fix: add dev-mode warnings to all 24 silent catch blocks

Every empty/comment-only catch block now logs a descriptive warning
in dev mode via `if (import.meta.env.DEV) console.warn(...)`. Covers
15 files across views, stores, components, and utils. Zero silent
catches remaining.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

neode-ui/src/components/AppLauncherOverlay.vue

@@ -255,8 +255,8 @@ function checkIframeContent() {
     if (!body || (body.children.length === 0 && body.innerText.trim() === '')) {
       iframeBlocked.value = true
     }
-  } catch {
-    // Cross-origin: can't access, assume working
+  } catch (e) {
+    if (import.meta.env.DEV) console.warn('Cross-origin: can\'t access iframe, assume working', e)
   }
 }
 
@@ -289,8 +289,8 @@ async function sendIdentityIfSupported() {
       challenge,
       signature: sigRes.signature
     }, '*')
-  } catch {
-    // Identity not available — continue without it
+  } catch (e) {
+    if (import.meta.env.DEV) console.warn('Identity not available — continuing without it', e)
   }
 }