Double-clicking a pictogram in the web editor now opens the media selection window directly on the pictogram tab. This saves users from manually switching tabs and makes editing visual content more predictable.

Prior to this fix, the media modal would not open in the picto tab when double clicking a pictogram.

Jabberwock PR: https://github.com/odoo-dev/jabberwock/pull/448

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This fixes an automated signing test so it waits for the signing screen to finish loading before trying to add a signature. The change helps prevent false test failures and supports more dependable quality checks for the Sign app.