fix: remove deleted games from gallery store

[gantoine]

Summary

• remove deleted games from the v2 gallery store
• keep legacy and v2 delete dialogs synchronized

Validation

• npm run typecheck (frontend)

[greptile-apps]

Greptile Summary

This PR keeps the v2 gallery store in sync with ROM deletion and scan events. The main changes are:

• Legacy and v2 delete dialogs now remove deleted ROMs from the v2 gallery store.
• The scan lifecycle now sends scanned ROMs into the active v2 gallery.
• The v2 gallery store now updates local totals, indexes, and platform counts for live adds and deletes.

Confidence Score: 4/5

The live scan path can put the active v2 gallery into an incorrect filtered or sorted state.

• Deleted ROM removal looks consistent with the gallery store state.
• Live scan insertion bypasses the backend query filters used to define the current gallery.
• Live scan insertion also bypasses the server ordering used for gallery positions.

frontend/src/v2/composables/useScanLifecycle/index.ts and frontend/src/v2/stores/galleryRoms.ts

Important Files Changed

Filename	Overview
frontend/src/components/common/Game/Dialog/DeleteRom.vue	Adds v2 gallery-store removal after successful legacy dialog deletion.
frontend/src/v2/components/Dialogs/DeleteRomDialog.vue	Adds v2 gallery-store removal after successful v2 dialog deletion.
frontend/src/v2/composables/useScanLifecycle/index.ts	Adds live scan updates to the v2 gallery based only on platform id.
frontend/src/v2/stores/galleryRoms.ts	Adds live ROM insertion and expands deletion handling for gallery metadata.

_{Reviews (1): Last reviewed commit: "fix: remove deleted games from gallery s..." | Re-trigger Greptile}

[Copilot]

Pull request overview

This PR updates the v2 gallery ROM store so it stays in sync with scan and delete flows, ensuring the gallery list reflects newly scanned ROMs and removed/deleted ROMs consistently across legacy (v1) and v2 dialogs.

Changes:

• Add live-scan integration to update the active v2 gallery list when a ROM is scanned for the currently viewed platform.
• Wire both the v2 and legacy delete dialogs to also remove deleted ROMs from the v2 gallery store.
• Extend the v2 gallery store with addLiveRom() and broaden remove() to update store metadata/state on deletion.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
frontend/src/v2/stores/galleryRoms.ts	Adds live ROM insertion and expands deletion handling in the v2 gallery store.
frontend/src/v2/composables/useScanLifecycle/index.ts	Sends scan socket ROM updates into the v2 gallery store when relevant.
frontend/src/v2/components/Dialogs/DeleteRomDialog.vue	Ensures v2 delete dialog also updates the v2 gallery store.
frontend/src/components/common/Game/Dialog/DeleteRom.vue	Ensures legacy delete dialog also updates the v2 gallery store.

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