Add inventory exclude filter (keep items from being dumped to stash) - #10

Adds a small window next to the inventory panel with a text box that keeps matching items from being dumped to the stash via the dump button or hotkeys.

Features

• Terms are matched case-insensitively against the item metadata path and RenderName (some items have no render name, so metadata is the primary key)
• Press Enter to save a term; saved terms show as click-to-remove chips and collapse into a Filters (N) popout when there are more than 2 (same UX as MapNotify's search bar)
• Text still in the input box acts as a live filter preview before saving
• Matching items get a colored highlight frame (color picker in the window and in settings, gold by default), reusing the existing thickness/rounding/deflation settings
• Hovering a highlighted item shows its metadata path as a tooltip, with a configurable X/Y offset so it can be kept clear of the game tooltip
• Toggles to hide the highlight frame and/or the tooltip — exclusion still applies when they are off
• Saved terms and all settings persist across restarts
• Excluded items are also removed from the IFL custom-filter highlight, so frames only show items that will actually move

Refactor

• The duplicated frame-drawing/deflation code is extracted into a shared DrawItemFrame helper

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