feat: add clickable activity cards with comment anchor links to profile tab

Add `url` field to profile activity items so post cards link to `/posts/{slug}` and comment cards link to the parent post with a `#comment-{uid}` anchor, matching notification click behavior. Include the shared `_card_link.html` overlay in the template, fix XP bar rendering for missing `xp` key, and add API + e2e tests verifying the link structure and navigation.

devplacepy/routers/profile/index.py

@@ -26,6 +26,7 @@ from devplacepy.database import (
     get_user_media,
     search_users_by_username,
     mark_notifications_read_by_target,
+    resolve_object_url,
 )
 from devplacepy.content import can_view_project, enrich_items
 from devplacepy.utils import (
@@ -209,6 +210,7 @@ async def profile_page(
                     "time_ago": time_ago(p["created_at"]),
                     "created_at": p["created_at"],
                     "uid": p["uid"],
+                    "url": resolve_object_url("post", p["uid"]),
                 }
             )
         comments_table = get_table("comments")
@@ -228,6 +230,7 @@ async def profile_page(
                     "created_at": c["created_at"],
                     "uid": target_uid,
                     "target_type": target_type,
+                    "url": f"{resolve_object_url(target_type, target_uid)}#comment-{c['uid']}",
                 }
             )
         activities.sort(key=lambda a: a["created_at"], reverse=True)