chore(release): open dev at 2.78.0 before releasing 2.77.0

[github-actions]

Summary

2.77.0 is about to be released. Merging this first means dev already outranks the new tag when it lands, so neither dev nor any open pull request ever inherits the version-line failure. release.yml refuses to publish until this has merged.

This moves dev to 2.78.0 in package.json and the desktop version
sources (tauri.conf.json, Cargo.toml, and the opencodex-desktop entry of Cargo.lock).

Opened automatically by .github/workflows/dev-version-bump.yml. The same
version-line move was previously done by hand in 32529c2, e4a85d1, 076ad30, and
befcac3.

Verification

The workflow proved 2.77.0 has neither a Git tag nor an npm publication, and bun test tests/ci-workflows/release-version-line.test.ts proved the chosen development version is unused.

Checklist

• Scope stays focused and avoids unrelated cleanup.
• Docs or release notes were updated when needed.
• Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.

Review readiness checklist

This PR stays in draft until every box below is ticked. Tick all four boxes once the requirements are met:

• Required local validation passed; commands, results, and any full-suite exception are documented.

• I pushed my PR to a recent dev commit (at most 10 behind; a maintainer may still ask for the exact tip before merge).

• I resolved all correct Codex and CodeRabbit findings.

• My PR is ready for review.

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[github-actions]

⏳ DRAFT

• review readiness checklist open (0/4 boxes ticked).

What to do

• Tick all four boxes in the PR description once you're done (currently 0/4).

Review readiness checklist

• ⬜ Required local validation passed; commands, results, and any full-suite exception are documented.
• ⬜ I pushed my PR to a recent dev commit (at most 10 behind; a maintainer may still ask for the exact tip before merge).
• ⬜ I resolved all correct Codex and CodeRabbit findings.
• ⬜ My PR is ready for review.

0/4 boxes ticked.

Automatic draft conversion failed. Please convert this pull request to a draft manually until every box above is ticked.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-04T02:05:33.430888Z	099bca1	Draft marked ready

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[lidge-jun]

Maintainer integration into dev under the 2026-09-06 policy in MAINTAINERS.md, as part of the owner-authorized 2.77.0 release.

• Head 099bca164392539b7327550e21dbba13d946254c: only the four version sources move 2.77.0 -> 2.78.0 (reviewed).
• Exact-head checks: Cross-platform CI 37168755903 success, Service lifecycle 37168755971 success, enforce-target 37168889038 success after review and maintainer-sponsored.
• Release candidate 0818ea1812 (all-CI run 37162399902, success) is unchanged by this PR; it is promoted separately through [WRONG BRANCH] release: 2.77.0 #6550.