fix(touch): reveal Home cards from the left during minimization

[doodlewind]

A Home-bar swipe during the preceding app's minimization could reuse that app's shrinking icon pose, making Photos grow from its Home icon. Prepare a fresh reveal off the left edge at card size. Preserve visible poses only when catching an already prepared, withdrawing left-edge peek.

Validation:

• The new regression fails on the previous code: the starting card's right edge is inside the screen instead of left of it.
• Model coverage spans iPod 320×480 and E7 360×640 / 640×360, 30/60 Hz, dock / Photos / second-page apps, and return-to-Home delays from zero to two seconds.
• Mounted E7 tests send packed touch input through the guest and verify Photos enters from the left at fixed card scale during an interrupted minimization. Existing cancellation/recatch, icon launch, MRU, direction-lock and paging checks remain covered.
• bun run check:touch: typecheck, 48 Bun tests / 7,228 assertions, and 7 Python protocol tests pass.

Native E7 validation:

• Installed a 60 Hz profiling SIS and replayed Today → Home → Photos → Home → a new bottom-bar swipe 200 ms after minimization release. The trace contains all 1,801 frames, 80 input points, viewport=360×640, and inactive_frames=0.
• Inspected the native framebuffer after reveal release: Photos appears as a card-size strip from the left edge while its Home icon remains in place. It does not expand from the icon.
• Profile SIS 0.2.33 SHA-256: 09abb482a216e47c9d91beffab4ed0b585261641f930961d768a082fd916d0f9.
• Installed and launched normal SIS 0.2.34 as p2039 after MTP byte-for-byte readback and CODA package verification. Replay input is empty and the temporary wake helper has been uninstalled.
• Normal SIS 0.2.34 SHA-256: 0e62191452ae600d5fce2e68ac35c8436d63692373498b4ff7804abd98c5df04; tracing disabled, 60 Hz, VFPv2. Guest SHA-256: 132a49a7c2bef51ab4b6ee86e81b281c71da2ebe9567cdd617b5d3fdc1f0a423.
• Both builds use PocketJS 2453d60c and the same optimized native core as the preceding E7 deployment. Shared navigation is tested at iPod dimensions; this run's native device validation is E7, not iPod.

Reproduce from the PocketJS runtime checkout:

PATH="$HOME/.cargo/bin:$PATH" bun tools/symbian.ts build app \
  --manifest "$SHELL_CHECKOUT/shells/touch/pocket.json" \
  --project-root "$SHELL_CHECKOUT/shells/touch" \
  --outdir .pocket-build/validation/touch-home-reveal/release \
  --sis-version 0.2.34 --frame-rate 60

For inspection, build with --perf-trace and use the shell's CODA profile command with a packed contact sequence that returns Photos Home and starts a bottom-bar reveal 200 ms later. Replay checks native guest dispatch and rendering; physical touch delivery remains a manual acceptance boundary. Per-run packages, traces and screenshots stay in ignored .pocket-build/validation/touch/home-reveal-left/ and the upstream build checkout's validation directory.

Stacked on #18; no runtime or vendor pin changes.