Make posts table scrollable and fix file-finder to ignore non-export files

- All Posts table now scrolls within a fixed height instead of paginating/
  growing indefinitely as more posts accumulate, with column widths tuned
  so Short title gets the most room and narrow columns (dates, rates,
  counts) stay compact.
- _find_latest_file/_find_all_files now only match real LinkedIn export
  filenames (txproducts_*), so unrelated files sitting in the same folder
  (a manual roster, an Office lock file) can no longer crash the loader.

.gitignore

@@ -12,3 +12,4 @@ __pycache__/
 
 # OS
 .DS_Store
+manual_followers_list_*

app.py

@@ -103,9 +103,21 @@ def mark_posts(fig, fts_df, posts_df):
     return fig
 
 
+def _is_linkedin_export(fname, keyword, extensions):
+    """True only for real LinkedIn export files (e.g. txproducts_followers_<id>.xls) —
+    excludes unrelated files that happen to contain the keyword (like a manually-built
+    roster) and Office lock files (~$...) left behind by a file currently open in Excel."""
+    lower = fname.lower()
+    if lower.startswith("~$") or lower.startswith("."):
+        return False
+    if not lower.startswith("txproducts_"):
+        return False
+    return keyword.lower() in lower and lower.endswith(extensions)
+
+
 def _find_latest_file(keyword, extensions=(".xls", ".xlsx")):
-    """Most recently modified file across DATA_DIR and UPLOAD_DIR whose name contains
-    `keyword` (case-insensitive) — replaces matching one exact hardcoded filename, so any
+    """Most recently modified real LinkedIn export across DATA_DIR and UPLOAD_DIR whose
+    name contains `keyword` — replaces matching one exact hardcoded filename, so any
     correctly-named LinkedIn export (including freshly uploaded ones) is picked up without
     needing the file's exact auto-generated export ID."""
     candidates = []
@@ -113,7 +125,7 @@ def _find_latest_file(keyword, extensions=(".xls", ".xlsx")):
         if not os.path.isdir(folder):
             continue
         for fname in os.listdir(folder):
-            if keyword.lower() in fname.lower() and fname.lower().endswith(extensions):
+            if _is_linkedin_export(fname, keyword, extensions):
                 candidates.append(os.path.join(folder, fname))
     if not candidates:
         raise FileNotFoundError(
@@ -130,7 +142,7 @@ def _find_all_files(keyword, extensions=(".xls", ".xlsx")):
         if not os.path.isdir(folder):
             continue
         for fname in os.listdir(folder):
-            if keyword.lower() in fname.lower() and fname.lower().endswith(extensions):
+            if _is_linkedin_export(fname, keyword, extensions):
                 candidates.append(os.path.join(folder, fname))
     return sorted(set(candidates), key=os.path.getmtime)
 
@@ -494,14 +506,29 @@ def refresh_data():
                 id="posts-table",
                 data=_posts_table_df.to_dict("records"),
                 columns=[{"name": c, "id": c} for c in post_table_cols],
-                page_size=20,
-                style_table={"overflowX": "auto"},
+                page_action="none",
+                fixed_rows={"headers": True},
+                style_table={"overflowX": "auto", "overflowY": "auto", "maxHeight": "260px"},
                 style_header={"backgroundColor": "#f0f4f8", "color": "#333", "fontWeight": "bold", "border": "1px solid #ccc",
-                              "fontSize": "11px", "padding": "3px 6px", "height": "22px", "lineHeight": "16px"},
+                              "fontSize": "11px", "padding": "3px 6px", "height": "22px", "lineHeight": "16px",
+                              "whiteSpace": "nowrap", "overflow": "hidden", "textOverflow": "ellipsis"},
                 style_cell={"backgroundColor": "#ffffff", "color": "#333", "border": "1px solid #e0e0e0",
                             "fontSize": "11px", "padding": "3px 6px", "height": "22px", "lineHeight": "16px",
-                            "textAlign": "left",
+                            "textAlign": "left", "whiteSpace": "nowrap",
                             "maxWidth": "300px", "overflow": "hidden", "textOverflow": "ellipsis"},
+                style_cell_conditional=[
+                    {"if": {"column_id": "Short title"}, "minWidth": "250px", "maxWidth": "none"},
+                    {"if": {"column_id": "Created date"}, "width": "95px", "minWidth": "95px", "maxWidth": "95px"},
+                    {"if": {"column_id": "Post type"}, "width": "75px", "minWidth": "75px", "maxWidth": "75px"},
+                    {"if": {"column_id": "Content Type"}, "width": "100px", "minWidth": "100px", "maxWidth": "100px"},
+                    {"if": {"column_id": "Impressions"}, "width": "85px", "minWidth": "85px", "maxWidth": "85px"},
+                    {"if": {"column_id": "Clicks"}, "width": "60px", "minWidth": "60px", "maxWidth": "60px"},
+                    {"if": {"column_id": "Eng %"}, "width": "60px", "minWidth": "60px", "maxWidth": "60px"},
+                    {"if": {"column_id": "CTR %"}, "width": "60px", "minWidth": "60px", "maxWidth": "60px"},
+                    {"if": {"column_id": "Likes"}, "width": "60px", "minWidth": "60px", "maxWidth": "60px"},
+                    {"if": {"column_id": "Comments"}, "width": "70px", "minWidth": "70px", "maxWidth": "70px"},
+                    {"if": {"column_id": "Reposts"}, "width": "70px", "minWidth": "70px", "maxWidth": "70px"},
+                ],
                 style_data_conditional=post_highlight_styles,
                 tooltip_data=[{c: {"value": str(row[c]), "type": "markdown"} for c in post_table_cols}
                               for row in _posts_table_df.to_dict("records")],