triac
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SSR leakage current is flowing through switched load when SSR is OFF. It has nothing to do with input of SSR.
Follow the article.
Datashet for BC547B contains data for Icb0. Roughly, Ice0=Icb0*Hfe. That parameters are changing with temperature and consider worst case.
If the transistor leakage current is smaller than 2mA you do not need bleeder resistor.
That resistor is not a bleeder. A "bleeder" resistor is fitted across the terminals of a high voltage capacitor, so its stored charges can be bled away, leaving the capacitor safely discharged.
Connect a bleeder resistor as in the figure above and set the bleeder resistance value so that the Solid-state Relay input voltage is 0.5 V max. when the Solid-state Relay is OFF.[/I][/B]
Unless you can measure the leakage current, you just have to experiment - maybe start with 2k2 and work your way down.