Add alt text to photo uploads

- Form field for optionally adding a description
- Publish as `imeta` `alt`
- Render as `<img>` alt when set

Fixes a placeholder being published instead. Also strips the current
placeholder if set as alt text (for existing uploads).

pnpm-lock.yaml

@@ -2331,8 +2331,9 @@ packages:
     resolution: {integrity: sha512-lGe34o6EHj9y3Kts9R4ZYs/Gr+6N7MCaMlIFA3F1R2O5/m7K06AxfSeO5530PEERE6/WyEg3lsuyw4GHlPZHog==}
     engines: {node: ^4.5.0 || >= 5.9}
 
-  baseline-browser-mapping@2.9.14:
-    resolution: {integrity: sha512-B0xUquLkiGLgHhpPBqvl7GWegWBUNuujQ6kXd/r1U38ElPT6Ok8KZ8e+FpUGEc2ZoRQUzq/aUnaKFc/svWUGSg==}
+  baseline-browser-mapping@2.11.12:
+    resolution: {integrity: sha512-r7WnVImvVCeFpf2DOXfy41aPWzeNg3H/A2X4dKmy1QL0MSyyk/e7z8ihJ3N6Nn2PsdhkVlqnEfnUE4a05P2aTA==}
+    engines: {node: '>=6.0.0'}
     hasBin: true
 
   basic-auth@2.0.1:
@@ -2538,8 +2539,8 @@ packages:
     resolution: {integrity: sha512-RbsNrFyhwkx+6psk/0fK/Q9orOUr9VMxohGd8vTa4djf4TGLfblBgUfqZChrZuW0Q+mz2eBPFLusw9Jfukzmhg==}
     hasBin: true
 
-  caniuse-lite@1.0.30001764:
-    resolution: {integrity: sha512-9JGuzl2M+vPL+pz70gtMF9sHdMFbY9FJaQBi186cHKH3pSzDvzoUJUPV6fqiKIMyXbud9ZLg4F3Yza1vJ1+93g==}
+  caniuse-lite@1.0.30001809:
+    resolution: {integrity: sha512-xxWVywk6a6Arlk+hymeycyn/VgqEfLDxupvhH/xiY5SJ/18kmi9o6MiO320DCUzypORHLtvh0I4i04tUhCNHNQ==}
 
   capture-exit@2.0.0:
     resolution: {integrity: sha512-PiT/hQmTonHhl/HFGN+Lx3JJUznrVYJ3+AQsnthneZbvW7x+f08Tk7yLJTLEOUvBTbduLeeBkxEaYXUOUrRq6g==}
@@ -8420,7 +8421,7 @@ snapshots:
 
   base64id@2.0.0: {}
 
-  baseline-browser-mapping@2.9.14: {}
+  baseline-browser-mapping@2.11.12: {}
 
   basic-auth@2.0.1:
     dependencies:
@@ -8752,8 +8753,8 @@ snapshots:
 
   browserslist@4.28.1:
     dependencies:
-      baseline-browser-mapping: 2.9.14
-      caniuse-lite: 1.0.30001764
+      baseline-browser-mapping: 2.11.12
+      caniuse-lite: 1.0.30001809
       electron-to-chromium: 1.5.267
       node-releases: 2.0.27
       update-browserslist-db: 1.2.3(browserslist@4.28.1)
@@ -8805,7 +8806,7 @@ snapshots:
     dependencies:
       tmp: 0.0.28
 
-  caniuse-lite@1.0.30001764: {}
+  caniuse-lite@1.0.30001809: {}
 
   capture-exit@2.0.0:
     dependencies: