updates three obsolete smoke-test assumptions around toolbar fades, WebContentsView targeting, and clipboard PNG encoding.

Validation:

• All 68 npm test commands passed.
• All 43 named smoke scripts passed (44 executions including GPU/software grid), plus packaged label and split tests.
• Real renderer crash/reload preserved the committed file byte-for-byte and allowed a same-path save retry.
• Root and bootstrapper dependency audits report zero known vulnerabilities.
• App and bootstrapper builds succeeded; installer UI launched; release artifacts and embedded payload hashes match.

Actual installation/upgrade, live auto-update, and dropping into another native application remain manual checks before publication. See docs/RELEASE_AUDIT.md. The release will remain a draft.