Update icon settings in auth_oidc

[Lai Wei (weilai-irl)]

No description provided.

[Copilot]

Pull request overview

This PR updates the auth_oidc plugin’s login-page icon configuration by trimming the available stock icon list to OIDC-relevant choices, adding new SVG icons, updating defaults, and introducing an upgrade migration to preserve previously-selected (now-removed) stock icons.

Changes:

• Replace the stock icon selector options with Microsoft/OIDC-related icons and update the default icon.
• Add new SVG icon assets and adjust icon-related UI/help text.
• Add an upgrade migration to move removed stock icon selections into the custom icon file area.

Reviewed changes

Copilot reviewed 8 out of 15 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
auth/oidc/version.php	Bumps plugin version (currently to a float value).
auth/oidc/settings.php	Updates icon selector options/default; expands accepted custom icon types.
auth/oidc/pix/openid.svg	Adds new OpenID icon asset.
auth/oidc/pix/office_365.svg	Adds new Office 365 icon asset.
auth/oidc/pix/microsoft.svg	Adds new Microsoft icon asset.
auth/oidc/pix/microsoft_365.svg	Adds new Microsoft 365 icon asset.
auth/oidc/pix/microsoft_365_copilot.svg	Adds new Microsoft 365 Copilot icon asset.
auth/oidc/lib.php	Updates custom icon initialization to remove stale previous extensions and preserve the uploaded extension.
auth/oidc/lang/en/auth_oidc.php	Updates icon alt strings and custom icon help text.
auth/oidc/db/upgrade.php	Adds upgrade step to migrate removed icon choices.
auth/oidc/classes/utils.php	Implements migration logic for removed icon choices into custom icon storage.
auth/oidc/classes/loginflow/authcode.php	Updates default icon handling and adjusts display name formatting when showing an icon.
auth/oidc/classes/adminsetting/iconselect.css	Tweaks icon selector image spacing.

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