fix(hub): the show detail modal must not move when the season does

2026-09-02T07:49:41Z

The previous pass fixed the synopsis and the cast, and the dialog still jumped: the episode count moves things a fixed-height synopsis cannot reach. - The body scrolled as a whole, so a thirteen-episode season pushed the modal to its max-height where a six-episode one had not. `.video-overlay` centres its child, so the taller modal also *started higher up the screen* — title bar, close button and all. `.video-detail-steady` (a multi-season show only) gives the modal a height rather than a max-height, makes the body a flex column, and hands the leftover to the episode list as the one scrolling part. A constant-height box is centred in the same place every time, so both halves settle at once. - A scrolling season draws a scrollbar where a non-scrolling one draws none, which is a scrollbar's width of content and re-wrapped the file path above it, shifting everything below by a line. `scrollbar-gutter: stable`. - The season panel was clipped by the modal's own `overflow: hidden` whenever the seasons outran the room under the picker — at a 740px viewport it wanted 320px and had 288, and the rest sat where no scroll could reach it. It is `position: fixed` now, placed by `placeSeasonPanel()`, which takes the trigger's rect and the window height, picks whichever side has more room, and caps the panel to it. Scoped to multi-season shows throughout: a movie has no season to switch to and a fixed height would buy it nothing but empty space. test_video_detail_measured.py now builds each block inside a real `.video-overlay`, since the centring is half the defect, and asserts the modal top and height as well as the picker's offset — for a long and a short synopsis and for a six- and a twenty-four-episode season. test_season_panel_placement.py runs placeSeasonPanel() in node over a rect and a window height. Two guards are declarations rather than rectangles and say so in their docstrings: headless Chrome gives the probe zero-width overlay scrollbars, so the gutter cannot be measured there. Co-Authored-By: Claude Opus 5 Claude-Session: https://claude.ai/code/session_014UtzVrzM7e2tG9fSpkR9ML

meshbay.git/packages/meshbay-hub/tests/test_season_panel_placement.py, branch main

fix(hub): the show detail modal must not move when the season does