docs: file Empty Trash as item 118, point 103 at its spec

Item 103's measurement is done, so its section carries the finding and the
three constraints that decide whether to open the spec, rather than the
design inline.

Item 118 is blocked on 103 and is the first action that would destroy mail
with no undo, which is why it is filed separately rather than folded in.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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