Show amounts for OP_RETURN outputs

[Jacksper13]

Summary

• show the formatted output amount alongside every OP_RETURN message during transaction review
• render user-controlled OP_RETURN text literally by escaping LVGL recolor delimiters
• add simulator regression coverage for zero-value, nonzero-value, forged-markup, and normal address outputs

Root cause

render_output() calculated the output value before classifying the destination, but its OP_RETURN branch returned early without including that value in the trusted-display text. The same branch inserted the decoded OP_RETURN message into a recolor-enabled label without escaping # delimiters, allowing message text to be interpreted as highlighted UI markup.

Impact

Users can review the full economic value of an OP_RETURN output before signing. OP_RETURN messages can no longer create highlighted text that resembles trusted Amount or Destination rows. These changes affect display formatting only; PSBT parsing, fee calculation, and signing behavior are unchanged.

Validation

• palette-independent renderer regression script exercised with color and monochrome highlight values
• python -m pycodestyle for the changed Python files
• git diff --check