webpage_generator: keep scanning->blocked silent (no scan-stopped warning)
A block is external and self-resolving, so the immediate "measurement stopped, confirm" warning chime was misleading there - the user cannot act on it and should just wait. Suppress startWarning when the destination status is blocked; the blocked track still handles it (silent until the 60-min blockedChime, then hourly). scanning->idle (success tone) and scanning->other (warning tone) are unchanged. Help text updated.
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