Add Use Spot Overlay and Target Capture Bar functionality

- Introduced `StageUseTargetCaptureBar` class for managing user interactions with props and their use spots.
- Implemented UI elements including buttons for changing props and canceling actions.
- Added `PropUseSpotData` class for validation and serialization of prop use spots.
- Created tests for validating use spot data migration, serialization, and rule matching.
- Ensured proper handling of edge cases in use spot data, including unique IDs and finite positions.

docs/architecture/tech_debt_and_optimizations.md

@@ -77,6 +77,9 @@ This document tracks known technical debt, optimization opportunities, and minor
 | 65  | **Large custom prop switches need state parity with native buttons** — a drawn 64 × 34 px switch inside a full-row `Button` replaces the stock small `CheckButton` icon. | Low | Planned | The proposed `PropSettingsToggleRow` should keep native focus, keyboard activation, disabled state, and one `toggled` emission per press; its child labels must ignore pointer input. A compact depth cue lives inside each choice button, while the stage remains the live preview. See `docs/specs/prop_settings_card_refinement.md`. (2026-10-09) |
 | 66  | **Stage selection panels duplicate layout and visual rules** — the prop card owns its own shell sizing, choice styles, and `stage_prop_settings` tokens, making later inspector cards prone to drift. | Low | Planned | Promote the current prop card to a small shared Stage inspector shell, choice group, and toggle row with `stage_panels` theme tokens. Keep domain handlers in `SandboxStage`; preserve the existing prop role schema. During migration, resolve old prop tokens as fallback only temporarily and remove duplicate reads once the prop card uses the shared controls. See `docs/specs/stage_panel_ui_system.md`. (2026-10-09) |
 | 67  | **SandboxStage controller is too large for comfortable Godot IDE editing** — stage UI, terrain painting, document workflow, runtime rules, and speech coordination shared one roughly 7,600-line script. | High | In Progress | Approved slices 1–16 extracted reusable stage components and reduced `sandbox_stage.gd` to 5,009 lines (about 34%); the below-3,800-line target remains unmet by 1,209 lines. Root input/selection, authored queue/rule writes, recovery application, and save/commit ordering remain coordinated there. Root `--check-only` parse passes; behavior and in-editor responsiveness checks are pending. See `docs/specs/sandbox_stage_composition_refactor.md`. (2026-10-10) |
+| 68  | **Use preview cannot predict all prior rules or moving props** — DIRECT can see the current actor and prop plus a limited deterministic queue prefix, but reactive rules and rigid-body motion may change either before a pending Use action runs. | Low | Planned | Phase 17b displays an amber conditional preview when the future pose is uncertain and always recalculates reach during PLAY. One bounded target-movement replan handles ordinary drift without freezing physics. A future predictive timeline may improve authoring accuracy, but must not change persistent prop/spot IDs or claim certainty for simulated rule consequences. See `docs/specs/phase_17b_use_spots.md`. (2026-10-10) |
+| 69  | **Contact entry alone can miss a stickman hitting a fixed prop** — grounded locomotion stops at a shape-sweep safe fraction, sometimes before `body_entered` fires; resting contacts can also chatter after pause or quick separation. | Medium | Planned | Phase 17c routes identified blocking-prop sweep hits and actual body contacts through one relative approach-speed scorer and pair gate. Collapse multiple stickman limbs into one rig/prop pair, require separation/rearm plus a short cooldown, and clear baselines at PLAY/reset boundaries. Keep existing collision-rule dispatch independent. See `docs/specs/phase_17c_impact_wobble.md`. (2026-10-13) |
+| 70  | **Impact strength is initially speed based while prop mass is preset based** — material presets set `RigidBody2D.mass`, but fixed props are frozen and mass is not a child-facing setting. | Low | Planned | Keep the Phase 17c Wobble boolean and visual-only response independent of mass. Centralize impact scoring so a future editable-mass or impulse design can be evaluated without altering the Stage switch or migrating old scene choices. Do not infer a physical impulse from a frozen prop's preset mass; verify any future mass effect separately. See `docs/specs/phase_17c_impact_wobble.md`. (2026-10-13) |
 
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@@ -160,5 +163,7 @@ This document tracks known technical debt, optimization opportunities, and minor
 | 2026-10-09 | Proposed Stage selection panel UI system drafted for user approval (`docs/specs/stage_panel_ui_system.md`). The current prop card is the reference; a shared shell, choice group, toggle row, and theme tokens support later Stage inspectors. Logged #66 for duplicated panel presentation. No implementation code changed. |
 | 2026-10-10 | Sandbox Stage composition refactor specified for developer handoff (`docs/specs/sandbox_stage_composition_refactor.md`). Defines state ownership, explicit component APIs, compatibility facades, and an ordered migration beginning with spatial indexing and terrain painting. Logged #67; implementation followed in the entries below. |
 | 2026-10-10 | Sandbox Stage composition refactor slices 1–16 implemented (`docs/specs/sandbox_stage_composition_refactor.md`): extracted spatial indexing, terrain painting, stage chrome and views, document/scene adapters, run/director/rule/action/speech sessions, asset browsing, theme loading, and target capture. `sandbox_stage.gd` is 5,009 lines, about 34% smaller than the approximate 7,600-line baseline; the below-3,800-line target remains open. Godot 4.7.1 root `--check-only` parse passes. No behavior tests or in-editor checks were run; #67 remains In Progress. |
+| 2026-10-10 | Phase 17b Use spots implemented from the approved architecture/UI specs (`docs/specs/phase_17b_use_spots.md`, `docs/specs/phase_17b_use_spots_ui.md`). Instance-local numbered spots persist in `.scene` v1.3; Use requires empty hands, targets keep normal physics with one bounded approach replan, and reach stays grounded. `prop_used` fires only after hand contact; missing references remain repairable after save/load. Phase 17b suite passes 27/27, Phase 17a regression passes 46/46, and edited scripts parse; ready for in-editor user verification. Logged #68 for conditional preview of earlier rules/moving physics; #12, #19, #24, and #67 already cover AABB selection, popup host visibility, session rule IDs, and root controller size. |
+| 2026-10-13 | Phase 17c Impact wobble architecture specification drafted for final user sign-off (`docs/specs/phase_17c_impact_wobble.md`). A placed prop's saved boolean controls a visual-only wobble in PLAY and a brief EDIT preview. Contact entry plus identified stickman blocking sweeps feed a shared approach-speed gate, including ragdolls and both members of a prop-prop hit. Mass stays independent of the switch, with impact scoring isolated for future mass or impulse work. Scene version advances to 1.4 with older scenes defaulting Off. Logged #69–#70. No implementation code changed. |
 
 _End of Log_