feat(reports): add category-aware curator approval confirmation messages

[vcnainala]

Summary

• Add explicit approve-modal headings, descriptions, and submit labels for curators based on report category (SUBMISSION, UPDATE, REVOKE) and review stage (first vs final four-eyes approval)
• Replace generic post-approval toast notifications with category-specific success messages
• Add unit tests covering the approval message matrix

Closes #770

Test plan

• php artisan test tests/Unit/ReportApprovalMessageTest.php (14 tests passing)
• As curator 1 on a SUBMITTED UPDATE report, confirm Approve modal states changes will be forwarded, not applied
• As curator 2 on PENDING_APPROVAL UPDATE report, confirm modal states selected changes will be applied
• As curator 2 on PENDING_APPROVAL SUBMISSION, confirm modal states a new molecule entry will be created
• As curator 2 on PENDING_APPROVAL REVOKE (molecule), confirm modal states the molecule will be revoked/deactivated
• As curator 2 on REVOKE (citation/collection/organism), confirm modal warns about manual changes and status-only approval
• Confirm success toasts match the action taken

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.39785% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 7.02%. Comparing base (a4c26c6) to head (c8215e2).
⚠️ Report is 4 commits behind head on development.

Files with missing lines	Patch %	Lines
...pp/Filament/Dashboard/Resources/ReportResource.php	91.39%	8 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##             development    #807      +/-   ##
================================================
+ Coverage           6.14%   7.02%   +0.87%     
- Complexity          1736    1758      +22     
================================================
  Files                227     227              
  Lines               8945    9043      +98     
================================================
+ Hits                 550     635      +85     
- Misses              8395    8408      +13     

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