fix: Fix icon alignment in signature pages message section

[jpuri]

Description

Fix icon alignment in signature pages message section.

Related issues

Fixes: #28793

Manual testing steps

1. Go to test dapp
2. Submit permit
3. Check expand and copy icons position in message section

Screenshots/Recordings

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[pedronfigueiredo]

Visually, the copy and expand button do not seem to be center aligned in the screenshot above

[metamaskbot]

Builds ready [23bbc8d]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6
  • common: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1757 ± 68 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	1565	2040	1757	143	69
		domContentLoaded	1555	2027	1729	135	65
		load	1565	2044	1757	141	68
		domInteractive	23	102	48	23	11
		backgroundConnect	11	74	26	18	8
		firstReactRender	15	190	60	43	21
		getState	6	66	19	20	10
		initialActions	0	1	0	0	0
		loadScripts	1150	1538	1301	109	52
		setupStore	7	70	19	20	10
		uiStartup	1783	2955	2128	316	152

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: -12 Bytes (-0.00%)
• common: 0 Bytes (0.00%)