feat: batch video upscaling with folder upload, directory save, and result comparison (#1051)

* feat: support batch video upscaling with folder upload and directory save

- Add multi-file selection and entire folder upload (webkitdirectory)
- Support drag & drop of both files and folders via FileSystemEntry API
- Add save directory picker using File System Access API (showDirectoryPicker)
- Process videos sequentially with per-file progress and status tracking
- Add right-side result list with click-to-compare functionality
- Add per-video duration and total batch duration display
- Add retry button for failed items with error detail display
- Remove auto-play on comparison viewer load
- Fix worker error handling: handle "error" command to reject stale promises
- Fix event listener accumulation in video comparison (AbortController)
- Fix XSS risk by escaping HTML in all innerHTML injections
- Fix URL revocation timing in download to prevent large file truncation
- Extract writeToSaveDirectory and truncateName helpers to reduce duplication
- Add Usage Guide panel explaining single/multiple/folder upload options

Files changed:
  docs/upscaler/index.html  (+1110/-181)
  docs/upscaler/upscaler.js (+110)

* fix: prevent auto-play and resource consumption during upscaling

- Set preload="metadata" on preview and comparison video elements
- Explicitly pause preview video after setting src in showVideoPreview
- Remove preview video seek sync from batch processing progress callbacks
  (was causing continuous decode during upscaling, wasting GPU resources)
- Remove preview video seek sync from retry progress callback
- All videos now require manual play; no background resource usage

* fix: improve upscaled video quality with higher bitrate and codec support

- Raise base bitrate from 2.5 Mbps (25e5) to 8 Mbps (8e6) for standard and
  firefox processors, preventing quality loss when source videos have high
  bitrates (e.g. 720p @ 16.7 Mbps was producing 1440p @ 10 Mbps, smaller
  than the original file)
- Double the bitrate for mediabunny processor (X.n1 * 2) to account for the
  4x pixel increase from 2x upscaling
- Add H.264 Level 5.1 (avc1.640033) and Level 5.2 (avc1.640034) codecs to
  the fallback lists, since Level 4.0 (avc1.640028, ~24.6 Mbps) cannot
  support the higher bitrates for 1440p+ outputs
- Add latencyMode: "quality" to VideoEncoder configs for both standard and
  firefox processors, prioritizing encoding quality over latency (suitable
  for offline processing)

* feat: add video data comparison panel for original vs upscaled metrics

- Add a comparison data table below the file info bar showing 6 metrics:
  Resolution, File Size, Duration, Est. Bitrate, Pixels, Process Time
- Display per-metric change percentage with color-coded indicators:
  green (↑) for improvements, red (↓) for regressions, gray for neutral
- Estimated bitrate calculated from file size × 8 / video duration
- Table renders after both original and upscaled video metadata loads
- Auto-hide panel on reset

* fix: make video data comparison panel full-width and responsive

- Move comparison data table from inside the left column to the full-width
  area below the left/right layout, so it is no longer constrained by the
  comparison viewer column width
- Remove table-fixed colgroup and overflow-x-auto that caused horizontal
  scrolling on smaller screens
- Table now uses w-full auto-layout, displaying all 4 columns (Metric,
  Original, Upscaled, Change) without requiring horizontal scrolling

---------

Co-authored-by: rionzhao <rionzhao@tencent.com>

assets/js/vs/editor/editor.main.nls.js

@@ -0,0 +1,11 @@
+/*!-----------------------------------------------------------
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Version: 0.30.1(829382514cb1065f5ebb90f436e1c6103e153953)
+ * Released under the MIT license
+ * https://github.com/microsoft/vscode/blob/main/LICENSE.txt
+ *-----------------------------------------------------------*/define("vs/editor/editor.main.nls",{"vs/base/browser/ui/actionbar/actionViewItems":["{0} ({1})"],"vs/base/browser/ui/findinput/findInput":["input"],"vs/base/browser/ui/findinput/findInputCheckboxes":["Match Case","Match Whole Word","Use Regular Expression"],"vs/base/browser/ui/findinput/replaceInput":["input","Preserve Case"],"vs/base/browser/ui/iconLabel/iconLabelHover":["Loading..."],"vs/base/browser/ui/inputbox/inputBox":["Error: {0}","Warning: {0}","Info: {0}","for history"],"vs/base/browser/ui/keybindingLabel/keybindingLabel":["Unbound"],"vs/base/browser/ui/menu/menu":["{0} ({1})"],"vs/base/browser/ui/tree/abstractTree":["Clear","Disable Filter on Type","Enable Filter on Type","No elements found","Matched {0} out of {1} elements"],"vs/base/common/actions":["(empty)"],"vs/base/common/errorMessage":["{0}: {1}","A system error occurred ({0})","An unknown error occurred. 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Press {0} for options."],"vs/editor/browser/core/keybindingCancellation":["Whether the editor runs a cancellable operation, e.g. like 'Peek References'"],"vs/editor/browser/editorExtensions":["&&Undo","Undo","&&Redo","Redo","&&Select All","Select All"],"vs/editor/browser/widget/codeEditorWidget":["The number of cursors has been limited to {0}."],"vs/editor/browser/widget/diffEditorWidget":["Line decoration for inserts in the diff editor.","Line decoration for removals in the diff editor.","Cannot compare files because one file is too large."],"vs/editor/browser/widget/diffReview":["Icon for 'Insert' in diff review.","Icon for 'Remove' in diff review.","Icon for 'Close' in diff review.","Close","no lines changed","1 line changed","{0} lines changed","Difference {0} of {1}: original line {2}, {3}, modified line {4}, {5}","blank","{0} unchanged line {1}","{0} original line {1} modified line {2}","+ {0} modified line {1}","- {0} original line {1}","Go to Next Difference","Go to Previous Difference"],"vs/editor/browser/widget/inlineDiffMargin":["Copy deleted lines","Copy deleted line","Copy changed lines","Copy changed line","Copy deleted line ({0})","Copy changed line ({0})","Revert this change","Copy deleted line ({0})","Copy changed line ({0})"],"vs/editor/common/config/commonEditorConfig":["Editor","The number of spaces a tab is equal to. 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UsLine truncated
+ - Use 0 to automatically compute the line height from the font size.
+ - Values between 0 and 8 will be used as a multiplier with the font size.
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Line truncated
+
+//# sourceMappingURL=../../../min-maps/vs/editor/editor.main.nls.js.map