Quick Categorize Wizard — follow-up fixes (#1393)

* Extract Entry.uncategorized_transactions scope, remove Family#uncategorized_transaction_count

Adds a single Entry.uncategorized_transactions scope containing the
shared conditions (transactions join, active accounts, category nil,
not transfer kinds, not excluded). All callers now use this scope:

- Entry.uncategorized_matching builds on it
- Transaction::Grouper::ByMerchantOrName#uncategorized_entries uses it
- categorizes_controller#uncategorized_entries_for uses it (also fixes
  missing status/excluded filters that were silently absent before)
- Both controllers replace Current.family.uncategorized_transaction_count
  with Current.accessible_entries.uncategorized_transactions.count so
  the button count and wizard count both respect account sharing

Family#uncategorized_transaction_count removed as it is now unused and
was family-scoped rather than user-scoped.

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

* Scope assign_entry write to Current.accessible_entries

Replaces unscoped Entry.where(id:) with Current.accessible_entries.where(id:)
so the write path is consistent with the find above it. Not exploitable
given the find would 404 first, but removes the pattern inconsistency.

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

* Add privacy-sensitive class to amounts in categorize wizard

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

* Extract uncategorized_count helper in CategorizesController

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

* Fix comment on uncategorized_transactions scope to mention draft accounts

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

* Use uncategorized_count helper in assign_entry action

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

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

app/views/transactions/categorizes/show.html.erb

@@ -29,7 +29,7 @@
       <p class="text-sm text-secondary">
         <%= t(".transaction_count", count: @group.entries.size) %>
         &middot;
-        <%= format_money(@group.entries.sum { |e| e.amount_money.abs }) %>
+        <span class="privacy-sensitive"><%= format_money(@group.entries.sum { |e| e.amount_money.abs }) %></span>
       </p>
     <% end %>
   </div>