Migrate to Harmonia version 3

[StanZGenchev]

What does this PR do?

Updates the application layer to run on Harmonia 3.1.2.

It also fixes every Harmonia use that was invalid like:

• invented attributes
• variants that silently do nothing
• removes classes missing from the official Harmonia CSS set

It also fixes:

• two Lucide placeholders that throw at init
• tabs not initialized properly that throw at init as well

Changes

A lot of things changed. This is a very short summary of them:

• Bumps Harmonia to 3.1.2, Alpine to 3.16.3, Lucide to 1.20.0, pinecone-router to 7.6.0, i18next to 26.3.6
• Sidebar destinations now use x-h-sidebar-menu-nav
• Monitoring process tabs now use x-h-tab-item + aria-controls + x-h-tabs-content
• Log-file list now uses x-h-list-item-button + aria-current
• The dialog content padding override in the shared app.css is removed. Use the new dialog padding options in version 3.x
• Every <i x-h-lucide> was changed to <svg x-h-lucide> and decorative icons got role="presentation"
• Removes and replaces non-existent classes to classes shipped in Harmonia class or add inline styles where appropriate
• All --color-* tokens were moved to the official Harmonia color tokens
• All data-variant="emphasized" attributes were changed to data-variant="primary". "emphasized" is a BlimpKit thing, it doesn't exist in Harmonia.
• data-size removed from dialogs/spinner
• data-filter was moved to the x-h-select-search element
• Fixed wrong theme initialization and use
• Toasts/Notifications are now created using the official $notifications.add
• Document conversation thread was migrated to use the x-h-bubble component
• x-h-pagination is now used in the list/master/manage and report views
• Notification popup buttons now use x-h-badge-indicator
• Cards now ave a flush content with data-bordered="horizontal" table headers in Monitoring
• Changed form builder button states to be mapped to Harmonia variants
• Changed the .claude/docs/harmonia-ui.md doc to point at the upstream skill

Tests

I introduced a new guard test. HarmoniaContractIT reads the directive registry out of dist/harmonia.min.js + harmonia-lucide.min.js and the class allowlist out of skills/harmonia/references/utility-classes.md inside the pinned webjar, then scans every Harmonia page and checks for the use of non-existent components/directives.

Not verified: the release-profile javadoc run (no javadoc binary on the build
machine) and the manual browser pass (theme sync into iframes and tabs, toast on
save, attachment-card padding screenshots).

What issues does this PR fix or reference?

#7352