Require double-backspace to delete tags

[trek-e]

Summary

• Fixes Hitting backspace inside the Tag text field deletes tags #69
• Previously, pressing backspace when the tag input field was empty would immediately delete the last tag
• This was unexpected for users who accidentally pressed backspace

Changes

Now requires two backspaces:

1. First backspace highlights the last tag (50% opacity)
2. Second backspace deletes it

The highlight is cleared if the user:

• Starts typing
• Clicks elsewhere (loses focus)
• Tags change through other means

Test plan

• Add multiple tags to an item
• With cursor in empty tag field, press backspace once — last tag should dim
• Press backspace again — tag should be deleted
• Repeat but type text after first backspace — highlight should clear
• Repeat but click elsewhere after first backspace — highlight should clear

🤖 Generated with Claude Code