Add Formula Library ratings, Job Profitability report, and Quote Revision History improvements

- Formula Library ratings: thumbs up/down per company per formula; toggle on/off; sorts by net score; own formulas not rateable; FormulaLibraryRating entity + migration AddFormulaLibraryRatings
- Job Profitability report: actual labor cost (logged hours x StandardLaborRate) vs powder cost vs billed price per job; gross margin % color-coded; time-tracked-only filter; totals footer
- Quote Revision History: track Total price changes on every save; log Sent/Resent events with recipient email; replace flat table with grouped timeline UI (icons per event type, total-change badge on header)
- Setup Wizard: cap CompletedCount at TotalSteps so old 10-step data no longer shows 10/5
- Formula Library card: fix badge overflow on long titles; add Rate: label to make voting buttons discoverable
- Help docs and AI knowledge base updated for all three features

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Application/Interfaces/IFormulaLibraryService.cs

@@ -48,4 +48,14 @@ public interface IFormulaLibraryService
     /// when a diagram is deleted or replaced.
     /// </summary>
     Task CascadeRemoveDiagramAsync(int sourceCustomItemTemplateId);
+
+    /// <summary>
+    /// Records or toggles a thumbs-up/down vote from the given company.
+    /// If the same vote already exists it is removed (toggle off).
+    /// If the opposite vote exists it is replaced.
+    /// Companies cannot rate their own formulas.
+    /// Returns the updated counts for the library entry.
+    /// </summary>
+    Task<(int ThumbsUp, int ThumbsDown, bool? MyVote)> RateAsync(
+        int libraryItemId, int companyId, bool isPositive);
 }