Fix PR-metrics scoping and align UI consistency in Analytics page

[Ri1tik]

Addressed Issues:

Fixes #(issue number)
Problems:

• Issue dropdown was hardcoded to .slice(0, 12), capping visibility regardless of actual fetch.
• PR dropdown used model.totalRepos (unfiltered) regardless of PAT — showing many repos with zero PR data when no PAT was connected.
• Advanced Analytics had no loading state, and its empty-state copy was stale (typo in button name, and text describing issue bucketing instead of PR metrics).
• Both loading messages hardcoded "top 15 repositories" — not accurate to actual scoping (top 10/org or all repos/org).
• Clicking "Collect Advanced Metrics" after issues were already loaded caused the whole page to flicker (unmount/remount), since explore() cleared model/orgs synchronously and the page guards on if (!model) return null.

Screenshots/Recordings:

Before:

Recording:
https://github.com/user-attachments/assets/18e4cb73-c59d-4c2d-aa81-a812a70834d0

After:

Recording:
https://github.com/user-attachments/assets/29f44fea-3c9c-4e09-a212-ef2fa09be080

Additional Notes:

Fixes:

• Both dropdowns now derive from actually-fetched data, not the raw model.
• PR metrics now follow the same trigger flow as Governance: runAdvanceAnalytics checks isComplete, re-explores if still sample-scoped, else skips straight to fetching. runFullAnalytics runs issues + pulls in parallel off the same resolved model, so both stay scoped to the same repo set.
• Added matching empty/loading states for Advanced Analytics, fixed stale copy, and made both sections hide their empty-state box while loading.
• Replaced hardcoded "top 15" with accurate PAT-aware text ("top 10 repositories" / "all repositories").
• Removed the premature setModel(null) / setOrgs([]) clear in explore() — data now swaps in atomically once ready, so the page no longer unmounts mid-refresh.

Repo Scoping Reference:

Metric	No PAT (per org)	With PAT (per org)
Repos fetched	≤500	all (public_repos count)
Repos used for contributors/issues/pulls	10 (top by weighted score)	all fetched repos
Contributors	≤100/repo × 10 repos = ≤1,000/org	≤1000/repo × all repos
Issues	≤100/repo × 10 repos = ≤1,000/org	≤1000/repo × all repos
Pull Requests	≤100/repo × 10 repos = ≤1,000/org	≤1000/repo × all repos

Checklist

• My code follows the project's code style and conventions
• I have made corresponding changes to the documentation
• My changes generate no new warnings or errors
• I have joined the Discord server and I will share a link to this PR with the project maintainers there
• I have read the Contributing Guidelines

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Recording.2026-07-10.015637.prev.mp4