feat: use date-based release versions

[h4yfans]

What

Add date-based public release tags and visible app versions for desktop releases.

Why

Stable releases should publish from main with public versions like v2026-05-06, with .2, .3, etc. for additional UTC-day releases, while Electron/updater internals keep semver-safe versions.

How

• Extend desktop release metadata allocation to reuse current HEAD tags and allocate same-day suffixes.
• Update the main release workflow to create/reuse release tags from main and publish public v-date release metadata/assets while preserving updater metadata versions.
• Add a display formatter so Settings and update dialogs show public v-date versions.

Type

• feat - new feature
• fix - bug fix
• refactor - restructure without behavior change
• style - visual/UI only
• perf - performance improvement
• test - adding or updating tests
• chore - tooling, deps, config
• ci - CI/CD changes

Test plan

• Unit tests added/updated
• Integration tests added/updated
• Manual testing (describe below)

Passed:

• pnpm lint
• pnpm typecheck
• node --test scripts/desktop-release-metadata.test.mjs
• pnpm --dir apps/desktop exec vitest run --config config/vitest.config.ts --project main src/main/lib/app-version-display.test.ts
• pnpm --dir apps/desktop exec vitest run --config config/vitest.config.ts --project renderer src/renderer/src/pages/settings/general-section.i18n.test.tsx
• git diff --check
• Normal pre-push hook on retry: contract checks, architecture checks, lint, IPC check, typecheck, and desktop test suite (410 passed | 1 skipped, 7399 passed | 1 skipped)

Notes:

• Initial full pnpm test hit a local better-sqlite3 native module mismatch; fixed locally with bash apps/desktop/scripts/ensure-native.sh node.
• One push attempt hit two test timeouts in the pre-push hook (src/main/index.phase2.test.ts, src/renderer/src/pages/settings/settings-page.i18n.test.tsx). Both passed in isolation immediately after, and the normal pre-push hook passed on retry.

Screenshots

N/A

Checklist

• Self-reviewed the diff
• No hardcoded secrets or credentials
• Files stay under ~500 LOC
• Follows immutable data patterns

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