* fix: address review findings
* fix: improve error handling in terminal e2e helper JSON parsing
* fix: remove unused catch parameter in terminal e2e helper
* fix: use nullish coalescing assignment for LANG default in PTY spawn
The object spread approach ({LANG: default, ...process.env}) produced
undefined on CI (Ubuntu/Node 22) despite working locally. Switch to
explicit ??= assignment after the spread for reliable cross-platform
behavior.
Move build resources to resources/build/, icon source files to
resources/icon-source/, scripts to config/scripts/, and patches
to config/patches/ for a cleaner top-level directory layout.
