[feat] Quick Open UX/Discoverability improvement

[abose]

Describe the problem

Several features of quick open like @ to go to symbol, : to goto line number are not discoverable. We should address the UX to be very simple and stick to convention in chrome dev tools/vscode- BUT address the ux to not be able to remeber lotta commands.

Also open files should be default, not go to function in code, as users can typically press ctrl-f to search within file which they will most often do. So another default for more or less the same function need not be done.

Current view

The quick open dialog doesnt give any hint as to weather find symbol/goto line is supported currently.

Describe the solution you'd like

Have a drop down to help discoverability.

change placeholder message

Open File, @symbol or :line…

Dropdown for visual operation for people who prefer mouse

Alternatives considered

No response

Additional context

No response