sharing 6/7: Sharing Tab UI

[keithharvey]

📚 Stacked split of #5704 — review bottom-up

• 1/7 · Transfer library (enums, comms, serialization, test infra) (sharing 1/7: Transfer library (enums, comms, serialization, test infra) #8125)
• 2/7 · Modes & economy boundary (presets, waterfill, share ledger) (sharing 2/7: Modes & economy boundary (presets, waterfill, share ledger) #8126)
• 3/7 · Policies (context -> policy -> policy_result -> action) (sharing 3/7: Policies (context → policy → policy_result → action) #8123)
• 4/7 · Transfer runtime (controllers, economy boundary, gadget swap) (sharing 4/7: Transfer runtime (controllers, economy boundary, gadget swap) #8062)
• 5/7 · Tech Core / Keystone (sharing 5/7: Tech Core / Keystone #8063)
• 6/7 · Sharing Tab UI (sharing 6/7: Sharing Tab UI #8064) ← you are here
• 7/7 · Game modes export (export widget, headless startscript, CI workflow) (sharing 7/7: Game modes export (widget, headless startscript, CI workflow) #8095)

Warning

Review and approve here, but don't merge this PR — the whole feature lands in one GitHub-UI merge of the root PR #5704 (byte-identical to the assembled tip) once the type-migration stack (#8235) is in. Merge instructions live on #5704.

Each PR is file-partitioned: every file appears in exactly one PR in its final sharing_tab form, so each PR's diff is byte-identical to that branch. Regenerated deterministically by just bar::sharing-split.

Summary (LLM-generated, claude-opus-4-6)

Wire the PolicyResult / TeamTransfer layer into every sharing-related UI surface.

• Introduce team_transfer_unsynced.lua as the unsynced TeamTransfer facade (.Resources, .Units, .Units.ShareUnits) and unit_transfer_unsynced.lua which sends unit shares via LuaRulesMsg instead of Spring.ShareResources.
• Extract gui_advplayerslist helpers into gui_advplayerlist/policy.lua (pack/unpack PolicyResult per PolicyType into player-data rows, RepackPolicy on SharePolicyChanged), resource.lua (HandleResourceTransfer using DecideCommunicationCase), api_extensions.lua (hover-change + hover-invalid-units listener API), and gui_advplayerslist_modules.lua (column-module definitions moved out of the main widget to dodge the Lua local cap; accessed via ModuleRefs).
• In gui_advplayerslist.lua: share buttons render enabled/disabled overlays from unitPolicy.canShare and amountSendable; tooltips delegate to TeamTransfer.Units.TooltipText / ResourceTransfer.TooltipText; resource slider amounts come from policyResult.amountSendable; add SelectionChanged and SharePolicyChanged callins; hover tracking fires ApiExtensions.HandleHoverChange so invalid units are communicated to the selection-highlight widget.
• In gui_selectedunits_gl4.lua + shaders: pipe a g_invalid varying from v_parameters.y through geom/vert/frag; units flagged invalid for the hovered receiver render with a red highlight; subscribe to AddHoverInvalidUnitsListener from the player-list API.
• In gui_top_bar.lua: gate share-slider visibility on GetCachedPolicyResult(...).canShare; read ShareStats for sent/received; re-evaluate policy each tick so tech-unlocks show immediately. In gui_chat.lua: switch chat-message param protocol to positional :key:value pairs with explicit resourceType; use SendTransferChatMessageProtocolHighlights for coloring; skip UnitTaken logging when isTakeInProgress. In gui_teamstats.lua: overlay ShareStats.Read onto engine history for sent/received. Register SharePolicyChanged callin in barwidgets.lua.
• Expand interface.json sharing tooltips into structured base/tech objects with disabled, allInvalid, buildDelay, stunDelay, invalid (pluralised) variants; add techBlocking and unitSharingMode i18n sections; add tech2TeamLost/tech3TeamLost tip keys. Add cmd_take.lua widget forwarding /take to synced gadget.

[github-actions]

Integration Test Results

18 tests  ±0   9 ✅ ±0   20s ⏱️ -1s
 1 suites ±0   8 💤 ±0 
 1 files   ±0   1 ❌ ±0 

For more details on these failures, see this check.

Results for commit 6c0061d. ± Comparison against base commit 20fd02b.

♻️ This comment has been updated with latest results.