feat(i18n): improve Spanish dashboard translation and add Spanish locale to desktop app

[Chytzo]

Summary

Improves the existing Spanish translation of the Hermes web dashboard and adds full Spanish (es) locale support to the Hermes Desktop app.

Changes

Dashboard (web/src/i18n/es.ts)

• Corrected awkward, incomplete, or untranslated strings throughout the Spanish locale
• Improved consistency and natural phrasing across all dashboard sections (sessions, cron, kanban, settings)
• Preserved the recently added scheduled Kanban keys that were introduced after the original PR

Desktop App (apps/desktop/src/i18n/)

• New es.ts file: Complete Spanish translation of all 1904 translatable strings in the desktop application
• Registration: Added es locale to the type system (types.ts), translation catalog (catalog.ts), and locale picker (languages.ts)
• Locale aliases: Added es, es-es, es-mx, es-ar mappings for automatic browser/language detection

Validation

• TypeScript compilation: tsc --noEmit passes with zero errors
• Translation key parity: all keys from the English source are present in the Spanish file
• The existing scheduled Kanban translations are preserved (addressing feedback from PR Improve Spanish dashboard translation #28070)

Context

This PR supersedes the earlier PR #28070, incorporating the maintainer feedback to rebase against current main.

[teknium1]

Thanks for extending Spanish support across the dashboard and Desktop.

Problems

• apps/desktop/src/i18n/es.ts:5 is a complete Translations object, but current main now requires common.expand, common.formatJson, and common.tryHint (apps/desktop/src/i18n/types.ts:73-88). PR head 4094997 contains none of those keys, so it cannot typecheck against current main.
• The alias additions in apps/desktop/src/i18n/languages.ts have no corresponding update to apps/desktop/src/i18n/languages.test.ts; the existing suite covers alias normalization, support detection, exact IDs, and persisted values at lines 5-42.

Suggested changes

• Rebuild the Spanish catalog against the current Translations contract, then run the Desktop typecheck.
• Add coverage for the new Spanish aliases and persisted locale value.
• Reconcile the dashboard wording independently during salvage; the branch is 3,522 commits behind current main from merge-base 5f6be7f31bd7.

This is an automated hermes-sweeper review.

[teknium1]

This strict Translations object is stale against current main: common.expand, common.formatJson, and common.tryHint are now required by apps/desktop/src/i18n/types.ts:73-88, but are absent from this catalog. Please regenerate/reconcile the catalog from current main before typechecking.