codeSplitters: feed's today / 7 days / 30 days toggle wraps into a 2x2 box #629

On #/feed, the span toggle in the header (apps/codesplitters/src/client.html:3096, #feed-span) wraps: "today" and "7 days" on one row, "30 days" alone underneath, in a lopsided box. Seen by the owner while testing #609.

Fix:

• keep it on one line (white-space: nowrap on .seg, and let the header shrink the title instead)
• shorter labels: 1d · 7d · 30d, with the full words ("today", "last 7 days", "last 30 days") as title / aria-label
• check the other .seg toggles and header controls for the same wrap at desktop and phone widths

Owner's taste, for this and similar spots: self-explanatory icons or short labels over words that wrap, and an icon only when its meaning is obvious. See also #628 (framework logos instead of words).

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