[VDS] Drive folder and preview widgets from the model (#7106)

* [VDS] Drive folder and preview widgets from the model (MVC views)

Took 16 minutes

Took 8 minutes

Took 3 minutes


Took 11 minutes

* Rebase whoopsie

Took 4 minutes

* Hide widgets instead of destroying, go back to signals, rename for consistency.

Took 13 minutes

Took 4 seconds

Took 26 minutes

Took 5 seconds

# Commit time for manual adjustment:
# Took 9 minutes

* Make VDS startup smooth: batch deck loads, guard preview resizes

- Move color identity computation into the background load task and apply
  finished deck loads in bounded batches per event loop turn, so finishing
  hundreds of loads at once cannot stall the UI thread
- Skip redundant resize work in DeckPreviewWidget when the banner width did
  not change, and collect the clamped children once instead of searching the
  widget tree on every layout pass

Took 19 minutes

# Commit time for manual adjustment:
# Took 3 minutes

* [VDS] Expose filter matches as a proxy role instead of dropping rows

The folder display scanned source-model rows and probed acceptance with
mapFromSource(...).isValid(), reaching into both models for one answer.

The proxy now keeps every row and exposes each row's search/tag/color
filter result through FilterMatchRole. The folder display and the tag
filter read everything off proxy indexes, and hidden previews keep their
sorted position in the flow layout instead of being appended at the end.

Took 11 minutes

* [VDS] Bound pending-load drain by time and make row lookups O(1)

The fixed DECK_LOADS_PER_TURN = 24 cap had no measured basis. It was guessed and existed
because every applied load emitted dataChanged into each DeckPreviewWidget,
whose handler resolved its own row with an O(n) linear scan per widget.

The model now maintains a file path -> row hash kept in sync across scans,
renames and deletions, so rowForFilePath is O(1) and the fan-out cost is
gone at its source. The drain applies finished loads until a small time
budget per event loop turn runs out, so throughput self-tunes instead of
relying on an arbitrary count.

* Actual minimal fix for resize squishing

Took 20 minutes

* Fix color widget sizing

Took 16 minutes

* [BannerWidget] Also set a max height

Took 4 minutes

---------

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

cockatrice/src/game_graphics/deckview/deck_view_container.cpp

@@ -9,6 +9,7 @@
 #include "../../interface/widgets/dialogs/dlg_load_deck_from_website.h"
 #include "../../interface/widgets/dialogs/dlg_load_remote_deck.h"
 #include "../../interface/widgets/tabs/tab_game.h"
+#include "../../interface/widgets/visual_deck_storage/visual_deck_storage_widget.h"
 #include "deck_view.h"
 
 #include <QMessageBox>