Add host mode rehydration

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Preview deployments

• Host staging preview
• Host production preview

[github-actions]

Host Test Results

    1 files  ±  0      1 suites  ±0   1h 40m 28s ⏱️ + 11m 26s
1 897 tests +141  1 880 ✅ +139  17 💤 +2  0 ❌ ±0 
1 912 runs  +142  1 895 ✅ +140  17 💤 +2  0 ❌ ±0 

Results for commit 2b7eeea. ± Comparison against base commit fb9f69a.

This pull request removes 5 and adds 146 tests. Note that renamed tests count towards both.

Chrome ‑ Unit | card-menu-items: ai-assistant context contains Copy to Workspace when editable
Chrome ‑ Unit | card-menu-items: ai-assistant context omits Copy to Workspace when not editable
Chrome ‑ Unit | card-menu-items: code-mode-playground includes sample-data tagged items and Open in Code Mode
Chrome ‑ Unit | card-menu-items: code-mode-preview includes Copy Card URL and Open in Interact Mode
Chrome ‑ Unit | card-menu-items: interact context includes Copy Card URL and (when editable) New Card of This Type and Delete

Chrome ‑ Acceptance | code submode tests > multiple realms: default realm is the personal realm
Chrome ‑ Acceptance | code submode tests > multiple realms: first item in add file realm dropdown is the currently displayed realm
Chrome ‑ Acceptance | code submode tests > single realm > with connection to test realm: code submode handles binary files
Chrome ‑ Acceptance | code submode tests > single realm: Clicking card in search panel opens card JSON in editor
Chrome ‑ Acceptance | code submode tests > single realm: Open in Interact and Edit Template buttons work correctly
Chrome ‑ Acceptance | code submode tests > single realm: can handle error when user puts unidentified domain in card URL bar
Chrome ‑ Acceptance | code submode tests > single realm: card preview live updates when index changes
Chrome ‑ Acceptance | code submode tests > single realm: card preview live updates when there is a change in module
Chrome ‑ Acceptance | code submode tests > single realm: card preview live updates with error
Chrome ‑ Acceptance | code submode tests > single realm: card preview will show in the 3rd column when submode is set to code
…

♻️ This comment has been updated with latest results.