fix(repositories): weight precision, paginated next-page, drop repo-name tooltip

[anderdc]

Summary

• formatWeight helper formats weight/share values up to 5 decimals and trims trailing zeros (so 0.00350 renders as 0.0035, not 0.04). Applied across the repositories table, leaderboard card, search results, watchlist row + bar chart, and the repository-details Stats panel. Tooltips and axis labels that surfaced Weight use it too.
• Fix useDataTableParams.setFilter so it only clears the page slot when the filter value actually changes. react-router-dom rebuilds setSearchParams on every URL change; that propagated through useCallback deps and re-fired DebouncedSearchInput's effect, which called setFilter('search', '') and wiped the page param immediately after next-page was clicked. Most visible in cards view with rows=12, but also caused deep links like ?page=N to reset on load.
• Remove the hover tooltip on the repository-name cell in the repositories table.

Test plan

• Repositories cards view, rows=12: click "next page" → URL updates to ?page=1 and rows "13–15 of 15" render (verified via Playwright against local dev server).
• Deep-link /repositories?page=1 keeps you on page 1.
• Typing in the repositories search still clears page (filter value actually changed).
• npx tsc -b and eslint clean.
• Eyeball weight column in cards/list views and on the watchlist for the expected display.
• Confirm repo-name cell no longer shows a tooltip on hover.