feat: [2/2] seed source images when selecting generation models

[dazzatronus]

Selecting an image-editing model should use the image already on the clip. Seed an empty imageUrls list from the raw clip source in the same update as model selection. Preserve existing references and merge placeholders.

Activation: requires the existing generation-settings hook, an image clip with a source, and a model declaring imageUrls. Other integrations keep their current inputs. No new configuration or public exports.

Verify: npm run verify:ci passes (2,141 tests, lint, types, build and package contracts). Regression checks cover empty/existing references, raw placeholders, absent sources, video clips and hook/schema gating.

Order	PR	Change	Why separate
1	#199	Clickable status annotations	Host actions and toolbar presentation
2	#200 current	Seed source images	Model selection and stored inputs

flowchart TD
    A[Choose a generation model] --> B{Settings hook enabled and model accepts source images?}
    B -->|No| C[Keep current inputs]
    B -->|Yes| D{Image source present and references empty?}
    D -->|Yes| E[Use clip source as Image 1]
    D -->|No| C
    C --> F{Status hook registered?}
    E --> F
    F -->|No| G[Use normal generation controls]
    F -->|Yes| H[Host supplies status for current settings]
    H --> I{Error status?}
    I -->|Yes| J[Block Generate and Enter]
    I -->|No| K[Apply normal generation checks]
    H --> L{Host supplied an action?}
    L -->|No| M[Show status as text]
    L -->|Yes| N[Show status button beside Generate]
    N --> O[Click or use Enter or Space]
    O --> P[Open the host view]

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Rules: model selection, status activation, generation guard.

[github-actions]

🎉 This PR is included in version 2.22.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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