storage-resize-images: FUNCTION_MEMORY prompt preselects 512 MB instead of the extension's 1 GB default

[CorieW]

The storage-resize-images kit's FUNCTION_MEMORY prompt preselects 512 MB; the extension preselected 1 GB.

• Kit: defineInt("FUNCTION_MEMORY", { default: 1024, input: select({ "512 MB": 512, "1 GB": 1024, ... }) }) (kits/storage-resize-images/src/config.ts:201-214)
• Extension: type: select, first option 512, default: 1024 (storage-resize-images/extension.yaml)
• Cause: firebase-tools promptSelect passes a non-string default to inquirer unchanged but stringifies every option value, so 1024 matches no choice and the first option is highlighted (functions params: select prompt ignores a non-string default and preselects the first option firebase-tools#11053).

A user who accepts the prompt gets a 512 MB function where the extension gave them 1 GB; the README recommends at least 2 GB for animated GIFs.

Same class as MAKE_PUBLIC, which #3148 fixed by declaring the param as a string. FUNCTION_MEMORY is the only other non-string select across kits/*/src/config.ts whose default is not the first option.

Options: declare it as defineString with "512" / "1024" / ... values and parseInt at read (stored .env values unchanged), or wait for the firebase-tools fix. Either way, add a test that pins the default and option order.

Related: #3148, #2974, firebase/firebase-tools#11053