Improve investment activity labels UX and add convert-to-trade feature (#649)

* Add `investment_activity_label` to trades and enhance activity label handling

- Introduced `investment_activity_label` column to the `trades` table with a migration.
- Backfilled existing `trades` with activity labels based on quantity (`Buy`, `Sell`, or `Other`).
- Replaced `category_id` in trades with `investment_activity_label` for better alignment with transaction labels.
- Updated views and controllers to display and manage activity labels for trades.
- Added localized badge components for displaying and editing labels dynamically.
- Enhanced `PlaidAccount::Investments::TransactionsProcessor` to assign and process activity labels automatically.
- Added investment flows section to reports for tracking contributions and withdrawals.
- Refactored related tests and models for consistency and to ensure proper validation and filtering.

* Improve handling of `investment_activity_label`, trade type, and security selection in trades and transactions

- Refined label assignment logic in `trades_controller` to default to `Buy`/`Sell` based on transaction nature.
- Simplified security selection in `transactions_controller` by resolving via unique IDs or custom tickers.
- Streamlined UI for trade and transaction forms by updating dropdown options and label text.
- Enabled quick-edit badges to open `convert_to_trade` modal when applicable, enhancing flexibility.
- Adjusted tests and views to align with updated workflows and ensure consistent behavior.

* Improve handling of `investment_activity_label`, trade type, and security selection in trades and transactions

- Refined label assignment logic in `trades_controller` to default to `Buy`/`Sell` based on transaction nature.
- Simplified security selection in `transactions_controller` by resolving via unique IDs or custom tickers.
- Streamlined UI for trade and transaction forms by updating dropdown options and label text.
- Enabled quick-edit badges to open `convert_to_trade` modal when applicable, enhancing flexibility.
- Adjusted tests and views to align with updated workflows and ensure consistent behavior.

* Improve handling of `investment_activity_label`, trade type, and security selection in trades and transactions

- Refined label assignment logic in `trades_controller` to default to `Buy`/`Sell` based on transaction nature.
- Simplified security selection in `transactions_controller` by resolving via unique IDs or custom tickers.
- Streamlined UI for trade and transaction forms by updating dropdown options and label text.
- Enabled quick-edit badges to open `convert_to_trade` modal when applicable, enhancing flexibility.
- Adjusted tests and views to align with updated workflows and ensure consistent behavior.

* Add safeguard for `dropdownTarget` existence in quick edit controller

- Prevent errors by ensuring `dropdownTarget` is present before toggling its visibility.

* Fix undefined method 'category' for Trade on mobile view

Trade model uses investment_activity_label, not category. The upstream
merge introduced a call to trade.category which doesn't exist. Use the
activity label badge on mobile instead.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Fix activity label logic for zero/blank quantity and sell inference

- Return `nil` for blank or zero quantity in `investment_activity_label_for`.
- Correct `is_sell` logic to use the amount’s sign properly in `transactions_controller`.

* Fix i18n key paths in transactions controller for convert_to_trade

- Update flash message translations to use full i18n paths.
- Use `BigDecimal` for quantity and price calculations to improve precision.

---------

Co-authored-by: Josh Waldrep <joshua.waldrep5+github@gmail.com>
Co-authored-by: luckyPipewrench <luckypipewrench@proton.me>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

app/javascript/controllers/activity_label_quick_edit_controller.js

@@ -0,0 +1,108 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  static targets = ["dropdown", "badge"]
+  static values = {
+    url: String,
+    entryableId: String,
+    currentLabel: String,
+    entryableType: String,
+    convertUrl: String
+  }
+
+  connect() {
+    // Close dropdown when clicking outside
+    this.boundCloseOnClickOutside = this.closeOnClickOutside.bind(this)
+    document.addEventListener("click", this.boundCloseOnClickOutside)
+  }
+
+  disconnect() {
+    document.removeEventListener("click", this.boundCloseOnClickOutside)
+  }
+
+  toggle(event) {
+    event.preventDefault()
+    event.stopPropagation()
+
+    if (this.hasDropdownTarget) {
+      this.dropdownTarget.classList.toggle("hidden")
+    }
+  }
+
+  closeOnClickOutside(event) {
+    if (!this.element.contains(event.target)) {
+      this.close()
+    }
+  }
+
+  close() {
+    if (this.hasDropdownTarget) {
+      this.dropdownTarget.classList.add("hidden")
+    }
+  }
+
+  async select(event) {
+    event.preventDefault()
+    event.stopPropagation()
+
+    const label = event.currentTarget.dataset.label
+
+    // Don't update if it's the same label
+    if (label === this.currentLabelValue) {
+      this.close()
+      return
+    }
+
+    // For Transactions: Buy/Sell should prompt to convert to trade
+    if (this.entryableTypeValue === "Transaction" && (label === "Buy" || label === "Sell") && this.hasConvertUrlValue) {
+      this.close()
+      // Navigate to convert-to-trade modal in a Turbo frame, passing the selected label
+      const url = new URL(this.convertUrlValue, window.location.origin)
+      url.searchParams.set("activity_label", label)
+      Turbo.visit(url.toString(), { frame: "modal" })
+      return
+    }
+
+    // For other labels (Dividend, Interest, Fee, etc.) or for Trades, just save the label
+    const csrfToken = document.querySelector('meta[name="csrf-token"]')?.content
+    if (!csrfToken) {
+      console.error("CSRF token not found")
+      return
+    }
+
+    try {
+      const response = await fetch(this.urlValue, {
+        method: "PATCH",
+        headers: {
+          "Content-Type": "application/json",
+          "X-CSRF-Token": csrfToken,
+          "Accept": "text/vnd.turbo-stream.html"
+        },
+        body: JSON.stringify({
+          entry: {
+            entryable_attributes: {
+              id: this.entryableIdValue,
+              investment_activity_label: label
+            }
+          }
+        })
+      })
+
+      if (response.ok) {
+        const contentType = response.headers.get("content-type")
+        if (contentType?.includes("text/vnd.turbo-stream.html")) {
+          // Let Turbo handle the stream response
+          const html = await response.text()
+          Turbo.renderStreamMessage(html)
+        }
+        // Update local state and badge
+        this.currentLabelValue = label
+        this.close()
+      } else {
+        console.error("Failed to update activity label:", response.status)
+      }
+    } catch (error) {
+      console.error("Error updating activity label:", error)
+    }
+  }
+}