The Insights page's range group gains a calendar picker: one panel that
takes BOTH ends, in either order. A backwards pick — end before start —
is sorted on the second click, so `orderedDayRange` hands every reader
downstream (the scope window, the ledger-day predicate, the chip that
names it) a pair with `from <= to`; `dayRangeWindow` orders it again at
the seam, so a hand-built pair can never filter the page to nothing.
The trigger IS the scope: one pill carrying the start and the end, fed
the LIVE window — a picked range when one owns the scope, the preset's
own window read as days otherwise, so "last 30 days" prints the thirty
days it covers and the two controls can never disagree. Only a picked
range takes the chip's brand voice and grows the way back, and the panel
keeps no second copy of the two dates: the chip above it is already
showing them, live, while the pick runs.
Underneath, the range model moves from a start-only floor to a two-sided
`RangeWindow`, which closes the top of a picked scope: the ledger-day
predicate gains the ceiling it never had, so a day beyond the range no
longer leaks into the skill card, and both picked days count whole
(midnight through the last millisecond). `days.ts` gains the calendar
arithmetic this needs — a day's epoch bounds, its weekday, month
stepping, and one month laid out as Sunday-first weeks — with the
round-trip key validation its siblings already used.
The panel portals to `<body>` and seats itself off its trigger's rect,
the containment escape the page's hover tips already take: the page is
the `lc-ov` query container, so an in-tree popover would be both
captured and clipped by the one scroller. It measures itself before
paint, clamps inside the viewport, flips above the trigger when it would
fall off the bottom, and retracts on any scroll, resize, outside press,
or Escape.
Closes#128
bowenliang123
6051e39180