feat(schedule): due date editing, notes Save/Edit, and notes persistence fix

[romahawk]

Summary

• × button on due date chip — clears dueDate + time slot, moves task back to Unscheduled list
• Editable due date field — replaces the read-only chip with a <input type="date"> so the date can be changed directly in the panel; × button still unschedules
• Explicit Save/Edit flow for notes — textarea with a "Save notes" button (appears when text is entered); after saving, notes render read-only with an "Edit" button to re-enter edit mode
• Notes persistence fix — moved notes storage from TimeBlock.notes to Task.notes; updateTask was rebuilding the linked TimeBlock from scratch on every category/title/time change, silently wiping any saved notes

Root cause (notes wipe)

updateTask in the store reconstructs the linked TimeBlock at lines 1118–1131 with an explicit field list that never included notes. Any edit to category, description, due date, or times would overwrite the block — and notes — without warning. Task updates use { ...current, ...updates }, so fields absent from updates are always preserved.

Test plan

• Click a scheduled block → verify the Due date field is editable and changes persist
• Click × on the due date → verify panel closes and task appears in Unscheduled list
• Type notes → "Save notes" button appears → click it → notes render in read-only view
• Click "Edit" → textarea reopens with existing notes → edit and save again
• Switch to another block and back → verify notes are still there
• Change Category or Description after saving notes → switch away and back → verify notes survive

🤖 Generated with Claude Code

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