fix(street-level): fit the whole photo on phones

At phone width the right rail is the band between mid-screen and the credit
line, so a 16:10 viewer plus its bar and caption was cut off. Below 720 px
the viewer's height is derived from that band (clamped 110-320 px); floating
and expanded viewers reset to auto height. The QA harness checks the photo
and caption fit at 390x844, and CURRENT-STATE documents the docking rules
and phone sizing.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

docs/CURRENT-STATE.md

@@ -2796,8 +2796,12 @@ the settings follow. SINCE is a stepped range input (any date, 10, 5, 3, 2 and
 1 years, 6, 3 and 1 months) whose readout names the cut-off date. The panel is
 portable (`street-level-panel` spec in `PanelPositionControls`, minimum
 320 × 280, `dockOnCollapse`): in a resized window the viewer takes the spare
-height and only `.sl-settings` scrolls, and collapsing the window or SHRINK
-after EXPAND docks it at its default size.
+height and only `.sl-settings` scrolls, and a user's collapse, a header
+double-click or SHRINK after EXPAND docks it at its default size (cockpit
+entry, restores and the Cyber accordion never dock a floating window). At
+phone width (≤720 px) the rail is the band between mid-screen and the credit
+line, so the viewer's height is derived from that band instead of 16:10 and
+the whole photo and caption fit without scrolling.
 
 Street-level providers implement the contract documented in
 `src/layers/streetLevel/registry.js`: a definition (`id`, `name`, `label`,