Remove Paste Button

[smk762]

Closes #72 (issue migrated from wallet repo)

This PR removes the paste button in recipient address field UI and rather relying on the system's native paste functionality. This change makes the UI cleaner, safer and less likely to cause concern from security popups.

Changes

UI/UX Improvements

• Removed explicit paste button from the recipient address field
• Simplified state management by removing _showPasteButton tracking
• Removed unnecessary setState calls in various methods
• Users can still paste using standard system paste functionality (Ctrl+V/Cmd+V or right-click menu)

Code Cleanup

• Removed _pasteFromClipboard method as it's no longer needed
• Removed state updates related to paste button visibility

QA Test Plan

Basic Functionality

1. Open any withdrawal screen with the recipient address field
2. Verify the field accepts text input normally
3. Verify address validation still works as expected
4. Verify the clear button (X) appears when text is entered and clears the field when clicked

Paste Functionality

1. Copy a valid address to clipboard
2. Test pasting using:
   • Keyboard shortcut (Ctrl+V/Cmd+V)
   • Right-click context menu
   • Mobile long-press paste option
3. Verify the pasted address is validated correctly

QR Code Scanner

1. Click the QR code scanner button
2. Scan a valid address QR code
3. Verify the address is populated in the field
4. Verify validation occurs after scanning

Visual Verification

1. Check that the field looks clean without the paste button
2. Verify all states display correctly:
   • Empty state
   • Focus state
   • Valid address state (with checkmark)
   • Invalid address state (with error message)
   • Loading state during validation

Edge Cases

1. Test with very long addresses
2. Test with invalid addresses
3. Test rapid input/paste operations
4. Test with empty clipboard
5. Verify no UI glitches when switching between states

@CharlVS To simplify testing, a CI build in the wallet repo would be appreciated.

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