LLM cost estimation (#223)

* Password reset back button also after confirmation

Signed-off-by: Juan José Mata <juanjo.mata@gmail.com>

* Implement a filter for category (#215)

- Also implement an is empty/is null condition.

* Implement an LLM cost estimation page

Track costs across all the cost categories: auto categorization, auto merchant detection and chat.
Show warning with estimated cost when running a rule that contains AI.

* Update pricing

* Add google pricing

and fix inferred model everywhere.

* Update app/models/llm_usage.rb

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Signed-off-by: soky srm <sokysrm@gmail.com>

* FIX address review

* Linter

* Address review

- Lowered log level
- extracted the duplicated record_usage method into a shared concern

* Update app/controllers/settings/llm_usages_controller.rb

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Signed-off-by: soky srm <sokysrm@gmail.com>

* Moved attr_reader out of private

---------

Signed-off-by: Juan José Mata <juanjo.mata@gmail.com>
Signed-off-by: soky srm <sokysrm@gmail.com>
Co-authored-by: Juan José Mata <juanjo.mata@gmail.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

app/models/rule/action_executor/auto_categorize.rb

@@ -1,9 +1,31 @@
 class Rule::ActionExecutor::AutoCategorize < Rule::ActionExecutor
   def label
+    base_label = "Auto-categorize transactions with AI"
+
     if rule.family.self_hoster?
-      "Auto-categorize transactions with AI ($$)"
+      # Use the same provider determination logic as Family::AutoCategorizer
+      llm_provider = Provider::Registry.get_provider(:openai)
+
+      if llm_provider
+        # Estimate cost for typical batch of 20 transactions
+        selected_model = Provider::Openai.effective_model
+        estimated_cost = LlmUsage.estimate_auto_categorize_cost(
+          transaction_count: 20,
+          category_count: rule.family.categories.count,
+          model: selected_model
+        )
+        suffix =
+          if estimated_cost.nil?
+            " (cost: N/A)"
+          else
+            " (~$#{sprintf('%.4f', estimated_cost)} per 20 transactions)"
+          end
+        "#{base_label}#{suffix}"
+      else
+        "#{base_label} (no LLM provider configured)"
+      end
     else
-      "Auto-categorize transactions"
+      base_label
     end
   end