feat(home): remove CATEGORIES breakdown card (#107)

[ryota-murakami]

Summary

Removes the CATEGORIES breakdown card from the home screen. The card listed each category with a count and a week-over-week percentage trend (↑ 200%, ↓ 100%, new). Those up/down deltas frame the week as a score against last week — a comparison/performance lens DESIGN.md's north star explicitly avoids (self-affirmation, never KPI guilt or comparison). A ↓ 100% on a category you simply didn't touch reads as "you fell off." Removing it keeps the home screen quiet.

Closes #107.

Changes

• Remove <CategoryFilterChips /> from TodoList's right column + its import
• Delete CategoryFilterChips.tsx (sole consumer)
• Delete aggregate-category-trends.ts + its test (only used by the card)

Acceptance criteria

• Home no longer shows the CATEGORIES card (names, counts, ↑/↓ trends gone)
• No leftover gap/heading/broken spacing — card was a child of a space-y-6 column; the heading lived inside the card, so removal is structurally clean
• Rest of home + every other screen keeps rendering (typecheck, lint, build, 654 unit tests green)
• Nothing left stuck in a filtered/partial state — selectedCategoryId is shared localStorage state still driven by the sidebar Category.tsx; the todo list query is unchanged. Losing the card's tap-to-filter shortcut is accepted per the issue.

QA

• ✅ pnpm typecheck, pnpm lint, pnpm build, full unit suite (654 passed / 33 skipped) green locally (CI node 24.13.0)
• ⏳ Web E2E is CI-only on this machine → CI run is the gate (exercises authenticated /home + category specs)

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Removed the category breakdown section from the home screen, resulting in a simpler layout.
  • The rest of the home screen content and behavior remain unchanged.

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Project	Deployment	Actions	Updated (UTC)
corelive	Ready	Preview, Comment	Jun 24, 2026 3:47pm

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.89%. Comparing base (888a5b1) to head (cd9ec31).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #114      +/-   ##
==========================================
- Coverage   67.18%   66.89%   -0.29%     
==========================================
  Files         138      137       -1     
  Lines        4376     4335      -41     
  Branches     1195     1182      -13     
==========================================
- Hits         2940     2900      -40     
  Misses       1218     1218              
+ Partials      218      217       -1     

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 02024e1a-3863-4621-a6a3-bcf4a79dcd46

📥 Commits

Reviewing files that changed from the base of the PR and between 42747b5 and 5eb3a96.

📒 Files selected for processing (4)

• src/app/(main)/home/_components/CategoryFilterChips.tsx
• src/app/(main)/home/_components/TodoList.tsx
• src/lib/aggregate-category-trends.test.ts
• src/lib/aggregate-category-trends.ts

💤 Files with no reviewable changes (4)

• src/lib/aggregate-category-trends.test.ts
• src/app/(main)/home/_components/CategoryFilterChips.tsx
• src/lib/aggregate-category-trends.ts
• src/app/(main)/home/_components/TodoList.tsx

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📝 Walkthrough

Walkthrough

Removes the "Categories" breakdown card from the home screen. The CategoryFilterChips component (322 lines), the aggregateCategoryTrends library (211 lines) with its types, and the associated test file (235 lines) are all deleted. The import and render block are removed from TodoList.tsx.

Changes

CategoryFilterChips removal

Layer / File(s)	Summary
Remove CategoryFilterChips from TodoList src/app/(main)/home/_components/TodoList.tsx	Removes the CategoryFilterChips import and its render block; SundayDigestCard now follows WeeklySummaryCard directly with no gap.
Delete component, library, and tests src/app/(main)/home/_components/CategoryFilterChips.tsx, src/lib/aggregate-category-trends.ts, src/lib/aggregate-category-trends.test.ts	Deletes the 322-line chip/select component, the 211-line aggregateCategoryTrends function with CategoryTrend/CategoryTrendEntry types, and the 235-line Vitest suite covering all trend-calculation and sorting cases.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐇 Hop hop, the trend card is gone from the screen,
No more ↓ 100% to make weekdays feel mean.
The chips have been swept and the dropdown's away,
A calmer home screen greets each passing day.
Just quiet affirmation — the rabbit's preferred way! 🌿

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly states the home screen CATEGORIES card is being removed and matches the main change.
Linked Issues check	✅ Passed	The removal of the CATEGORIES card, helper, and render block satisfies the linked issue's requirements.
Out of Scope Changes check	✅ Passed	The diff stays focused on deleting the card and its support code, with no unrelated changes apparent.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/107-remove-categories-card

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