v0.7.9

What's Changed

• backend: harden request validation for planning routes by @Vhivi in #189
• backend: remove OS locale dependency for weekday labels by @Vhivi in #190
• frontend: centralize API base URL and harden request handling by @Vhivi in #191
• frontend: improve planning table reliability and add year-boundary regression test by @Vhivi in #192

Full Changelog: v0.7.8...v0.7.9