Fix three more merge defects the compile found

Session.kt declared `arrived` twice, once per side. Main's filter is the one
to keep: its own comment records that filtering on `isRenderable` here made
the reaction, edit and pin branches unreachable, so everything that arrived
was decrypted and then dropped. The release branch's declaration is gone and
the loop uses the broader list, which is what main's fix intended.

StoryFrame.kt was extracted from StoriesScreens and localized in the same
move, so it calls `stringResource(R.string.social_story_image_desc)` without
importing either name. Both imports added. The key is in values and values-es
already; parity is 860 keys per language.

SilentKindsTest pinned "bridge offer" to `Content.bridgeOffer(...)`, which
returned String on the release branch and String? on main, where a blank or
over-long line is refused (§24.4). That typed the whole map String? and the
two assertions stopped compiling. The test line is neither blank nor long, so
it is unwrapped at the fixture.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

app/src/main/kotlin/io/flamenet/messenger/app/Session.kt

@@ -2393,7 +2393,9 @@ class Session(
             }
         }
 
-        val arrived = everything.filter { it.content.isRenderable }
+        // `arrived` is declared once, above, and deliberately NOT filtered on
+        // `isRenderable`: see the note there. The loop below files only
+        // renderable content as a message.
         val now = DeviceClock.expirySeconds()
         val incomingStories = mutableListOf<Vault.Story>()
 

app/src/main/kotlin/io/flamenet/messenger/app/StoryFrame.kt

@@ -17,6 +17,8 @@ import androidx.compose.ui.graphics.ImageBitmap
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.res.stringResource
+import io.flamenet.messenger.R
 
 /**
  * How a story's photo sits in its feed card (DESIGN item 27): all of it,

client/src/test/kotlin/io/flamenet/client/SilentKindsTest.kt

@@ -71,7 +71,9 @@ class SilentKindsTest {
             "off the record" to Content.offTheRecord(true),
             "off the record, echoed" to Content.offTheRecord(true, echo = true),
             "screenshot notice" to Content.screenshot(1),
-            "bridge offer" to Content.bridgeOffer("bridge line"),
+            // `bridgeOffer` is nullable since main refused a blank or
+            // over-long line (§24.4). This line is neither.
+            "bridge offer" to Content.bridgeOffer("bridge line")!!,
             "delivery key" to SealedSender.deliveryKeyEnvelope(ByteArray(32)),
             "group delivery key" to SealedSender.deliveryKeyEnvelope(ByteArray(32), groupId = "g-1", groupName = "Saturday"),
         )