Hidden description

feat(tooltip): Implement conditional tooltip expansion with Shift key

This commit introduces a new client-side quality-of-life feature that
modifies how item tooltips are displayed in the game. When a player is
viewing an item's tooltip, a placeholder message "Hold Shift for
details..." is shown by default. Pressing and holding the Shift key
reveals the full, complete tooltip, providing an organized and clean
inventory browsing experience.

Background / Problem:

• Tooltips in Minecraft can become excessively long, especially in
  modded environments where items often carry detailed descriptions,
  enchantment information, and mod-specific metadata.
• A cluttered tooltip obstructs the player's view and makes inventory
  management cumbersome, as crucial information is always visible
  whether needed or not.
• There is currently no vanilla or standard Forge method to toggle
  tooltips or hide them behind a modifier key.

Implementation Details:

• Created a new event handler that listens to the ItemTooltipEvent
  (Forge's API event for tooltip construction).
• When the event is triggered, the handler checks the state of the
  Shift key using Screen.hasShiftDown() (client-side) to determine
  if the player is holding the key while hovering over the item.
• If the key is pressed, the original, unmodified tooltip text list
  (List) is added to the tooltip, showing every line of
  information.
• If the key is not pressed, the default tooltip is cleared and
  replaced with a single-line component: "Hold Shift for details...".
• The tooltip is automatically updated and re-rendered each time the
  player's key state changes while the item is hovered over.

Changes in Behavior:

• Players can now quickly glance at an item without being overwhelmed
  by lengthy text.
• The full tooltip is instantly revealed when needed, without any
  additional keybinds or configuration menus.
• The placeholder text is localized and can be adapted or
  internationalized by future updates.
• This feature works on all items, including those from other mods,
  because it intercepts the tooltip event at a generic level.

Testing Performed:

• Verified on Forge 1.20.1 with both vanilla and modded items (e.g.,
  items with enchantments, modded equipment).
• Confirmed that the Shift key detection works reliably in all game
  screens (inventory, creative menu, containers).
• Tested the responsiveness of the tooltip when the key is pressed,
  released, and pressed again while the mouse remains on the same
  item.
• Ensured compatibility with other mods that also modify
  ItemTooltipEvent through event priority adjustments.

Additional Notes:

• This mod is fully client-side and does not require any server-side
  installation.
• The Screen.hasShiftDown() method is used over keyBindSneak to
  accurately reflect GUI-related key presses without interfering
  with movement controls.
• Future consideration: Adding a configurable keybind to toggle this
  behavior or customize the placeholder message.

Resolves: #ISSUE-42 (Replace with actual issue ticket number if applicable)