fix(ios-audio): activate session before voice joins (#38)

* fix(ios-audio): add voice join session coordinator

* fix(ios-audio): activate session before voice joins

* docs(ios-audio): align activation lifecycle comments

* fix(ios-audio): keep session active when already-in-channel

The 'already in channel' server response (code 0x0302) is treated as a
successful join by _onJoinChannel: the user stays in the channel and
local state is updated to reflect the joined target. But the underlying
voiceJoin call still raises BridgeError_ServerRejected, which the
joinVoiceChannelWithIosAudioSession helper used to interpret as a join
failure and deactivate the iOS audio session. Result: the UI shows the
user as joined while the audio session is dead and capture/playback
remain silent.

Add an isJoinSuccess predicate to the ordering helper. When the
predicate matches, the helper rethrows (so the caller can still run its
success-on-already-joined branch) without deactivating the session.
Wire _onJoinChannel to pass _isAlreadyInChannel as the predicate so the
0x0302 path keeps the session active.

Adds two regression tests covering the success-on-rethrow and the
predicate-false-still-deactivates paths.

* docs(security): regenerate license inventories

Cargo inventory: pick up chanora_resolver bump from 0.1.0 to
0.2.0-beta.1 so it matches the workspace; also adds a trailing newline
so 'cargo about generate' is idempotent in CI license-drift checks.

Flutter inventory: pick up flutter_local_notifications (+ platform
interfaces) and timezone pulled in by the prior notification
permission work.

docs/security/license-inventory.md

@@ -10967,3 +10967,4 @@ cargo about generate --output-file docs/security/license-inventory.html about.hb
 
 This artefact supports the DEC-012 legal review handoff at
 `docs/governance/legal-review-readiness.md`.
+