feat: prepared buffers

[Julusian]

The aim of this is to better support users who want to do rapid drawing of the same buffers, such as to achieving flashing or gif behaviour.

This is a performance optimisation by allowing them to 'prepare' a draw, which does all the buffer preparation and jpeg encoding necessary, and then repeatedly send the draw when wanted much cheaper than before.

The prepared buffer can be optionally made json safe, where the buffers will be encoded as a string at the cost of requiring it to be decoded each time it is drawn

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 37.75510% with 61 lines in your changes missing coverage. Please review.

Project coverage is 33.55%. Comparing base (58b8994) to head (f8af9ed).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ckages/core/src/services/lcdSegmentDisplay/plus.ts	14.28%	11 Missing and 1 partial ⚠️
...ges/core/src/services/buttonsLcdDisplay/default.ts	52.17%	11 Missing ⚠️
packages/core/src/models/base.ts	9.09%	9 Missing and 1 partial ⚠️
packages/core/src/proxy.ts	0.00%	8 Missing ⚠️
packages/tcp/src/index.ts	0.00%	6 Missing ⚠️
packages/core/src/preparedBuffer.ts	79.16%	5 Missing ⚠️
...ckages/core/src/services/buttonsLcdDisplay/fake.ts	0.00%	4 Missing ⚠️
packages/webhid/src/index.ts	0.00%	3 Missing ⚠️
...ackages/core/src/services/lcdSegmentDisplay/neo.ts	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #102      +/-   ##
==========================================
+ Coverage   33.38%   33.55%   +0.17%     
==========================================
  Files          55       56       +1     
  Lines        1839     1925      +86     
  Branches      261      277      +16     
==========================================
+ Hits          614      646      +32     
- Misses       1135     1187      +52     
- Partials       90       92       +2     

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[Copilot]

Pull Request Overview

This PR adds support for preparing and reusing pre-encoded buffer operations to speed up repeated drawing on StreamDeck devices.

• Introduce a PreparedBuffer abstraction with JSON‐safe wrapping/unwrapping
• Extend the StreamDeck interface with prepareFill* methods and a sendPreparedBuffer operation
• Refactor LCD and button services to produce and consume prepared buffers

Reviewed Changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 5 comments.

File	Description
packages/core/src/preparedBuffer.ts	Define PreparedBuffer type and wrapBufferToPreparedBuffer/unwrapPreparedBufferToBuffer utilities
packages/core/src/types.ts	Add sendPreparedBuffer and prepareFillKey/Panel/LcdRegionBuffer signatures to StreamDeck
packages/core/src/services/buttonsLcdDisplay/default.ts	Refactor default button LCD service to support buffer preparation and JSON‐safe wrapping

Comments suppressed due to low confidence (1)

packages/core/src/preparedBuffer.ts:1

• Add unit tests for wrapBufferToPreparedBuffer and unwrapPreparedBufferToBuffer to verify correct encoding/decoding behavior and error conditions.

import type { DeviceModelId } from './id.js'