feat: add visual feedback when files are added to context via drag-drop

[xleandrobr]

• Created ContextFeedbackBanner component for success/info feedback

• Added contextFeedback translations (EN and PT-BR)

• Integrated feedback into ChatTextArea handleDrop

When users drag files into the chat (holding Shift), a green success

banner now confirms the files were added to context.

Closes #84 (improves UX for file drag-drop)

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[kevinvandijk]

Thanks @xleandrobr. I will test this soon!