fix: preserve theme_id across state machine transitions

[theashraf]

Fixes bug where theme_id was being reset when entering new states in the state machine.

Root cause: config.theme_id and active_theme_id were not kept in sync. When set_theme() was called, only active_theme_id was updated. During state transitions, the empty config.theme_id was used to create new configs, causing theme reset.

Changes:

• Sync config.theme_id with active_theme_id in set_theme()
• Clear both in reset_theme() and when clearing themes
• Preserve theme_id in state transition config creation
• Re-apply theme after load_animation() to handle cases where renderer was cleared
• Remove redundant config.theme_id assignment in set_config()

[changeset-bot]

⚠️ No Changeset found

Latest commit: 1a89a7c

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[github-actions]

📊 Benchmark Results

dotlottie-rs

Benchmark	Change	Confidence Interval	Status
load_animation_data	+4.09%	[+3.45%, +4.64%]	⚡ Slight change
set_theme	+0.06%	[-0.14%, +0.38%]	✅ No change
animation_loop_no_frame_interpolation	-0.11%	[-2.79%, +2.61%]	✅ No change
state_machine_load	-0.23%	[-0.57%, +0.02%]	✅ No change
load_dotlottie_data	-0.96%	[-1.29%, -0.64%]	✅ No change
load_animation_path	-1.05%	[-1.38%, -0.72%]	✅ No change
animation_loop_frame_interpolation	-1.35%	[-3.73%, +1.46%]	✅ No change
state_machine_load_data	-1.75%	[-5.08%, +0.91%]	✅ No change

How to interpret these results

• Change: Estimated performance difference (negative = faster, positive = slower)
• Confidence Interval: 95% confidence bounds for the change
• Regression: Lower bound > +5% (confidently slower)
• Improvement: Upper bound < -5% (confidently faster)

Criterion uses statistical analysis to account for noise and provide reliable comparisons.