fix(web): integrate composer "working/queued" strip into the terminal aesthetic
The background-working hint was a plain muted text line bolted above the textarea — misaligned with the input column and off-idiom. Restyle it as a terminal status strip: spinner + uppercase fg "Working" label + muted detail, hairline primary-tinted border (matching .trace.running), square, aligned to the textarea's max-w-3xl column. Reads as part of the working state now. VERSION: 0.17.1 -> 0.17.2
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