Fix navbar alignment and validation loss lines

Deploy: Prepare codebase for Hugging Face Spaces

feat: add SFT sections and charts

refactor: inline summarizer settings and remove sidebar

feat: add HellaChart for Hellaswag accuracy visualization

feat: refine LossChart with val_loss, proper scaling, and markers

refactor: update log parser to group metrics by step

feat: dark mode toggle and button contrasts

fix: use mermaid.render to prevent react dom conflict

fix: mermaid diagram re-render and error handling

feat: add MermaidDiagram component

feat: add interactive LossChart component

feat: redesign summarizer page

fix: Reddit URL validation and parsing

feat: reddit fetcher integration

fix: address code review comments for settings sidebar

feat: inference settings sidebar

feat: base layout and routing setup