feat(dashboard): local-time greeting + timezone-drift banner

Greeting
- The "Good morning / afternoon / evening, Matt" line now derives from the
  browser's local time, computed inside a useEffect so the rendered HTML
  can't lock to the server's clock during hydration. Until the effect
  fires, the header reads "Welcome" — a neutral phrase that's correct at
  every hour and never produces a hydration warning. The phrase re-evaluates
  hourly so a rep leaving the dashboard open across a boundary (5am, noon,
  6pm) doesn't keep stale text on screen.

Timezone-drift banner
- New <TimezoneDriftBanner> on the dashboard surfaces when the browser's
  resolved timezone (Intl.DateTimeFormat().resolvedOptions().timeZone, which
  follows the OS — and the OS usually follows physical location) doesn't
  match the user's stored CRM preference. The rep gets a one-tap "Update to
  Tokyo" button and a dismiss × that's sticky per browser via localStorage.
- Why a banner rather than auto-update: the stored timezone drives reminder
  firing time, daily-digest delivery, and due-date rendering. Silently
  pinning it to a transient travel location would shift their reminder
  schedule underfoot. The banner gives them control.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/berths/berth-detail-header.tsx

@@ -368,7 +368,10 @@ function InterestLinkPicker({
           <ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" />
         </Button>
       </PopoverTrigger>
-      <PopoverContent className="w-[var(--radix-popper-anchor-width)] min-w-[320px] p-0" align="start">
+      <PopoverContent
+        className="w-[var(--radix-popper-anchor-width)] min-w-[320px] p-0"
+        align="start"
+      >
         <Command>
           <CommandInput placeholder="Search prospects…" />
           <CommandList>
@@ -415,7 +418,9 @@ function InterestLinkPicker({
                   >
                     {stageLabel(opt.pipelineStage)}
                   </span>
-                  {value === opt.id ? <Check className="h-3.5 w-3.5 text-muted-foreground" /> : null}
+                  {value === opt.id ? (
+                    <Check className="h-3.5 w-3.5 text-muted-foreground" />
+                  ) : null}
                 </CommandItem>
               ))}
             </CommandGroup>