improve input

[HenryTSZ]

• ArrowLeft: move the cursor left
• ArrowRight: move the cursor right
• Enter: submit

before submit:

• Space: move to the next word ant select it
• Shift + ArrowRight: move to the next word and select it
• Backspace: move to the previous word and select it (if current word is empty)
• Shift + ArrowLeft: move to the previous word and select it

after submit:

• Space: move to the next error word ant select it (if next error word exists)
• Shift + ArrowRight: move to the next error word and select it (if next error word exists)
• Backspace: move to the previous error word and select it (if current word is empty and previous error word exists)
• Shift + ArrowLeft: move to the previous error word and select it (if previous error word exists)

[HenryTSZ]

https://github.com/cuixiaorui/earthworm/assets/55341525/54b4654b-e9f5-4c75-ad73-745817707434