feat: support campaign co-creators and mobile image loading

[Fayedamz]

Summary
This PR addresses issues #700 and #717 in a single change set.
#700 — Fix mobile campaign image loading
Adds a reusable campaign detail image gallery with responsive image sizing. The hero image loads eagerly with high priority, while all below-the-fold images use lazy loading and asynchronous decoding to reduce mobile rendering jank on screens below 768px. Focused test coverage verifies the loading behavior.
#717 — Support campaign co-creation
Extends the campaign-funding contract to support multiple campaign creators with shared ownership and decision-making. Campaigns can now be created with an ordered list of creators and revenue shares expressed in basis points totaling 10,000. All creators must authorize shared actions, and successful campaign proceeds are distributed proportionally according to the configured shares.
The contract also exposes creator and revenue-share queries and supports adding co-creators before a campaign succeeds, while preserving backward compatibility with the existing single-creator campaign API.
Validation
Focused campaign image-gallery test passes.
Modified contract passes cargo check in a temporary workspace after removing the repository’s pre-existing duplicate soroban-sdk manifest key.
git diff --check passes.
Full frontend build/lint remains blocked by unrelated pre-existing errors, including duplicate Header exports and existing lint violations.

closes #700
closes #717

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[Utilitycoder]

Please fix up the merge conflict and update your PR. Kindly ensure you offramp with Fundable at https://stellar.fundable.finance/offramp

[Utilitycoder]

Please fix up the merge conflict and update your PR. Kindly ensure you offramp with Fundable at https://stellar.fundable.finance/offramp

[Idrhas]

Fix your conflicts to get PR merged, and don't forget to use https://stellar.fundable.finance for your offramps