OTWO-7576 Preserve dark mode settings per user

[Niharika1117]

No description provided.

[Copilot]

Pull request overview

Adds server-backed (per-account) theme preference support so “dark mode” can persist across sessions/devices, and updates the frontend theme toggle to use cookies + a small JSON API instead of only localStorage.

Changes:

• Added Account#theme_preference and Account#theme_preference= backed by Setting records keyed by account id.
• Introduced GET /accounts/:id/theme_preference.json and POST /accounts/:id/set_theme_preference endpoints plus JS fetch-based syncing.
• Updated layout/theme JS to apply theme early (cookie + prefers-color-scheme) and removed debug logging from mobile menu JS.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
app/models/account.rb	Adds per-account theme preference getter/setter backed by Setting.
app/controllers/accounts_controller.rb	Adds JSON endpoints to read/update theme preference.
config/routes.rb	Adds member routes for theme preference endpoints.
app/views/layouts/application.html.haml	Adds early theme application script and emits a current-user meta tag for client-side detection.
app/assets/javascripts/theme_toggle.js	Switches theme persistence to cookie + server sync for authenticated users.
app/assets/javascripts/mobile_menu.js	Removes console logging from mobile menu toggle script.
app/controllers/sessions_controller.rb	Bypasses reCAPTCHA in development for login flow.
test/models/setting_test.rb	Adds tests around storing/retrieving theme settings via Setting.
test/models/account_test.rb	Adds tests for Account#theme_preference behavior and sparse storage semantics.
test/controllers/accounts_controller_test.rb	Adds controller tests for the new endpoints.
test/integration/theme_preference_test.rb	Adds integration coverage for theme preference API behavior.

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