M4: Combine files in its own tab, with a sortable table and unlocking of protected files (#321)

* M4: Combine files in its own tab, with a sortable table and unlocking of protected files

Combine files was a modal dialog with a cramped list and up/down buttons on
every row. It is now a tab next to Home and the documents, showing a table
of the files: File name | Pages | Size | Modified | Warnings.

- Columns sort when their heading is clicked (anywhere in the cell; again to
  reverse; names in natural order), resize from their edges and move by
  dragging the heading. Order and widths are kept in the settings; a
  right-click on a heading resets them.
- Rows select like a file manager (click, Ctrl/Cmd+click, Shift+click,
  Shift+arrows, Ctrl/Cmd+A). One toolbar moves, removes and unlocks the
  selection; Alt+arrows and dragging move it too. Every change to the list
  undoes and redoes with Cmd/Ctrl+Z (also toolbar buttons).
- Add files, Add folder, Add folder and subfolders (a split button), Add open
  documents, or drop files and folders on the tab.
- Problems show before Combine: password-protected files, security settings
  that withhold page assembly, page ranges (checked as typed, with the pages
  they take), duplicates. Files that open but are protected say that the
  combined file won't keep their security; the result is never encrypted.
- Unlock... asks for a file's open or permissions password (one password can
  be tried on several files). Passwords stay in memory, are never printed,
  and reach the engine through combine_unlocked; doc_combine takes them as
  `passwords`. The engine decides whether a password works, since the
  inspector rejects some it accepts (RC4 owner passwords).

organize.combine-sort is shipped and organize.combine-options partial
(include open files). Strings are translated for es, fr, ja, zh-hans, zh-hant.

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

* Credit Marlon Konrad (mlkonrad) in the About window

Adds my own entry to contributors/people.toml, as docs/contributors.md asks.

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

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>

parity/acrobat-features.toml

@@ -2890,8 +2890,8 @@ milestone = "M4"
 status = "shipped"
 commands = ["page.combine"]
 tools = ["doc_combine"]
-evidence = ["crates/organize/src/tests.rs::combine_concatenates_with_a_bookmark_per_file", "crates/ui-egui/tests/editing.rs::combining_files_opens_a_new_unsaved_tab", "crates/automation/tests/automation.rs::combine_extract_and_split"]
-notes = ""
+evidence = ["crates/organize/src/tests.rs::combine_concatenates_with_a_bookmark_per_file", "crates/ui-egui/tests/editing.rs::combining_files_opens_a_new_unsaved_tab", "crates/ui-egui/tests/editing.rs::combine_files_opens_in_its_own_tab", "crates/ui-egui/tests/editing.rs::combine_lists_size_and_warns_before_combining", "crates/ui-egui/tests/editing.rs::a_password_protected_file_is_unlocked_with_its_password_and_combined", "crates/ui-egui/tests/editing.rs::a_folder_adds_its_pdfs_in_order_and_optionally_its_subfolders", "crates/ui-egui/tests/ui.rs::pdfs_dropped_on_the_combine_tab_join_its_list", "crates/automation/tests/automation.rs::combine_extract_and_split", "crates/automation/tests/automation.rs::combine_opens_protected_files_with_their_passwords"]
+notes = "Combine files is its own tab: a table of the files (name, pages, size, modified, warnings) with column sorting, resizing and moving; files, folders (with subfolders) and open documents can be added, or dropped on the tab. Problems show before Combine (password, security settings that withhold page assembly, bad page ranges, duplicates); protected files are unlocked with their open or permissions password (also doc_combine passwords). The result is never encrypted, and is not yet offered for protection in the same step."
 
 [[feature]]
 id = "organize.combine-bookmarks"
@@ -2915,7 +2915,7 @@ status = "shipped"
 commands = ["page.combine"]
 tools = ["doc_combine"]
 evidence = ["crates/ui-egui/tests/editing.rs::combine_files_takes_chosen_pages_in_the_order_listed", "crates/automation/tests/automation.rs::combine_extract_and_split"]
-notes = "Combine files list: order (move up/down), remove, add files, a page range per file (such as 1-3, 6; in the order given); bookmarks to left-out pages lose their destination"
+notes = "A page range per file (such as 1-3, 6; in the order given), checked as it is typed, with the page count it takes; bookmarks to left-out pages lose their destination"
 
 [[feature]]
 id = "organize.combine-sort"
@@ -2923,11 +2923,11 @@ title = "Sort and reorder files before combining"
 area = "D"
 tier = "P2"
 milestone = "M4"
-status = "planned"
-commands = []
-tools = []
-evidence = []
-notes = ""
+status = "shipped"
+commands = ["page.combine"]
+tools = ["doc_combine"]
+evidence = ["crates/ui-egui/tests/editing.rs::column_headings_sort_the_list_and_flip_on_the_second_click", "crates/ui-egui/tests/editing.rs::ctrl_and_shift_clicks_select_several_files_that_move_and_go_together", "crates/ui-egui/tests/editing.rs::undo_and_redo_restore_the_combine_list", "crates/automation/tests/automation.rs::combine_extract_and_split"]
+notes = "Sort by any column (name in natural order, pages, size, modified, warnings), ascending or descending; multi-select (Ctrl/Shift) and move up/down, Alt+arrows or drag; every change undoable. doc_combine combines in the order its paths are given."
 
 [[feature]]
 id = "organize.combine-options"
@@ -2935,11 +2935,11 @@ title = "Combine options (file size, convert to PDF/A, include open files)"
 area = "D"
 tier = "P2"
 milestone = "M11"
-status = "planned"
-commands = []
+status = "partial"
+commands = ["page.combine"]
 tools = []
-evidence = []
-notes = ""
+evidence = ["crates/ui-egui/tests/editing.rs::open_documents_can_be_added_to_combine"]
+notes = "Include open files: Add open documents (with their unsaved changes). Missing: file-size options and converting the result to PDF/A."
 
 [[feature]]
 id = "organize.resource-dedupe"