~anthropic/claude-sonnet-latest → A (8:1)

Side A is a small, focused fix that removes duplicate/dead UI code (the toolbar + ExpandNewThreadForm action) and unifies the new-thread compose flow, directly simplifying the codebase with tests updated accordingly. Side B is a large, unfocused commit ('nice') that deletes a legacy parser file while duplicating nearly the same 1800-line reddit-URL parser under new module names (parser.rs, parser_action.rs) and bolts on an unrelated, seemingly experimental 'parser-panel' navigation demo feature, adding bulk and complexity without clear lasting value or coherent purpose.