fix: reassign 4 tools to correct display modes

bulk-rename: before-after -> no-comparison (renaming has no visual change)
image-to-pdf: before-after -> no-comparison (format conversion, not visual)
video-to-gif: side-by-side -> media-player (input is video)
chart-maker: no-comparison -> no-dropzone (generator tool)

8 tools targeting custom-results skipped: ocr, barcode-read, favicon,
auto-subtitles, video-to-frames, color-palette, info, histogram lack
ResultsPanel components and would crash at runtime.

apps/web/src/lib/tool-display-modes.ts

@@ -74,9 +74,9 @@ export const TOOL_DISPLAY_MODES: Record<string, DisplayMode> = {
   "gif-tools": "before-after",
 
   // Optimization extras
-  "bulk-rename": "before-after",
+  "bulk-rename": "no-comparison",
   favicon: "before-after",
-  "image-to-pdf": "before-after",
+  "image-to-pdf": "no-comparison",
   "optimize-for-web": "before-after",
   "pdf-to-image": "custom-results",
 
@@ -112,7 +112,7 @@ export const TOOL_DISPLAY_MODES: Record<string, DisplayMode> = {
   "compress-video": "media-player",
   "trim-video": "media-player",
   "mute-video": "media-player",
-  "video-to-gif": "side-by-side",
+  "video-to-gif": "media-player",
   "resize-video": "media-player",
   "crop-video": "media-player",
   "rotate-video": "media-player",
@@ -193,7 +193,7 @@ export const TOOL_DISPLAY_MODES: Record<string, DisplayMode> = {
   "to-epub": "no-comparison",
 
   // Data tools
-  "chart-maker": "no-comparison",
+  "chart-maker": "no-dropzone",
   "csv-excel": "no-comparison",
   "csv-json": "no-comparison",
   "json-xml": "no-comparison",