fix: cap electron-builder pnpm collector depth to unblock CI release builds

[julia-kafarska]

Summary

Fixes the multi-platform desktop release build in CI. electron-builder's pnpm
node-module collector runs pnpm list --prod --json --depth Infinity, and on
this workspace the cloud-SDK dependency graph makes that dump so large the
collector exhausts memory on the release runners. Cap the list depth via a
pnpm patch and give the parse enough heap.

Closes #

What changed

• Added patches/app-builder-lib@26.8.1.patch, registered under
  pnpm.patchedDependencies: the pnpm node-module collector now calls
  pnpm list with --depth 6 instead of --depth Infinity.
• .github/workflows/release.yml: set NODE_OPTIONS=--max-old-space-size=8192
  on the electron-builder step so parsing the (still large) list output has
  headroom on the hosted runners.
• pnpm-lock.yaml: records the patched dependency.

How I tested

• Local packaged build: compared the collected module set at depth 6
  against depth Infinity — identical app contents (no missing prod deps).
• Iterated on the release workflow against real CI runners via a
  temporary debug workflow (since removed); the release build completes
  with this patch where it previously OOM'd.

Notes for reviewers

• Depth 6 is not arbitrary: the desktop app's deepest production dependency
  chain resolves within it — verified by diffing the collector's output
  against the full-depth run locally.