refactor: centraliser user, humansize et trash_count dans le context processor

user et humansize injectés via _inject_globals() pour toutes les pages.
Supprime les 8 injections manuelles redondantes dans les routes.
Corrige le bug : /trash n'avait pas user → header incomplet.

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

app/app.py

@@ -356,7 +356,12 @@ def _entry(item: Path) -> dict:
 
 @app.context_processor
 def _inject_globals():
-    return {"trash_count": _trash_count() if _user() else 0}
+    u = _user()
+    return {
+        "user":        u,
+        "trash_count": _trash_count() if u else 0,
+        "humansize":   _humansize,
+    }
 
 
 # ── Auth ──────────────────────────────────────────────────────────────
@@ -414,12 +419,10 @@ def dashboard():
             folders[item.name] = _folder_stats(item)
 
     return render_template("dashboard.html",
-        user=_user(),
         folders=folders,
         total_files=sum(v["files"] for v in folders.values()),
         total_size=sum(v["size"] for v in folders.values()),
         trash=_trash_stats(),
-        humansize=_humansize,
     )
 
 
@@ -462,11 +465,9 @@ def browse(subpath=""):
     ]
 
     return render_template("browse.html",
-        user=_user(),
         entries=entries,
         subpath=subpath,
         breadcrumb=breadcrumb,
-        humansize=_humansize,
         has_hits=STATS_JSON.is_file(),
     )
 
@@ -486,7 +487,6 @@ def _file_preview(path: Path, subpath: str):
     next_path = str(siblings[idx + 1].relative_to(ASSETS_ROOT)) if idx is not None and idx < len(siblings) - 1 else None
 
     ctx = dict(
-        user=_user(),
         subpath=subpath,
         filename=path.name,
         filesize=_humansize(stat.st_size),
@@ -567,14 +567,12 @@ def search():
             results.append(e)
 
     return render_template("search.html",
-        user=_user(),
         q=q,
         after=after_s,
         before=before_s,
         in_content=in_content,
         results=results,
         searched=searched,
-        humansize=_humansize,
     )
 
 
@@ -586,7 +584,6 @@ def stats():
     if redir:
         return redir
     return render_template("stats.html",
-        user=_user(),
         has_report=STATS_FILE.is_file(),
     )
 
@@ -691,7 +688,7 @@ def trash_list():
         return redir
     _trash_purge(30)
     entries = _trash_list()
-    return render_template("trash.html", entries=entries, humansize=_humansize)
+    return render_template("trash.html", entries=entries)
 
 
 @app.route("/trash/raw/<path:subpath>")