Show autocomplete suggestions for File Query Filters on Obsidian App

[samhoooo]

Closes #1025

Show autocomplete suggestions for File Query Filters on Obsidian App

Changes

• When you type in search modal, and matches the pattern file:, you should see list of all files in vault and non-vault
• This list is filtered down as you type more letters

Technical Details

• Added file filter mode (isFileFilterMode state) to filter search results by specific files
• Updated getSuggestions() function to search file from vault and non-vault via khoj backend.
• Updated the selection behavior to handle both file selection and search result selection

Testing

• Test deleting user messages
• Test deleting Khoj responses
• Verify both messages in a turn are removed
• Verify deletion persists after page refresh
• Verify no delete button on setup hint
• Verify no delete button on error message
• Verify no delete button on conversation starter
• Test error cases (network failure, etc)

Screensort

demo.mov