Module block 

Functions

handle_create_block 🔒

Phase E.3 — create a block inside a tab. Validates parent tab exists; otherwise emits Event::Error (non-fatal). On success: assigns a UUID, appends to the tab’s block_ids, inserts into state.blocks, emits Event::BlockCreated.

handle_delete_block 🔒

Phase E.3 — delete a block from a tab. Idempotent: deleting a missing tab or missing block is a silent no-op.

handle_move_block 🔒

Phase E.5.5 — move a block from src_tab_id to dst_tab_id at dst_index (clamped). Updates block.tab_id. Cross-tab moves AND intra-tab repositioning both go through this command (the caller specifies the destination index regardless).

handle_update_block_meta 🔒

Phase E.5.3 — pass-through for block meta updates. Same shape.