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Add 4 example circuits accessible from a new toolbar dropdown: - SR Flip-Flop (NOR) — basic set-reset latch - SR Flip-Flop (NAND) — active-low variant - D Latch (1-bit Memory) — gated latch with enable - D Flip-Flop (Master-Slave) — edge-triggered with CLK Each example shows name + description in the dropdown and loads the full circuit with proper gate placement and wiring. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>