Sending URL Preview Bundles (MSC 4095) (#34150)

* Fetches link previews for all links in message (instead of just the first one)

* message url component to display preview for multiple urls

* Revert visible behaviour back to only showing one URL preview

While fetching all link previews in the text message.

* Moved URL preview VM to MessageComposer

* Added com.beeper.linkpreviews to messages sent with the markdown compositor

* MSC 4452 implemented for the older (markdown) composer

* claude told me to use logger instead of console

* Previews generated with snapshot instead of vm

* moved attachPreviews to a separate file

* added attach URL previews to rich text editor

* don't let attachUrlPreviews block clearning the composer

* fixed linter errors

* moved url preview behind labs feature gate

* passed linters

* moved lab feature checking to where attach preview is used

* claude wrote some unit tests for url previewing

* fixed linter errors

* added feature to labs.md

* fixed linter errors

* fixed oxfmt error

* set previews to none if all previews failed

* resolved PR reviews besides the ones that requires a larger code change

* moved url preview VM creation to message composer

* removed delay when clearing composer url preview on message send

* minor changes to stop using globals everywhere

* moved debouncing responsibility to urlpreviewVM

* minor lint fixes

* added comment

* remove composer content from the state of urlpreview, moved it to the vm

* urlpreviewwrapper depends on the vm only

* added comments

* edited the comment

* updated snapshots

* claude fixed tests

* enable feature for tests that requires MSC4095

* updated snapshot

apps/web/test/viewmodels/message-body/__snapshots__/UrlPreviewGroupViewModel-test.ts.snap

@@ -9,6 +9,7 @@ exports[`UrlPreviewGroupViewModel should deduplicate multiple versions of the sa
       "description": "This is a description",
       "image": undefined,
       "link": "https://example.org",
+      "ogUrl": "https://example.org",
       "showTooltipOnLink": false,
       "siteIcon": undefined,
       "siteName": "Example.org",
@@ -38,6 +39,7 @@ exports[`UrlPreviewGroupViewModel should handle being hidden and shown by the us
       "description": "This is a description",
       "image": undefined,
       "link": "https://example.org",
+      "ogUrl": "https://example.org",
       "showTooltipOnLink": false,
       "siteIcon": undefined,
       "siteName": "Example.org",
@@ -76,6 +78,7 @@ exports[`UrlPreviewGroupViewModel should ignore media when mediaVisible is false
       "description": undefined,
       "image": undefined,
       "link": "https://example.org",
+      "ogUrl": "https://example.org",
       "showTooltipOnLink": false,
       "siteIcon": undefined,
       "siteName": "example.org",
@@ -96,6 +99,7 @@ exports[`UrlPreviewGroupViewModel should preview a single valid URL 1`] = `
       "description": "This is a description",
       "image": undefined,
       "link": "https://example.org",
+      "ogUrl": "https://example.org",
       "showTooltipOnLink": false,
       "siteIcon": undefined,
       "siteName": "Example.org",