Home on a phone: nothing between the composer and the first post #851

A follow-up to #813 (home is the feed), from its review: on a phone, the "What you asked for" link and the missing-model-key banner pushed the first post down.

• "What you asked for" is a third tab on a phone (Feed | Your apps | Asked); the desk keeps the small link above the timeline.
• The crew's missing-key note moves to the rail: beside the timeline on a desk, after it on a phone. It is the owner's to fix, not the first thing above every post.

Test: test/home-feed.test.ts checks the note comes after the timeline and the tabs carry /asked. Local: home-feed, studio, everyday, the five cross files and feed-page, 279 pass; tsc clean.

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