When route-refresh capability is negotiated between two BGP peers , "clear ip bgp *" will not trigger a hard-reset at all. Is it right to say that hard reset never happens with router with route-refresh capabilities ?
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No, that command will trigger a hard-reset of all peerings.
Negotiating route-refresh means you can perform a soft-reset using, for example clear ip bgp * soft - doing so requires negotiating route-refresh OR soft-reconfiguration inbound
Note that soft-reconfiguration inbound is a waste of RAM and should generally be avoided if route-refresh capability is available - the only exceptions are where the time/bandwidth consumption is considered more important.
If you want to be able to trigger a hard reset without loss of forwarding, look at BGP graceful-restart
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