Four fixes around the dispatch header following dispatcher feedback:
1. **⋯ overflow menu was invisible**: .sb-header had `overflow:hidden`,
which clipped the absolutely-positioned dropdown right at the
header's bottom edge. Switched the header to `overflow:visible`
(children all have flex-shrink:0 + a flex:1 center, so the layout
doesn't actually overflow horizontally). Bumped z-index to 5000
for safety on top of map/calendar layers.
2. **NLP/Assistant IA bar hidden by default**: was eagerly rendering
on every page load, with the long French placeholder polluting
the header below the toolbar. The user just wanted the icon. Now
`nlpVisible` defaults to false, persisted in localStorage so power
users who flip it on keep it open across sessions. Toggle still
lives in the ⋯ menu.
3. **Click a tech in the resource list now flies the map to them**:
selectTechOnBoard previously only opened the map panel. Now it
also `map.flyTo({ center })` using `tech.gpsCoords ?? tech.coords`
— live Traccar position wins when the tech is online; falls back
to the saved home base. Animated, deferred a tick so map.resize()
happens first, otherwise flyTo can land on garbage coords during
the panel's open transition.
4. **Board view tabs collapsed into a "Vue principale ▾" dropdown**:
was [Vue principale][Par région][+] inline. Now a single button
showing the active view; click reveals the others + the future
"+ Nouvelle vue" entry. Same dropdown component as the ⋯ menu
(shared CSS, click-outside + ESC close).
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