feat(app): add "Send with Ctrl+Enter" option

[alexyaroshuk]

What does this PR do?

closes #11898
Adds a new setting that allows users to send messages using Ctrl+Enter (or Cmd+Enter on Mac) instead of the default Enter key. When enabled, Enter inserts a newline and Ctrl+Enter sends the message.

Default is off (Enter sends, Shift+Enter adds newline).

How did you verify your code works?

1. bun test
2. manual test

Files changed

Files Changed	Description
packages/app/src/context/settings.tsx	Added sendWithModEnter boolean to general settings
packages/app/src/components/settings-general.tsx	Added Input section with toggle switch
packages/app/src/components/prompt-input.tsx	Added keybind handling for Ctrl+Enter
packages/app/src/i18n/*.ts (16 files)	Added localization keys for new setting

[philipmat]

I would very much like to see this merged in as well, please.

[alexyaroshuk]

@adamdotdevin could you give this one a look?

[alexchandel]

Does this setting still allow mobile web users to send a message via the Send button?

There is currently no practical way for mobile users to type a newline on the web UI. The "Return" key always results in the partially formed message being immediately sent, even with Shift+Enter.

[alexyaroshuk]

Does this setting still allow mobile web users to send a message via the Send button?

There is currently no practical way for mobile users to type a newline on the web UI. The "Return" key always results in the partially formed message being immediately sent, even with Shift+Enter.

currently unable to test this

[ualtinok]

This would be great addition. I hope can be merged soon. I don't know how many times I sent the prompt prematurely and cancel/reverted.

Thanks!