This is a good start. Left some comments. Not sure why Module 0 changes are in this PR

Progress since last round is real (formula, Manhattan row, concepts naming, intro line all fixed), but several items from my previous reviews are still open, so requesting changes again.

Still open from my last reviews:

1. Module 0 files are still in this PR. Please remove course/beginners/_index.md and the module-0/ files so this PR only adds module 1; those shared files belong to #2492. Same request going out on every module PR.
2. Line 202: - and more... Cut it or name a real use case.
3. Lines 213–226: reference links. Href the text itself: [Qdrant Concepts](https://qdrant.tech/documentation/concepts/), drop the link-beside-text pattern for all four.
4. Title Case on headings throughout: "Today's Path", "Core Limitation", "What You'll Learn", and so on.
5. Syllabus still says "Hybrid Search: Dense + Sparse + Filters" in _index.md. Same point I made on the module body: filters aren't a hybrid-search component. "Dense + Sparse". (Moves to #2492 once the shared files come out of this PR.)

New items:
6. Line 141 is a broken sentence: "A score of 0.0 means on the other hand can be interpreted as…". Suggest: "A score of 1.0 means the vectors point in the same direction. A score near 0.0 means the texts are semantically unrelated." Also drop "(identical meaning)"; cosine 1.0 is same direction, not identical meaning.
7. Line 149: "around 0.847". Did you run this? Three decimals plus "around" don't mix, and the score depends on the model version. Run it and quote the real number, or say "around 0.85".
8. Line 83 table row is mislabeled and the example is broken: typo tolerance is fuzzy matching, not "keyword matching", and "(receive → receive)" is the same word twice. → "Fuzzy matching | Tolerance for typos (recieve → receive)".
9. Line 71: SPLADE doesn't belong in the pre-semantic evolution list. It's a learned sparse model that came after dense retrieval. Drop it here; it's covered properly in Module 3. (This answers my earlier chronology question: no, it wasn't chronological.)
10. Diagrams are off-brand. The colors aren't from the Qdrant color palette and the shapes aren't from our diagram system. Rebuild them from the Docs/Diagrams Figma component library using the Qdrant palette.
11. No exercise. The module is all reading. Add one small task: embed three query/document pairs with the section 4 snippet and compare cosine scores.
12. "Best of both worlds" (line 211) → say what it does: "Covers both exact terms and intent".
13. _index.md: "vector databases" → "vector search engines" (hard rule), and "Duration: Multiple modules" is vague, this course has 6. The Path and syllabus should list all six modules.

Noting for launch, not blocking: the module video placeholder at the top will need the real video before the course goes live.

Must fix (blocks shipping)

• No video at the top of the module page. Every course module page needs one — see the Essentials course pages for the embed pattern. Outro bumper yes, Intro bumper no.
• Diagrams are off-brand. In cosine-similarity.png (and the pattern holds across the set): colors are outside the Qdrant palette (olive/dark yellow labels, non-ramp greens), and headings are set in mono instead of Mona Sans. Please rebuild from the Docs/Diagrams Figma library (https://www.figma.com/design/dlnrdaJ6pGlKyXoZquVhtZ/Docs---Diagrams?node-id=8137-14624) using palette tokens (Violet 50 #8547FF, Teal 50 #038585, P50 #DC244C, neutrals), Mona Sans headings, and Geist Mono values.
• Dead/outdated doc links. The docs were restructured; these targets no longer exist: /documentation/concepts/ and #distance-metrics, /documentation/concepts/filtering/, and qdrant.tech/rag. Use: filtering → /documentation/search/filtering/, RAG → an existing article such as /articles/what-is-rag-in-ai/. Also use relative paths (/documentation/...), not absolute https://qdrant.tech/..., matching the rest of the repo.
• Hand-rolled next button. The closing <a> with inline styles (background:#dc244c) is off-system and targets /course/beginners/module-2/, which 404s until #2495 merges. Drop it and rely on the course layout's built-in next navigation (the content.nextButton/nextDay frontmatter pattern Essentials uses).
• Broken markdown: 3. **TF-IDF / BM25 — unclosed bold, renders as literal asterisks.

Should fix

• Unmeasured numbers presented as measurements. "yields a similarity score around 0.85" for "car repair" vs. "automobile maintenance" on all-MiniLM-L6-v2 is asserted, not measured (expect meaningfully lower). Same question for the diagram's 0.96 / 0.62 / -0.28. Run the snippet in the lesson, use the actual printed scores in both prose and diagram. Also: the text says "a score near 0.0 means unrelated" while the diagram shows -0.28 — add one sentence that cosine can go negative.
• Nonsense table row. Apple stock | fruit company disambiguation? | ❌ Missed — the middle cell isn't a document, and polysemy is a wrong-match failure, not a miss. Suggest: document = "apple harvest season guide", result = "wrong sense matched".
• Vague closing paragraph in §4. "Vector embeddings aren't limited by these models, however. They are theoretically capable of capturing any data into a transformed structured format." says nothing concrete. Suggest: "Embeddings aren't text-only: the same idea works for images, audio, and code, which is how multimodal search in Module 4 works."
• Style sweep. Spaced hyphens used as em-dash substitutes throughout ("no matter how closely related the meaning is", "Recency, popularity, personalization - payload values…") — replace with commas, colons, or two sentences. Heading case: "Today's Path" here vs. "Today's path" in Modules 0/2 and Essentials — match Essentials. Several images have label-only alt text ("Cheap Flights Example") — write descriptive alt text.

Nice to have

• "(see Module 4)" appears twice — fine if Module 4's scope is locked, otherwise soften to "later in this course".
• The PR description says images will be added soon, but they're already in the diff — please update it to reflect the actual state.