feat: tooltip redesign and full project report README

[cheangie]

Summary

Two changes in this PR: a full redesign of the match breakdown tooltip, and a complete project report added to the README.

Tooltip redesign

Replaces the single bar chart MatchTooltip with a horizontal two-column panel that exposes the full score derivation chain from the backend.

• Left column shows the final score prominently at the top with "refined by neural network scoring" subtitle, then breaks down the three LinearScorer components (Content, IMDb, Popularity) with their weights and raw values, and a linear total at the bottom so the math is visible
• Right column shows the four TF-IDF field similarity bars (Description, Genres, Cast, Director) with color-coded fills
• Makes clear why the badge % and the linear total differ — the final score is the neural network-adjusted output, while the linear total (content × 0.75 + imdb × 0.20 + popularity × 0.05) shows the raw weighted sum

README report

Adds a full CS 4100 project report to README.md covering all required sections.

• Problem statement framing StreamCompass as a content-based filtering problem
• AI techniques — all 7 pipeline stages with math (TF-IDF, UCS, Bayesian scoring, linear regression, logistic regression, neural network, MDP)
• System design — data pipeline merge strategy and API layer
• Parameter choices and tuning table
• Testing and evaluation with qualitative query results and edge cases
• Limitations and lessons learned
• Connection to CS 4100 concepts table

Files changed

File	Description
frontend/src/App.jsx	Replaced MatchTooltip with horizontal two-column redesign
README.md	Added full project report sections

[LavishSphere]

I fixed the README outdated parts, it looks good now.