feat: Add footers to Snap home pages

[FrederikBolding]

Description

Allow Footer in Snap home pages, this works in the same way that the new Snap dialogs does, with the exception that default footers are turned off (e.g. a cancel button is not added automatically).

Also fixes a few padding problems with home pages.

Related issues

Closes: #25417

Manual testing steps

1. Create a Snap that uses <Footer> in onHomePage
2. See that the footer now shows up
3. Install any existing Snap that doesn't use Footer
4. See that no footer is shown

Screenshots/Recordings

home-page-footers.mp4

[metamaskbot]

Builds ready [794c849]

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

Page Load Metrics (382 ± 334 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	91	240	122	33	16
		domContentLoaded	12	68	31	15	7
		load	59	2363	382	696	334
		domInteractive	12	68	31	15	7

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: 104 Bytes (0.00%)
• common: 0 Bytes (0.00%)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.12%. Comparing base (2d63c0e) to head (794c849).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #26463   +/-   ##
========================================
  Coverage    70.12%   70.12%           
========================================
  Files         1428     1428           
  Lines        50089    50089           
  Branches     13894    13894           
========================================
  Hits         35120    35120           
  Misses       14969    14969           

☔ View full report in Codecov by Sentry.
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The merge-base changed after approval.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[metamaskbot]

Builds ready [04b720d]

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

Page Load Metrics (268 ± 278 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	67	141	107	21	10
		domContentLoaded	10	58	30	13	6
		load	45	2174	268	579	278
		domInteractive	10	58	30	13	6

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: 90 Bytes (0.00%)
• common: 0 Bytes (0.00%)