Add hydration fallbacks and refactor Navigation

[Oksamies]

• #1158 👈
• #1156
• #1155
• #1154
• #1153
• #1152
• #1151
• #1148
• #1143
• #1142
• #1141
• #1137
• #1136
• #1135
• #1134
• #1133
• #1132
• #1131
• #1129 : 1 other dependent PR (#1169 )
• master

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[Oksamies]

Merge activity

• Aug 26, 6:36 AM EDT: @Oksamies started a stack merge that includes this pull request via Graphite.
• Aug 26, 6:58 AM EDT: Graphite couldn't merge this pull request because a downstack PR #1133 failed to merge.
• Aug 26, 8:09 AM EDT: @Oksamies started a stack merge that includes this pull request via Graphite.
• Aug 26, 8:17 AM EDT: Graphite couldn't merge this pull request because a downstack PR #1135 failed to merge.