fix(web): prevent dark theme navigation flash

[ccarvalho-eng]

Motivation

Dark mode could briefly render the light theme while moving between dashboard pages. Navigation triggered full document loads, and the persisted theme was not applied until after the stylesheet loaded.

Test Plan

• Added a regression test that verifies the saved theme is applied before stylesheet loading.
• Verified dashboard navigation uses LiveView navigation.
• Verified the source and compiled JavaScript assets remain synchronized.
• Passed the complete test suite, static analysis, dependency audit, documentation build, production compilation, and package dry run.

Next Steps

None.

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Configuration used: defaults

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Plan: Team

Run ID: b24d6199-d9bf-438a-b437-b589fe91f382

📥 Commits

Reviewing files that changed from the base of the PR and between 35f76fa and e31826c.

📒 Files selected for processing (5)

• assets/js/app.js
• lib/aludel/web/components/layouts.ex
• lib/aludel/web/components/layouts/root.html.heex
• priv/static/app.js
• test/aludel_web/live/dashboard_live_test.exs

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