fix: auto-save scratchpad notes and use nerd font note icon

- Fix scratchpad not saving when closing with Esc or window leave
- Update note icon to use nerd font icon (󱞁)
- Ensure notes are preserved when users expect them to be saved

Nested task with folding

Per-project TODOs

new project structure

new project structure

server feature, to-do timestamps, new window configuration and minor …

…improvements

server feature

prioritization editing

scratch pad syntax highlighting

new scratch pad feature and in-progress status