style: Update font weights for balance, price and other headers

[amandaye0h]

Description

This updates the font weight for the headers on these pages: home, token details and NFT details. It refines the visual language of the product.

Link to relevant designs

Related issues

Fixes: None

Manual testing steps

1. Open MetaMask
2. Go to token details
3. Go to NFT details

Screenshots/Recordings

Before

After

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.

[metamaskbot]

Builds ready [0feb860]

• builds: chrome, firefox
• builds (flask): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• bundle size: Bundle Size Stats
• user-actions-benchmark: User Actions Stats
• storybook: Storybook
• typescript migration: Dashboard
• all CircleCI artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7, 8
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
  • ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
  • content-script: 0
  • offscreen: 0

UI Startup Metrics (1200 ± 52 ms)

Platform	BuildType	Page	Metric	Mean (ms)	Min (ms)	Max (ms)	Std Dev (ms)	P 75 (ms)	P 95 (ms)
Chrome	Browserify	Home	uiStartup	1200	1111	1381	52	1233	1292
			load	1054	961	1211	48	1131	993
			domContentLoaded	1048	955	1206	48	1206	992
			domInteractive	16	13	33	5	16	29
			firstPaint	866	132	1211	358	229	993
			backgroundConnect	11	7	80	9	9	10
			firstReactRender	18	14	47	5	18	31
			getState	11	4	41	7	6	7
			initialActions	0	0	1	0	0	1
			loadScripts	797	707	938	47	830	882
			setupStore	7	5	23	2	7	8
	Webpack	Home	uiStartup	2070	1638	2482	200	2212	2307
			load	1606	1260	2008	155	1722	1811
			domContentLoaded	1601	1256	1996	154	1718	1806
			domInteractive	17	12	66	12	14	55
			firstPaint	161	65	323	57	237	73
			backgroundConnect	30	11	351	35	33	59
			firstReactRender	180	54	350	109	78	91
			getState	10	3	23	4	8	9
			initialActions	5	1	230	23	3	4
			loadScripts	1592	1253	1973	153	1715	1794
			setupStore	28	6	303	57	23	9
Firefox	Browserify	Home	uiStartup	1410	1171	1916	166	1472	1826
			load	1263	1054	1770	153	1322	1651
			domContentLoaded	1263	1054	1770	153	1322	1651
			domInteractive	98	37	172	25	88	96
			firstPaint	NaN	NaN	NaN	NaN	NaN	NaN
			backgroundConnect	26	16	136	15	26	48
			firstReactRender	22	18	31	3	25	28
			getState	8	3	49	5	7	9
			initialActions	0	0	1	0	0	1
			loadScripts	1238	1037	1746	150	1299	1617
			setupStore	7	4	21	3	6	8
	Webpack	Home	uiStartup	1512	1323	1949	149	1577	1868
			load	1304	1142	1743	139	1358	1646
			domContentLoaded	1304	1142	1742	139	1358	1645
			domInteractive	91	36	162	23	90	97
			firstPaint	NaN	NaN	NaN	NaN	NaN	NaN
			backgroundConnect	25	17	55	7	26	46
			firstReactRender	36	29	53	6	39	47
			getState	9	3	30	6	7	8
			initialActions	1	0	2	1	1	1
			loadScripts	1281	1120	1716	138	1339	1621
			setupStore	8	4	27	3	8	9

Bundle size diffs

• background: 0 Bytes (0%)
• ui: 33 Bytes (0%)
• common: 0 Bytes (0%)

[vinnyhoward]

Looks great!