fix(dashboard): format Potential savings stat with configured currency

[SomSamantray]

The dashboard "Potential savings" stat now renders in the configured default currency and locale instead of a hardcoded dollar sign. A user on EUR/GBP/AUD previously saw a $ value that did not match the rest of their dashboard; the stat now uses the same CurrencyHelper formatting as the min/avg/max aggregates and product cards.

Fixes #196

Tests: new tests/Feature/View/StatBarTest.php covers configured-currency (EUR) and USD rendering of the stat cell. The full suite runs in CI (php artisan test); a local run was not possible in this environment (no PHP/Docker), so CI is the verification run.

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Summary by CodeRabbit

• Bug Fixes

  • Potential savings on the dashboard now respects the configured currency and locale.
  • Values display correctly for currencies such as EUR and USD.

• Tests

  • Added coverage to verify currency formatting and prevent regressions.

• Documentation

  • Added an implementation plan documenting the currency-formatting change and verification steps.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: c261f0c8-f888-4666-bfff-fce9fdba880f

📥 Commits

Reviewing files that changed from the base of the PR and between cec656b and d698dbf.

📒 Files selected for processing (3)

• docs/plans/196-potential-savings-currency.md
• resources/views/filament/widgets/dashboard/stat-bar.blade.php
• tests/Feature/View/StatBarTest.php

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📝 Walkthrough

Walkthrough

The dashboard Potential Savings stat now uses CurrencyHelper::toString() with configured currency settings. A feature test verifies EUR and USD rendering. An implementation plan documents the scope and validation steps.

Changes

Potential Savings currency formatting

Layer / File(s)	Summary
Currency formatting plan and validation contract docs/plans/196-potential-savings-currency.md	The plan defines configured-currency formatting, preserves other stat cells and the $stats structure, and specifies EUR and USD regression tests.
Stat bar formatting and regression tests resources/views/filament/widgets/dashboard/stat-bar.blade.php, tests/Feature/View/StatBarTest.php	The view uses CurrencyHelper::toString() for Potential Savings. The feature test verifies configured EUR output and default USD output.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: formatting the dashboard Potential savings stat with the configured currency.
Linked Issues check	✅ Passed	The implementation uses CurrencyHelper with configured currency and adds EUR and USD regression tests, satisfying issue #196.
Out of Scope Changes check	✅ Passed	The view change, regression tests, and implementation plan directly support the currency-formatting objective in issue #196.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[SomSamantray]

Babysit run report

Automated watch of this PR (pipeline mode) stopped with one residual:

• CI run #439 is awaiting approval. This is a first-time fork-PR workflow run; only an admin of jez500/pricebuddy can approve it (POST /actions/runs/439/approve requires admin rights). Until it is approved, the tests check cannot start, so merge readiness cannot be confirmed from CI.

State at stop: no unresolved review threads, no other actionable feedback. CodeRabbit's own review was still in progress on the current head and will report separately.

Once the run is approved, re-run /ce-babysit-pr https://github.com/jez500/pricebuddy/pull/215 to watch it through to CI-decided.