chore(release): todo-v0.3.0

Build 3.

Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/todo/halkyon_todo_flutter/assets/whats_new/0.3.0.en.txt

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+- Reminders arrive on the minute, and Todo asks to notify as soon as there is one.
+- Today: a Calendar layout, with tasks dragged from its Plan onto an hour.
+- Add task highlights dates as you type, keeps a word as text with Backspace, and dictates.
+- Add project is a screen of its own, with sub-projects and favourites.
+- Sub-tasks open in their task's sheet.
+- A time picked for a date is kept, and editing a project keeps its Display.
+- Settings: choose the appearance and language.