feat(tasks): add optional "none" priority level for tasks without urgency

New tasks default to "none" priority instead of "medium". Tasks with no
priority hide the badge in list and dashboard views, reducing visual noise
for routine items. Includes DB migration v4 and i18n keys (de, en, it).

Closes #15

CHANGELOG.md

@@ -7,6 +7,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.9.0] - 2026-04-04
+
+### Added
+- Optional task priority: new "None" level allows tasks without urgency, reducing visual noise for routine tasks (#15)
+- "None" is now the default priority for new tasks
+- Tasks with no priority hide the priority badge entirely in list and dashboard views
+- DB migration v4 extends priority CHECK constraint to include 'none'
+- i18n keys for "None" priority in de, en, it locales
+
 ## [0.8.2] - 2026-04-04
 
 ### Fixed