Mail merge: .xls recipients, legacy encodings, Filter and Sort (#778) (#885)

* #778: .xls and legacy-encoding recipient lists; filter and sort recipients

- Recipient lists: legacy Excel 97-2003 .xls (BIFF8 reader on the cfb crate already in the
  tree); Excel 5.0/95 and password-protected .xls refused with a clear message; a CSV named
  .xls reads as text, an HTML one gets an error. .xls added to the picker filters (desktop,
  web, built-in browser) and drop handling.
- Text lists (and plain-text import) detect legacy encodings when not UTF-8/UTF-16: GBK/GB18030,
  Big5, Shift_JIS, EUC-KR, Windows code pages (encoding_rs + chardetng, MIT/Apache); an
  `encoding` param overrides.
- mailings.filterRecipients / mailings.sortRecipients: field, comparison (equal, notEqual,
  less, greater, lessOrEqual, greaterOrEqual, blank, notBlank, contains, notContains), value,
  And/Or joins; sort keys. Preview, Finish & Merge and labels use only the matching records
  in sort order. Edit Recipient List edits every record and keeps the filter.
- Recipient List dialog: Filter and Sort section and a merge-order column; catalog rows;
  strings in every catalog; docs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* i18n: Hungarian and French strings for this change

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Review fixes for #885: total order for recipient sort, Bulgarian strings

- compare_cells now ranks numbers (compared numerically) before text (compared
  case-insensitively), so it is a total order; a column mixing 9, 10 and 1a
  could make slice::sort_by panic. Regression test sorts mixed columns.
- Bulgarian catalog: the 24 Filter and Sort strings.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* vi: mail merge Filter and Sort strings

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Dmitrii Khlapov <19991457+dkhlapov@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>

Cargo.lock

@@ -693,6 +693,17 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "chardetng"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "13de944a44b5064ee5d3a5ceccc49a41bfec50f2580e66f82e87703acdb88b53"
+dependencies = [
+ "cfg-if",
+ "encoding_rs",
+ "memchr",
+]
+
 [[package]]
 name = "cipher"
 version = "0.5.2"
@@ -819,6 +830,12 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "core_detect"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f8f80099a98041a3d1622845c271458a2d73e688351bf3cb999266764b81d48"
+
 [[package]]
 name = "core_maths"
 version = "0.1.1"
@@ -1184,6 +1201,20 @@ dependencies = [
  "bytemuck",
 ]
 
+[[package]]
+name = "encoding_rs"
+version = "0.8.42"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e985e0451871ad22fb8d2b6b076e2028a502a0d3950998c2c5c0a4f9b5d9679"
+dependencies = [
+ "cfg-if",
+ "core_detect",
+ "multiversion_no_op",
+ "rustversion",
+ "scopeguard",
+ "simdutf8",
+]
+
 [[package]]
 name = "endi"
 version = "1.1.1"
@@ -2363,6 +2394,12 @@ dependencies = [
  "pxfm",
 ]
 
+[[package]]
+name = "multiversion_no_op"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "743fb55ba31b18fb1ecef6bdc9aa2743314978ac084044301a7eee33fb99a20d"
+
 [[package]]
 name = "naga"
 version = "30.0.1"
@@ -5198,6 +5235,7 @@ dependencies = [
 name = "wordcraft-engine"
 version = "0.7.0"
 dependencies = [
+ "encoding_rs",
  "image",
  "js-sys",
  "log",
@@ -5237,6 +5275,9 @@ dependencies = [
 name = "wordcraft-formats"
 version = "0.7.0"
 dependencies = [
+ "cfb",
+ "chardetng",
+ "encoding_rs",
  "image",
  "js-sys",
  "log",