Bumps the desktop version from 0.0.11 to 0.0.12, so Sparkle offers a new canary built from current `main` (c30845d). Nate asked for this release.

Included since 0.0.11: - #109 (#107): Issues/PRs rows. Title links and "Open on GitHub" open in the browser; "Open in a channel" creates a channel in the selected project and asks the agent. The desktop app now opens http(s) new-window links in the default browser (native side, `apps/desktop/src/index.ts`). Validation is in #109. - #104 (#91): images pasted into the composer are attached. This was already merged to `main` before this release.

Validation: `bun types` and `bun run ci` pass on this lane. Once this merges, the signed **Desktop release** workflow builds the exact merge commit, notarizes the app and DMG, and verifies the public download bytes before publishing the signed canary feed.

### Built in Ace

An Ace channel (github-rows-canary) did all Git and GitHub work, checks, the release dispatch and verification, through its shell tool. Codex supervised by driving the Ace Canary UI; it made no edits and ran no commands. Workaround: the `lane` tool created the lane from the project checkout's stale `feat/github-cache` HEAD, so the agent reset the lane to `origin/main` (#96). No desktop input, clipboard or fixture apps were used for this release.