Add Move/Copy/Symlink rename actions, with undo support for all three

- renamr-core::rename: new RenameAction enum (Move/Copy/Symlink, default Move,
  mirroring net.filebot.cli.CmdlineOperations's --action modes). execute_renames() now
  takes an action applied to the whole batch. Copy uses fs::copy (source untouched);
  Symlink uses std::os::unix::fs::symlink / std::os::windows::fs::symlink_file behind a
  cfg(unix)/cfg(windows) split. Same conflict policy (skip, never overwrite) and
  auto-created destination folders apply to all three actions. 8 new tests.
- renamr-core::history: HistoryBatch now records which action produced it
  (#[serde(default)] so old history.json entries - all implicitly Move - still
  deserialize). revert_one() branches on it: Move still moves the file back; Copy/
  Symlink undo by deleting the copy/symlink (using symlink_metadata so a broken link is
  still recognized as present and removable) - the original was never touched by those
  actions, so there's nothing to move back. 3 new tests.
- src-tauri: execute_rename command takes the chosen action and threads it through to
  both execute_renames and record_batch.
- Frontend: a Move/Copy/Symlink segmented selector in the "Confirm Rename" modal
  (remembered across modal opens, defaults to Move), action-aware subtitle/button
  copy, and a status message using the right verb (Renamed/Copied/Symlinked). Only Move
  reconciles a loaded item's id/name/bindings to the new path afterward, since Copy/
  Symlink leave the source file exactly where it was. History panel now shows a Copy/
  Symlink badge on non-Move batches and explains what Undo does for each.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

README.md

@@ -9,14 +9,15 @@ native file/folder loading and drag-and-drop, local filename-based season/episod
 movie title/year* detection ("Match") is working, real online metadata lookups against
 TMDB ("Fetch Data") are working for both TV episodes and movies — including fuzzy
 title disambiguation, so a search that returns several similarly-named results doesn't
-just take TMDB's top-ranked hit — and the actual on-disk rename operation is wired up
+just take TMDB's top-ranked hit — and the actual on-disk operation is wired up
 (skip-on-conflict, with a confirmation step showing the full old-path/new-path plan
-before anything touches disk, and a per-row ✕ to drop an individual file from that plan
-at the last step). Rename can also organize files into subfolders —
-including ones that don't exist yet — when the naming scheme includes a `/`. Every
-completed rename is logged to a history panel that can undo it, moving files back to
-their original paths. A single loaded batch can freely mix TV episodes and movies —
-each file only fills in the fields that apply to it. Full media-metadata bindings are
+before anything touches disk, a per-row ✕ to drop an individual file from that plan at
+the last step, and a Move/Copy/Symlink selector for what to actually do at each
+target). It can also organize files into subfolders — including ones that don't exist
+yet — when the naming scheme includes a `/`. Every completed batch is logged to a
+history panel that can undo it (moving files back for Move, or just removing what was
+created for Copy/Symlink). A single loaded batch can freely mix TV episodes and movies
+— each file only fills in the fields that apply to it. Full media-metadata bindings are
 not yet ported. See "Porting roadmap" below.
 
 The naming scheme is fully user-editable from the app (the "Naming Scheme" button next
@@ -115,12 +116,12 @@ crates/renamr-core/   Pure Rust core: naming-expression engine (ported), local
                        TMDB metadata client (`web/tmdb.rs` — TV search + episode lookup
                        and movie search + lookup, both disambiguated via `similarity/`,
                        tested against a mocked HTTP server via `mockito`), the on-disk
-                       rename engine (`rename/`) —
-                       skip-on-conflict, can also organize into (auto-created)
-                       subfolders when the naming scheme includes `/` — and a rename
-                       history/undo log (`history/`, a partial `HistoryDialog` port).
-                       Not yet ported: full media metadata bindings, other web
-                       datasource clients (TVDB/AniDB/etc).
+                       rename engine (`rename/` — skip-on-conflict, Move/Copy/Symlink
+                       actions, can also organize into (auto-created) subfolders when
+                       the naming scheme includes `/`) — and a rename history/undo log
+                       (`history/`, a partial `HistoryDialog` port, undo-aware of which
+                       action produced each batch). Not yet ported: full media metadata
+                       bindings, other web datasource clients (TVDB/AniDB/etc).
                        No Tauri dependency, so it builds and unit-tests standalone.
 src-tauri/             Tauri app shell: exposes renamr-core as commands to the frontend
                        (naming-scheme rendering, filename matching for both TV and
@@ -227,9 +228,13 @@ ported from, for anyone picking this up:
    UI's Rename button behind a confirmation step) including the `move`-into-subfolder
    `--action` variant — a naming scheme like `{n}/{s00e00}` organizes files into
    subfolders, creating any missing folders automatically, always scoped to the file's
-   own directory tree. Not yet done: the `copy`/`symlink` `--action` variants, the
-   `--conflict` variants beyond skip (auto-number, override), and the CLI flag surface
-   itself.
+   own directory tree. The `copy`/`symlink` `--action` variants are done too — an action
+   selector in the confirmation modal picks Move/Copy/Symlink for the whole batch; Copy
+   and Symlink both leave the source file untouched and produce a new file/link at the
+   computed target, and both are undoable from the History panel the same as Move (undo
+   for Copy/Symlink just removes what was created, since there's nothing to move back).
+   Not yet done: the `--conflict` variants beyond skip (auto-number, override), and the
+   CLI flag surface itself.
 7. **The rest of the UI** — the Rename panel (file loading, drag-drop, live preview,
    local TV/movie matching, confirmed rename with per-item exclude, rename history/undo)
    is built; the other five sidebar panels (Episodes/Subtitles/SFV/Filter/List) are