GUI table sorts compare formatted display strings instead of numeric fields

[rezdm]

Problem

Several sort comparators in src/ui/imgui/imgui_details_tabs.cpp compare the human-readable display string instead of the numeric field that's already available on the struct:

• Memory maps "Size" column (line ~421): `a.size.compare(b.size)` — compares strings like "100 KB" vs "2 MB" lexicographically ('1' < '2' as characters), giving visibly wrong ordering. `MemoryMapInfo::size_bytes` (the authoritative numeric value) exists and isn't used here.
• Libraries "Base Address" column (line ~534): `a.base_address.compare(b.base_address)` — currently happens to sort correctly everywhere I checked because the hex string is fixed-width zero-padded (e.g. `{:016x}`), making lexicographic order coincide with numeric order, but it's fragile and should use `LibraryInfo::base_addr` (numeric) on principle.
• Threads "TID" column (line ~293): `a.tid - b.tid` — subtraction-based compare can overflow for large/negative TIDs. This is a real, not just theoretical, risk: see the linked macOS TID-truncation issue, where thread IDs can already be negative.

Fix

Switch all three comparators to compare the numeric field directly with a proper three-way compare (`(a < b) ? -1 : (a > b) ? 1 : 0`, matching the pattern already used correctly elsewhere in the same file, e.g. Network's port columns).