BitBox02 firmware

Merge remote-tracking branch 'agent/benma-agent/validate-backup-seed-length'

Merge remote-tracking branch 'agent/benma-agent/reject-oversized-policy-keys'

backup: validate decoded seed length

Reject backup data whose declared seed length exceeds the fixed
32-byte seed field. This prevents malformed SD-card backups from
triggering an out-of-bounds panic while listing backups.

Add a regression test with an otherwise valid protobuf and recomputed
checksum.

Tests:
- `cargo test --manifest-path src/rust/Cargo.toml --all-features -- --test-threads 1`
- `./scripts/dev_exec.sh make run-unit-tests`

btc: reject oversized policy keys

Reject policy keys whose rendered confirmation exceeds the UI label limit.
This prevents registration from approving a key that cannot be displayed in full.

Add boundary coverage for a 640-byte key and rejection at 641 bytes.

bb03 ui: replace long touch with slide to confirm

replaces hold to confirm (long touch) with
slide to confirm and removed long touch for BB03

bb03 UI: slide to confirm

Implement slide to confirm UI component for
confirming transactions and sensitive operations

Delete render_slide_confirm.rs

u2f: fix refresh screen

u2f: fix nudge screen

Fix GroundedCell result lifetime

Read the confirmation result before clearing CONFIRM_STATE.
The result reference points into GroundedCell storage, so clearing the
state first invalidates it before result.is_ok() reads it.

This keeps the poll contract: publish the completed result, clear the task
state, and report completion. It also matches rust_workflow_unlock_poll().

rust: initialize C output buffers

Rust slices require every byte in their backing storage to be initialized,
even when a function only intends to overwrite the bytes. Several C callers
passed uninitialized output buffers through BytesMut, and SHA/HMAC created
mutable slices directly from such pointers. This was formal UB and could
allow optimizer-dependent behavior.

In practice, these paths only wrote their outputs before C consumed them, and
current builds emitted the expected stores. No secret disclosure, corrupted
output, or control-flow impact was observed. This is hardening rather than a
fix for a demonstrated exploit.

Initialize C storage before constructing BytesMut. Keep output-only helpers on
raw pointers so they can legally initialize storage, and document the FFI
invariant. Raw-pointer APIs that already used direct stores remain valid.

factorysetup: validate RTT message length

Reject RTT frames whose declared payload exceeds the bytes returned by the transport.

This prevents copying uninitialized stack data into factory commands when a frame is partial.

memory: initialize BLE random buffer

btc: limit Miniscript encoding depth

Reject WSH policies and Taproot leaves that exceed the firmware-specific recursive encoding limit.

Cover the boundary and known deep-policy shape with tests.

eth: limit EIP-712 recursion depth

Reject schemas and values whose recursive struct or array traversal
exceeds a bounded depth. Validate type roots before callbacks and
cover the boundaries with tests.

py: extract bootloader connection

Move the USB bootloader fallback into a nested helper to satisfy
pylint's return-count limit without changing behavior.

prepare v9.26.5

Set v9.26.5 and move its release fixes into a dedicated changelog section.

Keep BitBoxSync documented as unreleased.

api: disable BitBoxSync by default

Gate the BitBoxSync API behind a disabled-by-default Cargo feature while API changes are pending.

Requests now return the standard disabled error unless the feature is explicitly enabled.

rust: bound executor queue

Replace the unbounded concurrent queue with a fixed-capacity ring buffer
storing 16 Runnable slots inline. Scheduling no longer allocates, including
when wakers run in interrupt context.

Limit active tasks to the queue capacity so exhaustion is reported from
spawn rather than from a waker. Protect queue access with critical sections
because wakers and the main loop may access it concurrently.

The executor currently has three normally serialized root-task sources, so
16 slots leave room for future concurrency and consume 64 bytes on the
32-bit firmware target.

Cover repeated slot reuse and enforcement of the task limit. Remove the
now-unused concurrent-queue dependency.

rust: use static no-op waker

The polling executor ignores wake notifications and is polled on every
main-loop iteration. Use core's static no-op waker so ISR callbacks cannot
free an Arc while the heap allocator is active.

Remove the now-unused heap-backed waker helper.

usb: block HWW during U2F workflows

Track detached U2F workflow lifetimes independently of their public
result state. Return HWW_RSP_BUSY before starting an HWW request while a
U2F workflow can still own the shared UI.

This prevents HWW session reset and cancellation paths from invalidating
live U2F UI objects. Add regressions for the lifetime guard and busy
response.

Fix LVGL transition style clearing

Wrap the transition style setter around LvStyleTransition so callers use
the safe wrapper instead of raw descriptors.

Remove the local transition style property when None is passed, matching
the behavior of other optional style setters.

ui: keep frame during async processing

Async operations can leave the screen stack temporarily empty between
two UI calls. This caused the waiting screen to flash, unlike the old
synchronous securechip behavior.

Treat locally processing USB requests as active UI work and keep the last
frame when no component is stacked. Host waits, screensavers, and explicit
components continue to render normally.

Warn before truncated value displays

Show the existing large-value warning before value confirmation bodies that exceed the UI label limit.

Apply it to shared message verification, Ethereum transaction and typed-data values, and BTC policy name/policy displays.

releases: add v9.26.2, v9.26.3 and v9.26.4

eth: loosen EIP-712 identifier validation

Allow ':' in EIP-712 type names used by some dapps as a namespace
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Co-Authored-By: Tomas Vrba <vrba.tomas@pm.me>