Add RealmService.contains for cross-form membership checks

[backspace]

This was split off #4539, although it’s so small it could have been included!

Substring-prefix checks like card.id.startsWith(realm) only work when both sides are in the same form (URL vs registered prefix). After RRI migration, IDs may be prefix-form while realm URLs are URL-form (or vice versa), silently breaking those checks.

contains resolves both sides to URL form via cardIdToURL before delegating to RealmPaths.inRealm, so cross-form comparisons work as long as the prefix is registered.

Sweeps the two known callers in search.ts and workspace.gts.

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Host Test Results

    1 files  ±  0      1 suites  ±0   2h 0m 14s ⏱️ + 13m 18s
2 562 tests +145  2 547 ✅ +150  15 💤 +1  0 ❌ ±0 
2 581 runs  +146  2 566 ✅ +157  15 💤 +1  0 ❌  - 6 

Results for commit 558a060. ± Comparison against earlier commit 9a39a4a.

Realm Server Test Results

    1 files  ±  0      1 suites  ±0   17m 16s ⏱️ + 8m 27s
1 212 tests +211  1 212 ✅ +211  0 💤 ±0  0 ❌ ±0 
1 284 runs  +241  1 284 ✅ +241  0 💤 ±0  0 ❌ ±0 

Results for commit 558a060. ± Comparison against earlier commit 9a39a4a.

[Copilot]

Pull request overview

This PR introduces a reliable realm-membership helper on the Host-side RealmService to avoid incorrect startsWith() realm checks when identifiers may be in mixed forms (URL-form vs registered-prefix form) after the RRI migration.

Changes:

• Added RealmService.contains(realm, resource) that normalizes both inputs to URL-form via cardIdToURL() and then uses RealmPaths.inRealm().
• Updated SearchResource.instancesByRealm to use realm.contains() instead of card.id.startsWith(realm).
• Updated workspace deletion “active workspace” detection to use realm.contains() for open card IDs.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/host/app/services/realm.ts	Adds RealmService.contains() for cross-form realm membership checks (URL/prefix).
packages/host/app/resources/search.ts	Switches realm grouping logic to use realm.contains() instead of string prefix checks.
packages/host/app/components/operator-mode/workspace-chooser/workspace.gts	Uses realm.contains() when checking if any open card belongs to the workspace realm.

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