By Martin Baccardax Conagra said “higher-than-expected cost pressures” will continue to persist for the rest of the year, and plans to increase prices in order to mitigate their impact. Conagra Brands Inc (CAG) – Get Conagra Brands, Inc. Report shares slumped lower Thursday after the packaged food giant cut its full-year profit forecast amid surging input prices and freight costs. Conagra said profits for the three months ending in February, the group’s fiscal third quarter, slipped 1.7% from last year to 58 cents per share, while revenues rose 4.7% to $2.9 billion. While both tallies essentia…