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/basic-languages/mysql/mysql.js

@@ -0,0 +1,7 @@
+/*!-----------------------------------------------------------------------------
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * monaco-languages version: 0.30.1(5a7ba61be909ae9e4889768a3453ebb0dec392e2)
+ * Released under the MIT license
+ * https://github.com/Microsoft/monaco-languages/blob/master/LICENSE.md
+ *-----------------------------------------------------------------------------*/
+define("vs/basic-languages/mysql/mysql",["require","exports"],(function(T,E){"use strict";Object.defineProperty(E,"__esModule",{value:!0}),E.language=E.conf=void 0,E.conf={comments:{lineComment:"--",blockComment:["/*","*/"]},brackets:[["{","}"],["[","]"],["(",")"]],autoClosingPairs:[{open:"{",close:"}"},{open:"[",close:"]"},{open:"(",close:")"},{open:'"',close:'"'},{open:"'",close:"'"}],surroundingPairs:[{open:"{",close:"}"},{open:"[",close:"]"},{open:"(",close:")"},{open:'"',close:'"'},{open:"'",close:"'"}]},E.language={defaultToken:"",tokenPostfix:".sql",ignoreCase:!0,brackets:[{open:"[",close:"]",token:"delimiter.square"},{open:"(",close:")",token:"delimiter.parenthesis"}],keywords:["ACCESSIBLE","ADD","ALL","ALTER","ANALYZE","AND","AS","ASC","ASENSITIVE","BEFORE","BETWEEN","BIGINT","BINARY","BLOB","BOTH","BY","CALL","CASCADE","CASE","CHANGE","CHAR","CHARACTER","CHECK","COLLATE","COLUMN","CONDITION","CONSTRAINT","CONTINUE","CONVERT","CREATE","CROSS","CUBE","CUME_DIST","CURRENT_DATE","CURRENT_TIME","CURRENT_TIMESTAMP","CURRENT_USER","CURSOR","DATABASE","DATABASES","DAY_HOUR","DAY_MICROSECOND","DAY_MINUTE","DAY_SECOND","DEC","DECIMAL","DECLARE","DEFAULT","DELAYED","DELETE","DENSE_RANK","DESC","DESCRIBE","DETERMINISTIC","DISTINCT","DISTINCTROW","DIV","DOUBLE","DROP","DUAL","EACH","ELSE","ELSEIF","EMPTY","ENCLOSED","ESCAPED","EXCEPT","EXISTS","EXIT","EXPLAIN","FALSE","FETCH","FIRST_VALUE","FLOAT","FLOAT4","FLOAT8","FOR","FORCE","FOREIGN","FROM","FULLTEXT","FUNCTION","GENERATED","GET","GRANT","GROUP","GROUPING","GROUPS","HAVING","HIGH_PRIORITY","HOUR_MICROSECOND","HOUR_MINUTE","HOUR_SECOND","IF","IGNORE","IN","INDEX","INFILE","INNER","INOUT","INSENSITIVE","INSERT","INT","INT1","INT2","INT3","INT4","INT8","INTEGER","INTERVAL","INTO","IO_AFTER_GTIDS","IO_BEFORE_GTIDS","IS","ITERATE","JOIN","JSON_TABLE","KEY","KEYS","KILL","LAG","LAST_VALUE","LATERAL","LEAD","LEADING","LEAVE","LEFT","LIKE","LIMIT","LINEAR","LINES","LOAD","LOCALTIME","LOCALTIMESTAMP","LOCK","LONG","LONGBLOB","LONGTEXT","LOOP","LOW_PRIORITY","MASTER_BIND","MASTER_SSL_VERIFY_SERVER_CERT","MATCH","MAXVALUE","MEDIUMBLOB","MEDIUMINT","MEDIUMTEXT","MIDDLEINT","MINUTE_MICROSECOND","MINUTE_SECOND","MOD","MODIFIES","NATURAL","NOT","NO_WRITE_TO_BINLOG","NTH_VALUE","NTILE","NULL","NUMERIC","OF","ON","OPTIMIZE","OPTIMIZER_COSTS","OPTION","OPTIONALLY","OR","ORDER","OUT","OUTER","OUTFILE","OVER","PARTITION","PERCENT_RANK","PRECISION","PRIMARY","PROCEDURE","PURGE","RANGE","RANK","READ","READS","READ_WRITE","REAL","RECURSIVE","REFERENCES","REGEXP","RELEASE","RENAME","REPEAT","REPLACE","REQUIRE","RESIGNAL","RESTRICT","RETURN","REVOKE","RIGHT","RLIKE","ROW","ROWS","ROW_NUMBER","SCHEMA","SCHEMAS","SECOND_MICROSECOND","SELECT","SENSITIVE","SEPARATOR","SET","SHOW","SIGNAL","SMALLINT","SPATIAL","SPECIFIC","SQL","SQLEXCEPTION","SQLSTATE","SQLWARNING","SQL_BIG_RESULT","SQL_CALC_FOUND_ROWS","SQL_SMALL_RESULT","SSL","STARTING","STORED","STRAIGHT_JOIN","SYSTEM","TABLE","TERMINATED","THEN","TINYBLOB","TINYINT","TINYTEXT","TO","TRAILING","TRIGGER","TRUE","UNDO","UNION","UNIQUE","UNLOCK","UNSIGNED","UPDATE","USAGE","USE","USING","UTC_DATE","UTC_TIME","UTC_TIMESTAMP","VALUES","VARBINARY","VARCHAR","VARCHARACTER","VARYING","VIRTUAL","WHEN","WHERE","WHILE","WINDOW","WITH","WRITE","XOR","YEAR_MONTH","ZEROFILL"],operators:["AND","BETWEEN","IN","LIKE","NOT","OR","IS","NULL","INTERSECT","UNION","INNER","JOIN","LEFT","OUTER","RIGHT"],builtinFunctions:["ABS","ACOS","ADDDATE","ADDTIME","AES_DECRYPT","AES_ENCRYPT","ANY_VALUE","Area","AsBinary","AsWKB","ASCII","ASIN","AsText","AsWKT","ASYMMETRIC_DECRYPT","ASYMMETRIC_DERIVE","ASYMMETRIC_ENCRYPT","ASYMMETRIC_SIGN","ASYMMETRIC_VERIFY","ATAN","ATAN2","ATAN","AVG","BENCHMARK","BIN","BIT_AND","BIT_COUNT","BIT_LENGTH","BIT_OR","BIT_XOR","Buffer","CAST","CEIL","CEILING","Centroid","CHAR","CHAR_LENGTH","CHARACTER_LENGTH","CHARSET","COALESCE","COERCIBILITY","COLLATION","COMPRESS","CONCAT","CONCAT_WS","CONNECTION_ID","Contains","CONV","CONVERT","CONVERT_TZ","ConvexHull","COS","COT","COUNT","CRC32","CREATE_ASYMMETRIC_PRIV_KEY","CREATE_ASYMMETRIC_PUB_KEY","CREATE_DH_PARAMETERS","CREATE_DIGEST","Crosses","CURDATE","CURRENT_DATE","CURRENT_TIME","CURRENT_TIMESTAMP","CURRENT_USER","CURTIME","DATABASE","DATE","DATE_ADD","DATE_FORMAT","DATE_SUB","DATEDIFF","DAY","DAYNAME","DAYOFMONTH","DAYOFWEEK","DAYOFYEAR","DECODE","DEFAULT","DEGREES","DES_DECRYPT","DES_ENCRYPT","Dimension","Disjoint","Distance","ELT","ENCODE","ENCRYPT","EndPoint","Envelope","Equals","EXP","EXPORT_SET","ExteriorRing","EXTRACT","ExtractValue","FIELD","FIND_IN_SET","FLOOR","FORMAT","FOUND_ROWS","FROM_BASE64","FROM_DAYS","FROM_UNIXTIME","GeomCollFromText","GeometryCollectionFromText","GeomCollFromWKB","GeometryCollectionFromWKB","GeometryCollection","GeometryN","GeometryType","GeomFromText","GeometryFromText","GeomFromWKB","GeometryFromWKB","GET_FORMAT","GET_LOCK","GLength","GREATEST","GROUP_CONCAT","GTID_SUBSET","GTID_SUBTRACT","HEX","HOUR","IF","IFNULL","INET_ATON","INET_NTOA","INET6_ATONLine truncated